WO2016019851A1

WO2016019851A1 - Switchover implementation method, station and system

Info

Publication number: WO2016019851A1
Application number: PCT/CN2015/086034
Authority: WO
Inventors: 廖锦秋; 欧斯思
Original assignee: 华为技术有限公司
Priority date: 2014-08-06
Filing date: 2015-08-04
Publication date: 2016-02-11
Also published as: CN104158586A; CN104158586B

Abstract

Provided in an embodiment of the present invention are a switchover implementation method, station and system. The switchover implementation method comprises: a station detects a service data stream abnormality to determine whether an upstream line of the station is abnormal; if the station determines that the upstream line of the station is abnormal, then the station performs a protection switchover locally, and neither a first data frame transmitted to a downstream station during abnormality detection nor a second data frame transmitted to the downstream station after the abnormality detection will trigger a protection switchover performed by the downstream station, so that the abnormality of the upstream line will not spread, preventing an unnecessary switchover performed by the downstream station, and thus avoiding an increase in service signal recovery time resulting from an unnecessary switchover; in addition, a station functioning properly on the upstream line will not perform a protection switchover, so that maintenance personnel can quickly identify a station performing a protection switchover as a station with transmission abnormalities on the upstream line, thus quickly locating a malfunctioning station and simplifying network maintenance.

Description

Switching implementation method, site and system

This application claims priority to Chinese Patent Application No. 201410385026.2, filed on Aug. 6, 2014, entitled "A Switching Implementation Method, Site and System", the entire contents of which are incorporated herein by reference. In the application.

Technical field

The present invention relates to the field of optical fiber network communication, and in particular, to a switching implementation method, a station, and a system.

Background technique

Optical Transport Network (OTN) is an important standard for optical transmission equipment. The user equipment and the user equipment are connected by an optical transport network, that is, the user equipments connected through the optical transport network can transmit service signals to each other. As shown in FIG. 1 , the user equipment 101 sends a service signal to the user equipment 102 as an example. The user equipment 101 is a client service sender, and the user equipment 102 is a client service receiver. The optical transport network includes a plurality of stations for processing optical transport network signals, and the standard signal format of the optical transport network processed in each station is an ODUi signal (i=0, 1, 2, 3, 4, 2e, 3e, flex) (ODU; Optical Channel Data Unit), as shown in FIG. 1, the station 103 maps the service signal sent by the user equipment 101 into an ODUi signal, and the station 105 demaps the ODUi signal into a service signal. To be sent to the user device 102. Wherein, the ODUi signal exists only in each station, and the ODUi signal is converted into an OTUk signal (k=1, 2, 3, 4, 2e, 3e) when transmitted between stations (OTU: Optical Transform Unit, optical conversion Unit) In general, multiple ODUi signals are multiplexed into one OTUk for transmission to improve transmission efficiency. Both ODUi signals and OTUk signals are optical transmission network signals.

With the development of optical communication technology, thousands of pieces of information are gathered in one fiber. Once the fiber fails, it will cause great adverse effects. Therefore, each device in the optical transmission network needs to have good self. In this context, SDH (Synchronous Digital Hierarchy) is widely used. A very important feature of SDH technology is its material line protection capability. The multiplex section ring network protection is widely used at present. The high-efficiency material line protection technology realizes the continuous application of the optical transmission network in less than 50ms through the communication channel performance monitoring of the multiplex section and the automatic bridge protection control, and there is no interruption of the service signal.

The specific structure inside each station is described in detail in conjunction with FIG. 2; the station 103 connected to the user equipment 101 for transmitting a service signal specifically includes two service data streams for mapping service signals into low-order ODUi. The tributary board T10, wherein the tributary board 1031 is a protection board of the tributary board 1032, the tributary board 1031 and the tributary board 1032 are all connected with the user equipment 101, and the upstream line connected with the tributary board 1032 is mainly used. The upstream line, the upstream line connected to the tributary board 1301, protects the upstream line. Within the site 103, the tributary board 1031 and the tributary board 1032 both send the service data stream to the cross board 1033, and the cross board 1033 selects the service data stream at the same time according to the principle of concurrent preference, that is, double-selection. Specifically, if the primary upstream line is normal, the cross board 1033 sends the data stream sent by the tributary board 1032 to the circuit board N. If the primary upstream line is abnormal, the cross board 1033 sends the data sent by the tributary board 1031. The stream is sent to the circuit board N; the circuit board N encapsulates the service data stream of the low-order ODUi into a high-order OTUk service data stream to transmit the high-order OTUk service data stream to the station 104.

As shown in FIG. 2, if an abnormality occurs in the line between the tributary board 1032 and the user equipment 101, the station 103 transmits the service data stream through the line between the tributary board 1031 and the user equipment 101 to complete the normal operation. 1+1 protection. When the tributary board T maps the service signal to the service data stream of the low-order ODUi, the service signal abnormality will cause the abnormality of the low-order ODUi. In the period during which the tributary board T performs the abnormality detection, the abnormal low-order ODUi will From station 103 to station 104, station 104 detects an abnormal low-order ODUi, performs protection switching within station 104, but the line between station 103 and station 104 is normal and should not perform protection switching at station 104.

It can be seen from the above that the fault within the protection range triggers the protection switching, but the fault outside the protection range also causes the protection switching, and the line fault cannot be isolated in the failed protection switching domain. The fault of the line faults causes the downstream stations that do not need to be switched to be switched, which causes unnecessary protection switching, which causes the data transmission to lag, resulting in a longer service signal recovery time. The faulty site cannot be quickly located, and network operation and maintenance is difficult.

Summary of the invention

The embodiment of the invention provides a switching implementation method, a site and a system, which can avoid the reverse switching of the downstream site.

A first aspect of the embodiments of the present invention provides a method for implementing a switching, in which a plurality of sites are connected in series between a client service sending end and a client service receiving end, and the method includes:

The station detects whether the upstream line of the station is abnormal;

During the abnormality detection, if the station determines that the first data frame does not satisfy the preset condition, the station modifies the first data frame to enable the modified to be sent to the downstream site of the station. The first data frame is used to indicate that the downstream station does not perform protection switching, where the first data frame is a data frame sent by the station to the downstream station during the abnormality detection;

If the station detects that the upstream line of the station is abnormal according to the first data frame, the station performs protection switching;

Modifying, by the station, the second data frame, so that the modified second data frame sent to the downstream station is used to indicate that the downstream station does not perform protection switching, where the second data frame is A data frame received by the station through the abnormal upstream line and sent to the downstream station after the abnormality detection period.

With reference to the first aspect of the embodiments of the present invention, in a first implementation manner of the first aspect of the embodiments of the present invention,

If the upstream line of the site is connected to the client service sender, the method further includes: before the site determines whether the upstream line of the site is abnormal, the method further includes:

Receiving, by the station, a service signal sent by the sending end of the client service;

The station maps the service signal to a service data stream, where the service data stream includes the first data frame and the second data frame;

If the upstream line of the station is connected to the upstream station of the station, the method further includes: before the station determines whether the upstream line of the station is abnormal, the method further includes:

The station receives a service data stream sent by the upstream station, where the service data stream includes the first data frame and the second data frame.

With reference to the first aspect of the embodiment of the present invention or the first implementation manner of the first aspect of the embodiment of the present invention, in a second implementation manner of the first aspect of the embodiment of the present invention,

Whether the station determines whether the upstream line of the station is abnormal includes:

Determining, by the station, whether the coding mode of the first data frame is in a preset coding mode, where the preset coding mode is the service signal or the service data flow received by the station through the normal uplink line. Coding method

If yes, the station determines that the upstream line is normal;

If not, the station determines that the upstream line is abnormal.

With reference to the first aspect of the embodiment of the present invention or the first implementation manner of the first aspect of the embodiment of the present invention, in a third implementation manner of the first aspect of the embodiment of the present invention,

Performing, by the station, a frame header search on the first data frame;

Determining, by the station, whether the frame header can be continuously searched within a preset time period;

If yes, the station determines that the upstream line of the station is normal;

If not, the station determines that the upstream line of the station is abnormal.

With reference to the first aspect of the embodiments of the present invention or the first implementation manner of the first aspect of the embodiments of the present invention, in a fourth implementation manner of the first aspect of the embodiments of the present invention,

Before the determining whether the upstream line of the site is abnormal, the method further includes:

The station determines a clock frequency offset of the first data frame.

With reference to the fourth implementation manner of the first aspect of the embodiment of the present invention, in a fifth implementation manner of the first aspect of the embodiment of the present invention,

Determining, by the station, whether a clock frequency offset of the first data frame is greater than or equal to a threshold;

If yes, the station determines that the upstream line of the station is abnormal;

If not, the station determines that the upstream line of the station is normal.

With reference to the fourth implementation manner of the first aspect of the embodiment of the present invention, in a sixth implementation manner of the first aspect of the embodiment of the present invention,

During the abnormality detection, if the station determines that the first data frame does not meet the preset condition, the modification of the first data frame by the station includes:

During the abnormality detection of the station, the station determines whether a clock frequency offset of the first data frame is within a preset range, wherein the current clock frequency offset located within the preset range is used to indicate The downstream site does not perform protection switching;

If the station determines that the clock frequency offset of the first data frame is not within the preset range, the station determines that the first data frame does not satisfy the preset condition;

The station modifies a clock frequency offset of the first data frame, so that a clock offset of the modified first data frame is within the preset range.

With reference to the first aspect of the embodiments of the present invention or the first implementation manner of the first aspect of the embodiments of the present invention, in a seventh implementation manner of the first aspect of the embodiments of the present disclosure,

The method further includes: after the abnormality detection, after the station determines that the upstream line of the station is abnormal, the method further includes:

The station generates a clock by self-oscillation;

Determining, by the station, that the clock generated by the self-oscillation of the station is a target clock, where the target clock is used to indicate that the downstream station does not perform protection switching;

Modifying the second data frame by the station includes:

The station replaces the clock of the second data frame with the target clock.

With reference to the first aspect of the embodiments of the present invention or the first implementation manner of the first aspect of the embodiments of the present invention, in an eighth implementation manner of the first aspect of the embodiments of the present invention,

The station is self-oscillated to generate a periodic frame header;

Determining, by the station, the frame header of the static vibration of the station is a target frame header, where the target frame header is used to indicate that the downstream site does not perform protection switching;

Modifying the second data frame by the station includes:

The station replaces a frame header of the second data frame with the target frame header.

With reference to the first aspect of the embodiments of the present invention or the first implementation manner of the first aspect of the embodiments of the present invention, in a ninth implementation manner of the first aspect of the embodiments of the present invention,

If the site detects that the cost of the second data frame is set with the indication information for indicating the switching of the downstream station, the site modifies the switching indication information, so that the modified switching indication is modified. The information is used to indicate that the downstream site does not perform protection switching;

Determining, by the site, that the modified overhead of the switching indication information is a target overhead;

Modifying the second data frame by the station includes:

The station replaces the overhead of the second data frame with the target overhead.

A second aspect of the embodiments of the present invention provides a site, including:

a detecting unit, configured to detect whether an upstream line of the station is abnormal;

a first modifying unit, configured to modify the first data frame to ensure that the downlink data sent to the site is modified after determining that the first data frame does not satisfy the preset condition during the abnormality detection The first data frame is used to indicate that the downstream station does not perform protection switching, where the first data frame is a data frame sent by the station to the downstream station during the abnormality detection;

a first determining unit, configured to perform protection switching if an upstream line abnormality of the station is detected according to the first data frame;

a second modifying unit, configured to modify the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream site does not perform protection switching, where The two data frames are data frames received by the station through the abnormal upstream line and sent to the downstream station after the abnormality detection period.

With reference to the second aspect of the embodiments of the present invention, in a first implementation manner of the second aspect of the embodiment of the present invention,

The site also includes:

a first receiving unit, configured to receive a service signal sent by the client service sending end if the upstream line of the station is connected to the client service sending end;

a second determining unit, configured to map the service signal into a service data stream, where the service data stream includes the first data frame and the second data frame;

a second receiving unit, configured to receive, when the upstream line of the station is connected to an upstream station of the station, a service data flow sent by the upstream station, where the service data flow includes the first data frame and The second data frame.

With reference to the second aspect of the embodiment of the present invention or the first implementation manner of the second aspect of the embodiment of the present invention, in a third implementation manner of the second aspect of the embodiment of the present invention,

The detecting unit includes:

a first determining module, configured to determine whether a coding mode of the first data frame is consistent with a preset coding mode, where the preset coding mode is the service signal or the received by the station by using the normal uplink line Describe the coding method of the service data stream;

a second determining module, configured to determine that the upstream line is normal if it is determined that the encoding manner of the first data frame conforms to a preset encoding manner;

And a third determining module, configured to determine that the upstream line is abnormal if it is determined that the encoding manner of the first data frame does not conform to the preset encoding manner.

With reference to the second aspect of the embodiment of the present invention or the first implementation manner of the second aspect of the embodiment of the present invention, in a fourth implementation manner of the second aspect of the embodiment of the present invention,

The detecting unit includes:

a fourth determining module, configured to perform a frame header search on the first data frame;

a fifth determining module, configured to determine whether the frame header can be continuously searched within a preset duration;

a sixth determining module, configured to determine that the upstream line of the station is normal if the frame header can be continuously searched within a preset duration;

The seventh determining module is configured to determine that the upstream line of the station is abnormal if the frame header cannot be continuously searched for a preset duration.

With reference to the second aspect of the embodiment of the present invention or the first implementation manner of the second aspect of the embodiment of the present invention, in a fifth implementation manner of the second aspect of the embodiment of the present invention,

The site also includes:

And a third determining unit, configured to determine a clock frequency offset of the first data frame.

With reference to the fifth implementation manner of the second aspect of the embodiment of the present invention, in a sixth implementation manner of the second aspect of the embodiment of the present invention,

The detecting unit includes:

An eighth determining module, configured to determine whether a clock frequency offset of the first data frame is greater than or equal to a threshold value;

a ninth determining module, configured to determine that an upstream line of the station is abnormal if a clock frequency offset of the first data frame is greater than or equal to a threshold value;

The tenth determining module is configured to determine that the upstream line of the station is normal if the clock frequency offset of the first data frame is less than a threshold.

With reference to the fifth implementation manner of the second aspect of the embodiment of the present invention, in a seventh implementation manner of the second aspect of the embodiment of the present invention,

The first modifying unit includes:

An eleventh determining module, configured to determine, during an abnormality detection of the station, whether a clock frequency offset of the first data frame is within a preset range, where the current time is within the preset range The clock frequency is used to indicate that the downstream station does not perform protection switching;

a twelfth determining module, configured to determine that the first data frame does not satisfy the preset condition if it is determined that a clock frequency offset of the first data frame is not within the preset range;

And a thirteenth determining module, configured to modify a clock frequency offset of the first data frame, so that a clock offset of the modified first data frame is within the preset range.

With reference to the second aspect of the embodiment of the present invention or the first implementation manner of the second aspect of the embodiment of the present invention, in an eighth implementation manner of the second aspect of the embodiment of the present invention,

The site also includes:

a first self-vibrating unit for generating a clock by self-oscillation;

a fourth determining unit, configured to determine that the clock generated by the self-oscillation of the station is a target clock, where the target clock is used to indicate that the downstream station does not perform protection switching;

The second modifying unit is configured to replace the clock of the second data frame with the target clock.

With reference to the second aspect of the embodiment of the present invention or the first implementation manner of the second aspect of the embodiment of the present invention, in a ninth implementation manner of the second aspect of the embodiment of the present invention,

The site also includes:

a second self-vibrating unit, configured to generate a periodic frame header by self-oscillation;

a fifth determining unit, configured to determine that the frame header of the static vibration of the station is a target frame header, where the target frame header is used to indicate that the downstream site does not perform protection switching;

The second modifying unit is configured to replace a frame header of the second data frame with the target frame header.

With reference to the second aspect of the embodiment of the present invention or the first implementation manner of the second aspect of the embodiment of the present invention, in the tenth implementation manner of the second aspect of the embodiment of the present invention,

The site also includes:

a sixth determining unit, configured to detect, in the overhead of the second data frame, that the switching indication information is used to indicate the switching of the downstream station, and modify the switching indication information, so that the modified switching The indication information is used to indicate that the downstream site does not perform protection switching;

a seventh determining unit, configured to determine that the overhead of the modified switching indication information is set as a target overhead;

The second modifying unit is configured to replace the overhead of the second data frame with the target overhead.

A second aspect of the embodiments of the present invention provides a system, including: for transmitting a service signal a client service sender and a client service receiver for receiving the service signal, and a plurality of the client service sender and the client service receiver are connected in series according to the second aspect of the present invention to the implementation of the present invention. The site described in the tenth implementation of the second aspect of the example.

An embodiment of the present invention provides a switching implementation method, a site, and a system. In the switching implementation method, a site performs an abnormality detection on a service data flow to determine whether an upstream line of the station is abnormal. And performing protection switching at the local station; during the abnormality detection, if the station determines that the first data frame does not satisfy the preset condition, the station modifies the first data frame to be sent to The modified first data frame of the downstream site of the site is used to indicate that the downstream site does not perform protection switching, and the site modifies the second data frame to enable the modification to be sent to the downstream site. The second data frame is used to indicate that the downstream station does not perform protection switching. The first data frame sent to the downstream station during the abnormality detection and the second data frame sent to the downstream station after the abnormality detection period are not triggered by the downstream station to perform protection switching, so that the upstream The abnormality of the line does not spread, so that the downstream site does not undergo erroneous switching, and the service signal recovery time becomes longer due to the erroneous switching of the downstream site. In this embodiment, the site where the upstream line does not fail does not occur. The protection switching enables the maintenance personnel to quickly determine that the site where the protection switching occurs is the site that sends the abnormality to the upstream line, and realizes the rapid location of the faulty site, which makes the network maintenance simple.

DRAWINGS

1 is a schematic structural diagram of an optical transmission network system in the prior art;

2 is a schematic diagram showing the working process of the optical transport network system in the prior art;

3 is a flow chart of steps of a preferred embodiment of a method for implementing switching according to an embodiment of the present invention;

4 is a flow chart of steps of another preferred embodiment of a method for implementing switching according to an embodiment of the present invention;

FIG. 5 is a flow chart of steps of another preferred embodiment of a method for implementing switching according to an embodiment of the present invention;

FIG. 6 is a flow chart of steps of another preferred embodiment of a method for implementing switching according to an embodiment of the present invention;

FIG. 7 is a flow chart of steps of another preferred embodiment of a method for implementing switching according to an embodiment of the present invention;

FIG. 8 is a flow chart of steps of another preferred embodiment of a method for implementing switching according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a preferred embodiment of a station according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of another preferred embodiment of a station according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of another preferred embodiment of a station according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of another preferred embodiment of a station according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of another preferred embodiment of a station according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of another preferred embodiment of a station according to an embodiment of the present invention.

detailed description

The embodiment of the invention provides a switching implementation method, which can effectively prevent erroneous switching.

As shown in FIG. 3, the switching implementation method shown in this embodiment includes:

301. The station detects whether an upstream line of the station is abnormal.

For a better understanding of the embodiments of the present invention, the specific structure of the optical transport network provided with the site is first described in detail:

As shown in FIG. 4, in this embodiment, a plurality of sites are connected in series between the client service sending end 401 and the client service receiving end 402. It is to be understood that FIG. 4 is a schematic diagram, and in this embodiment, The specific number of sites is not limited.

The specific structure is: the tributary board T of the station 403 connected to the client service sending end 401 is configured to map the service signal sent by the client service sending end 401 into a service data stream of the low-order ODUi, and the circuit board of the station N encapsulates the service data streams of the plurality of low-order ODUis into a high-order OTUk service data stream, and the high-order OTUk service data stream can be sent to the downstream station 404.

The circuit board N of the station 405 connected to the customer service receiving end 402 converts the high-order OTUk service data stream into the service data stream of the low-order ODUi, and the tributary board T of the station 405 sets the service data of the low-order ODUi. The stream is demapped into a service signal for transmission to the client service receiving end 402.

The station 403 for performing mapping processing on the service signal and the station 405 for performing demapping processing on the service data stream further include at least one OTUk service data stream for transmitting high order. The number of sites 404 is not limited.

It can be seen that in this embodiment, the site can be connected to the client service sending end through its upstream line, or can be connected to the upstream site.

Specifically, the device shown in FIG. 4 is 1+1 board level protection, that is, the station 403 connected to the client service sending end 401 includes a main tributary board 4031 and a standby tributary board 4032. The site connected to the upstream site includes a primary circuit board N and a backup circuit board N, exemplified by a station 404 that is connected to the upstream site 403 via an upstream line of the site 404, the site 404 The main circuit board is the circuit board 4041, and the standby circuit board of the station 404 is the circuit board 4042.

It should be clarified that the 1+1 board level protection shown in this embodiment is described by way of example, and can also be applied to 1:M board level protection, that is, the station includes one main branch board T and M spare branches. The board T or one main board N and M spare boards N.

The M standby boards can be set with a priority level, so that if the upstream line is abnormal, the standby board is selected according to the priority set by the M standby boards to complete the protection switching.

Taking the site 403 as an example, the upstream line of the station 403 is a line between the primary tributary board 4031 and the client service sending end 401. If the upstream line is normal, the cross slab of the station 403 The service data stream is obtained by the primary tributary board 4031. If the upstream line is abnormal, the cross-board of the station 403 obtains the service data flow through the standby tributary board 4032 to complete the protection switching and ensure the service data flow. Normal transmission.

In this embodiment, the station performs an abnormality detection on the upstream line of the station to determine whether an abnormality occurs in the upstream line of the station.

It should be clarified that the embodiment does not limit how the abnormality detection is specifically performed on the site. As long as the upstream line is abnormal, the site can quickly detect and determine.

For example, if the station detects the warning information, it determines that the upstream line is abnormal, and the warning information may be: Loss of Signal (LOS), Loss of Frame (LOF), Loss of Clock (LOSS of clocl) , LOC), OUT of frame (OOF), signal degradation (SD), etc.

302. During the abnormality detection, if the station determines that the first data frame does not satisfy the preset condition, the station modifies the first data frame to modify the downstream station sent to the site. The first data frame is used to indicate that the downstream station does not perform protection switching;

During the abnormality detection, that is, when step 301 is performed, when the station has not determined whether the upstream line of the station is abnormal, the station needs to send the first data frame to the downstream station, if the upstream line of the station occurs If the abnormality occurs, the first data frame is abnormal. The abnormal first data frame triggers the protection of the downstream site of the site. In order to ensure that the downstream site does not perform erroneous switching during the abnormality detection of the site, The station first detects a first data frame to be sent by the station to the downstream station to determine whether the first data frame satisfies a preset condition.

The preset condition is not limited in this embodiment, and the downstream station of the station does not perform protection switching according to the first data frame that satisfies the preset condition.

303. If the station detects that the upstream line of the station is abnormal according to the first data frame, the station performs protection switching.

That is, the station detects that the upstream line of the station is abnormal according to the first data frame of the service data flow that the station has sent to the downstream station, and performs protection switching at the site to ensure normal transmission of the data stream.

As shown in FIG. 4, the site 403 is taken as an example. If the site 403 determines that the upstream line of the site 403 is abnormal, that is, the line between the primary tributary board 4031 of the site and the client service sending end 401 is abnormal. Then, the cross board of the station 403 receives the service data stream sent by the client service sending end 401 from the standby tributary board 4032.

304. The station modifies the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream station does not perform protection switching.

The second data frame of the service data flow is modified by the station to prevent the downstream line from being abnormally changed, wherein the second data frame is an abnormality of the site. The data frame received by the upstream line and sent to the downstream station after the abnormality detection period.

This embodiment does not limit how the site specifically modifies the service data stream. As long as the site sends the modified service data stream to the downstream site, the downstream site does not perform protection switching.

Specifically, the service data flow is modified by the site in this embodiment, so that the first data frame sent by the station to the downstream site during the abnormality detection and the first sent to the downstream site after the abnormality detection period are performed. Neither data frame triggers the downstream site for protection switching, so there is Effectively, the downstream station is prevented from being erroneously switched, so that the service line recovery time is not long due to the mistake of the downstream station, and in this embodiment, the protection line is not generated at the site where the upstream line does not fail, so that the maintenance personnel It can quickly determine that the site where the protection switching occurs is the site that sends the abnormality to the upstream line, which realizes the rapid location of the faulty site and makes the network maintenance simple.

The embodiment shown in FIG. 3 illustrates the implementation method of the switching in detail. The following describes an example of how the station performs an abnormality detection to determine whether an abnormality occurs in the upstream line, in conjunction with the embodiment shown in FIG. 5;

501. The site obtains a service data stream.

The site may be connected to the client service through the upstream line, or may be connected to the upstream site, that is, if the upstream line of the site is connected to the client service sender, the specific manner for the site to obtain the service data flow is: Receiving, by the station, a service signal sent by the client service sending end, where the station maps the service signal into a service data stream, where the service data stream includes the first data frame and the second data frame;

As shown in FIG. 4, the tributary board T of the station 403 connected to the client service sending end 401 is configured to map the service signal sent by the client service sending end 401 into a service data stream of the low-order ODUi. The circuit board N encapsulates the service data streams of the plurality of low-order ODUi into a high-order OTUk service data stream, and the high-order OTUk service data stream can be sent to the downstream station 404.

If the upstream line of the site is connected to the upstream site of the site, the specific manner of the site acquiring the service data flow is: the site receives the service data flow sent by the upstream site, where the service data flow includes the The first data frame and the second data frame are described.

As shown in FIG. 4, the tributary board T of the station 404 receives the high-order OTUk service data stream sent by the upstream station 403 through the upstream line, and the tributary board T of the station 404 sets the high-order OTUk service data. The stream is parsed into a business data stream of a low-order ODUi.

502. The site determines a preset coding mode of the site.

The preset coding mode is a coding mode of the service signal or the service data flow received by the station through a normal uplink line;

The preset coding mode is pre-determined by the site and the client service sending end or the upstream site, or notified to the site by the management network element, where the management network element and the client service sending end respectively Connect to the site.

The station can perform different correctness checks on different service signals by using a preset coding mode. Measurement.

For example, check the 66/64B out-of-synchronization check for the Ethernet service.

503, the station determines whether the encoding mode of the first data frame conforms to a preset encoding mode, and if so, proceeds to step 504, and if not, proceeds to step 505;

504. The station determines that the upstream line is normal.

505. The station determines that the upstream line is abnormal.

506. During the abnormality detection, if the station determines that the first data frame does not satisfy the preset condition, the station modifies the first data frame to modify the downlink station sent to the site. The first data frame is used to indicate that the downstream station does not perform protection switching;

In this embodiment, when the station performs step 502 to step 505 to determine whether the upstream line is abnormal, the station needs to perform step 506 after performing step 501 to obtain the service data flow to prevent the During the abnormality detection of the site (ie, step 502 to step 505), the first data frame sent to the downstream site triggers the downstream site to perform protection switching, and then the step 506 is required to modify the first data frame to be sent to the The modified first data frame of the downstream site of the site is used to indicate that the downstream site does not perform protection switching.

507. If the station detects that the uplink line of the station is abnormal according to the first data frame, the station performs protection switching.

508. The station modifies the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream site does not perform protection switching.

The steps 506 to 508 in the embodiment are the same as the steps 302 to 304 in FIG. 3, and are not described in this embodiment.

509. If the station detects that the upstream line of the station is normal according to the first data frame, the station sends the second data frame to the downstream station.

If the upstream line is normal, the station does not need to modify the second data frame, because if the upstream line is normal, the second data frame sent through the normal upstream line does not trigger the downstream station to perform protection switching.

In this embodiment, it is determined whether the upstream line is abnormal by using a preset coding manner, and the service data stream is modified by the site in this embodiment, so that the first data frame and the first data frame sent by the station to the downstream station during the abnormality detection are performed. a second data frame sent to the downstream site after the abnormality detection period The protection of the downstream site is not triggered, so that the downstream site can be prevented from being erroneously switched, and the traffic signal recovery time is not long due to the reverse switching of the downstream site. In this embodiment, the upstream line does not fail. The protection switching will not occur at the site, so that the maintenance personnel can quickly determine that the site where the protection switching occurs is the site that sends the abnormality to the upstream line, and realizes the rapid location of the faulty site, which makes the network maintenance simple.

The embodiment shown in FIG. 3 illustrates the implementation method of the switching in detail. The following describes an example of how the station performs an abnormality detection to determine whether an abnormality occurs in the upstream line, in conjunction with the embodiment shown in FIG. 6;

601. The site obtains a service data flow.

For the specific process of step 601 in this embodiment, please refer to step 501 shown in FIG. 5, which is not described in this embodiment.

602. If the station determines that the service data flow has a demapping path, the station determines that the station performs correctness detection on the service data flow by using a frame header position.

That is, if the station receives the high-order OTUk service data stream sent by the upstream station, the station determines whether the high-order OTUk service data stream is encapsulated with multiple low-order ODUi service data flows. A service data stream of a plurality of low-order ODUis can be solved, and a demapping path is determined.

In this embodiment, how to detect whether a high-order OTUk service data stream has a demapping path is not limited, for example, by detecting a frame header of each frame of a high-order OTUk service data stream or by using a high-order OTUk service data stream. Clock frequency deviation detection, etc.

603. The station performs a frame header search on the service data flow.

The site searches for a frame header in the service data stream received by the site, where the site specifically performs the frame header search of the service data stream, which is not described in this embodiment.

604, the station determines whether the frame header can be continuously searched within the preset duration, if not, proceed to step 605, and if so, proceed to step 606;

Specifically, after the station receives a frame, the frame header position of the next frame may be estimated according to the frame header position of the current frame, that is, the station performs a frame header search on the first data frame of the service data stream, when searching After a frame header, the station can estimate the frame header position of the next frame, and when the station receives the next frame, determining that the frame header of the frame is the same as the pre-estimated position, the search continues until If the frame header of the frame searched within the preset duration is the same as the preset, the station can determine that the station continuously searches for the frame header.

If the upstream line of the station is normal, the station may continuously search for the frame header. If the upstream line of the station is abnormal, the station may not continuously search for the frame header within a preset duration.

605. The station determines that an upstream line is abnormal.

606. The station determines that its upstream line is normal.

607. During the abnormality detection, if the station determines that the first data frame does not satisfy the preset condition, the station modifies the first data frame to modify the downlink station sent to the site. The first data frame is used to indicate that the downstream station does not perform protection switching;

That is, in this embodiment, when the station performs step 602 to step 606 to determine whether the upstream line is abnormal, after performing the step 601 to obtain the service data flow, the station needs to perform step 607 to prevent the During the abnormality detection of the site (ie, step 602 to step 606), the first data frame sent to the downstream site triggers the downstream site to perform protection switching, and then step 607 is performed to modify the first data frame to be sent to the The modified first data frame of the downstream site of the site is used to indicate that the downstream site does not perform protection switching.

608. If the station detects that the upstream line of the station is abnormal according to the first data frame, the station performs protection switching.

609. The site modifies the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream site does not perform protection switching.

Steps 607 to 609 in this embodiment are the same as the steps from step 302 to step 304 shown in FIG. 3, and are not described in this embodiment.

610. If the station determines that the upstream line of the station is normal, the station sends the second data frame to a downstream station.

In this embodiment, by performing a search on the frame header of the first data frame to determine whether the upstream line is abnormal, the service data stream is modified by the site in this embodiment, so that the site is sent to the downstream site during the abnormality detection. The first data frame and the second data frame sent to the downstream station after the abnormality detection period do not trigger the protection switching of the downstream station, thereby effectively avoiding the reverse switching of the downstream station, thereby not being mistaken by the downstream station. Switching to change the service signal recovery time Long, and in this embodiment, the protection line does not occur in the site where the upstream line does not fail, so that the maintenance personnel can quickly determine that the site where the protection switching occurs is the site that sends the abnormality to the upstream line, and realizes the rapid positioning of the faulty site. Make network maintenance simple.

The embodiment shown in FIG. 3 illustrates the implementation method of the switching in detail. The following describes an example of how the station performs an abnormality detection to determine whether an abnormality occurs in the upstream line, in conjunction with the embodiment shown in FIG. 7;

701. The site obtains a service data flow.

For the specific process of step 701 in this embodiment, please refer to step 501 shown in FIG. 5, which is not described in this embodiment.

702. The station determines a clock frequency offset of the first data frame.

The method for determining the clock frequency offset of the first data frame according to the first data frame of the service data flow is the prior art, and is not described in this embodiment, as long as the station can determine The clock frequency offset of the first data frame is sufficient.

703, the station determines whether the clock frequency offset of the first data frame is greater than or equal to the threshold; if yes, proceed to step 704, and if not, proceed to step 705;

Determining, by the site, the threshold value, the threshold value may be pre-agreed by the site and the client service sending end, or notified by the management network element, how specific is the threshold value in this embodiment The setting is not limited, as long as the clock frequency offset is greater than or equal to the threshold, the station determines that the upstream line of the station is abnormal.

704. The station determines that an upstream line of the station is abnormal.

705. The station determines that an upstream line of the station is normal.

706. During the abnormality detection, if the station determines that the first data frame does not satisfy the preset condition, the station modifies the first data frame to modify the downlink station sent to the site. The first data frame is used to indicate that the downstream station does not perform protection switching;

That is, in the embodiment, when the station performs step 702 to step 705 to determine whether the upstream line is abnormal, after the step 701 is performed to obtain the service data flow, the station needs to perform step 706 to prevent the During the abnormality detection of the site (ie, step 702 to step 705), the first data frame sent to the downstream site triggers the downstream site to perform protection switching, and then step 706 is performed to modify the first data frame to be sent to the The modified first data frame of the downstream site of the site is used to indicate that the downstream site does not perform protection switching.

707. If the station detects that the uplink line of the station is abnormal according to the first data frame, the station performs protection switching.

708. The station modifies the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream site does not perform protection switching.

The steps 706 to 708 in the embodiment are the same as the steps 302 to 304 in the embodiment shown in FIG. 3, and are not described in this embodiment.

709. If the station detects that the upstream line of the station is normal, the station sends the second data frame to the downstream station.

In this embodiment, the uplink data line is determined to be abnormal according to whether the clock frequency offset of the first data frame is greater than or equal to the threshold value, and the service data flow is modified by the site in this embodiment, so that the site is in progress. The first data frame sent to the downstream site during the abnormality detection and the second data frame sent to the downstream site after the abnormality detection period do not trigger the protection switching of the downstream site, thereby effectively avoiding the reverse switching of the downstream site, and further The service signal recovery time is not long due to the misplacement of the downstream site, and in this embodiment, the site where the upstream line does not fail does not undergo protection switching, so that the maintenance personnel can quickly determine that the site where the protection switching occurs is The upstream line sends an abnormal site, which realizes the rapid location of the faulty site, making network maintenance simple.

The following describes how the site modifies the service data flow in conjunction with the embodiment shown in FIG. 8:

801. The site obtains a service data flow.

For details, please refer to step 501 shown in FIG. 5, and no further description is made in this step.

802. The station detects whether an upstream line of the station is abnormal.

For the specific process of step 801 shown in this embodiment, please refer to step 301 shown in FIG. 3, which is not described in this embodiment.

803. The station determines a clock frequency offset of the first data frame.

The method for determining the clock frequency offset of the first data frame according to the first data frame of the service data flow is the prior art, and is not described in this embodiment, as long as the site can The clock frequency offset of the first data frame is determined.

804, during the abnormality detection, the station determines whether the first data frame meets the preset condition; if not, proceed to step 805; if yes, proceed to step 806;

The current clock frequency offset in the preset range is used to indicate that the downstream station does not perform protection switching;

If the station determines that the clock frequency offset of the first data frame is within the preset range, the station determines that the first data frame meets the preset condition;

805. The station modifies a clock frequency offset of the first data frame, so that a clock frequency offset of the modified first data frame is located in the preset range.

That is, the first data frame is modified by step 805, so that the modified first data frame satisfies the preset condition.

806. The station sends the first data frame to a downstream site.

That is, the station sends the first data frame that meets the preset condition determined by step 804 or the first data frame that meets the preset condition determined by step 805 to the downstream site, so that the site performs the During the abnormality detection, the downstream site does not perform protection switching.

Step 802 is caused to make the station determine that its upstream line is abnormal, then proceed to step 807;

807. If the station detects that the upstream line of the station is abnormal according to the first data frame, the station performs protection switching.

For the specific process of step 807 in this embodiment, please refer to step 303 shown in FIG. 3, which is not described in this embodiment.

808. The station generates a clock by self-oscillation.

After the abnormality detection period of the station is performed, it is determined that the upstream line of the station is abnormal, and in order to prevent the downstream station from performing erroneous switching, the station generates a clock by self-oscillation.

For details, how to generate a clock by self-oscillation is known in the prior art, and will not be described in this step.

809. The station determines that a clock generated by the self-oscillation of the station is a target clock.

The target clock is used to indicate that the downstream station does not perform protection switching;

810. The station is self-oscillated to generate a periodic frame header.

After the abnormality detection period is performed, the station determines that the upstream line of the station is abnormal. To prevent the downstream station from performing erroneous switching, the station generates a periodic frame header by self-oscillation.

The specific structure of the site is self-oscillation to generate a periodic frame header. Please refer to the prior art, and no further details are provided in this step.

811. The station determines that a static frame header is generated by the station from a vibration as a target frame header.

The target frame header is used to indicate that the downstream site does not perform protection switching;

812. The station detects, in the overhead of the second data frame, that the switching indication information is used to indicate the switching of the downstream station, where the site modifies the switching indication information, so that the modified The switching indication information is used to indicate that the downstream station does not perform protection switching;

The switching indication information is used by the station to instruct its downstream station to perform protection switching;

Specifically, the overhead is set in each frame in the service data flow.

813. The site determines that the cost of the modified switching indication information is set as a target cost.

814. The station replaces a clock of the second data frame with the target clock, the station replaces a frame header of the second data frame with the target frame header, and the station will be the second The overhead of the data frame is replaced by the target overhead;

That is, the second data frame is modified in step 814, so that the second data frame carrying the target clock, the target frame header, and the target overhead does not trigger the downstream station to perform protection switching.

It should be clarified that the steps of determining the target clock (steps 808 to 809) shown in this embodiment, the steps of determining the target frame header (steps 810 to 811), and the step of determining the target overhead (step 812 to step) 813) The timing relationship is illustrated by way of example and is not limited, wherein the step of determining the target clock, the step of determining the target frame header, and the step of determining the target overhead are arbitrary, or may be juxtaposed, as long as the station is capable of standing Determine the target clock, target frame header, and target cost.

In this embodiment, during the abnormality detection, the clock frequency offset received by the station is modified, so that the modified clock frequency offset within the preset range indicates the downstream during the abnormality detection of the station. The site does not perform protection switching, so that the first data frame sent by the station to the downstream site during the abnormality detection does not trigger the protection switching of the downstream site, further avoiding the possibility of erroneous switching, and the site detects the abnormality during the abnormality detection period. The subsequent second data frame is modified so that The modified second data frame does not trigger the protection switching of the downstream station, so that the abnormality of the upstream line does not spread, and thus the downstream station does not perform erroneous switching during the abnormality detection. Because the error of the downstream site is changed, the service signal recovery time becomes longer, and in this embodiment, the site where the upstream line does not fail does not undergo protection switching, so that the maintenance personnel can quickly determine that the site where the protection switching occurs is the upstream line. Sending an abnormal site enables rapid location of the faulty site, making network maintenance simple.

For a better understanding of the embodiments of the present invention, the following describes the implementation method of the switching provided by the present invention in detail:

In the embodiment of the present invention, the site where the upstream line is abnormal may be a site connected to the client service sender end or a site connected to the upstream site;

In this application scenario, a site where an abnormality occurs on the upstream line is a site connected to the sender of the client service is taken as an example for description;

When receiving the service signal sent by the client service sending end, the T board of the station maps the service signal into the service data stream of the low-order ODUi, and the circuit board N of the station encapsulates the service data streams of the plurality of low-order ODUi. High-order OTUk business data flow;

Specifically, the service data stream includes a first data frame and a second data frame, where the first data frame is a data frame that is sent to a downstream station during an abnormality detection of the station, where the second data frame is A data frame sent to the downstream site after the abnormality detection period.

The T-board of the station performs an abnormality detection on the first data frame to determine whether an upstream line of the station is abnormal;

The specific way to determine whether the upstream line of the station is abnormal is:

The tributary board T of the station determines whether the service signal is correctly detected by a preset coding mode, or whether the service signal is correctly detected by the clock frequency offset detection;

The specific determination manner is that the tributary board T of the station determines whether there is a preset coding mode in the service data flow, and if yes, corrects the service signal by using a preset coding mode; determining the service data. Whether the stream can determine the clock frequency offset, and if so, correct the service signal by detecting the clock frequency offset;

The correctness detection of the service signal according to the preset coding mode is performed by using the tributary board T of the site as an example;

The specific manner in which the tributary board T of the station determines that the service signal is correctly detected by using a preset coding manner is:

The T board of the site determines a preset encoding mode;

In this application scenario, the preset coding mode is an Ethernet service check 66/64B out-of-synchronization check, and the management network element notifies the preset coding mode in advance, if the service signal received by the station is encoded and used. If the preset coding mode is consistent, the service signal is correct. If the coding mode of the service signal does not match the preset coding mode, the service signal is incorrect.

If the T-board of the station detects that the service signal does not meet the preset coding mode, the station determines that the upstream line is abnormal;

If the tributary board T of the station detects the correctness of the service signal by the clock frequency offset detection, the tributary board T of the station first determines the clock frequency offset;

The tributary board T of the station is determined according to whether the clock frequency offset is greater than or equal to the threshold value. If the uplink line is abnormal, the specific determination manner may be:

The tributary board T of the station converts the service signal clock clk_serdes into the clock to be detected clk_otu;

The tributary board T of the station uses the fast and slow pattern to transfer the clock to be detected to the system clock domain gap_otu;

The tributary board T of the station counts gap_otu within 25/3us to generate a count value gap_cnt;

The tributary board T of the station performs a maximum and minimum out of bounds judgment on the count value gap_cnt, and outputs an outbound boundary indication ind;

The tributary board T of the station filters the out-of-bounds indication ind, and if it crosses the boundary n times continuously, it is determined that the clock frequency offset is greater than or equal to the threshold value, indicating that the upstream line is abnormal;

During the abnormality detection, in order to prevent the downstream station of the station from performing erroneous switching, the T board of the station further determines whether the clock frequency offset is within a preset range;

In this embodiment, the T-board of the station determines that the clock frequency offset is not within a preset range as an example:

That is, if the T-board of the station determines that the clock frequency offset is not within the preset range, the T-board of the station modifies the clock frequency offset until the modified clock frequency offset is within a preset range;

The modified clock frequency offset in the preset range is used to indicate that the downstream station does not perform protection switching;

After the abnormality detection period, the T board of the station determines that the upstream line is abnormal, then the station Point for protection switching;

If the upstream line is abnormal, the T-board of the station generates a target clock by self-oscillation, and the self-oscillation generating target clock does not trigger the downstream station to perform erroneous switching;

During the abnormality detection, the circuit board N of the station spontaneously generates a periodic frame header;

The circuit board N of the station determines that the periodic frame header is the target frame header;

During the abnormality detection, when the circuit board N of the station detects that the overhead of the first data frame is set with the switching indication information, the circuit board N of the station modifies the switching indication information, so that The modified switching indication information indicates that the downstream station does not perform protection switching;

And the line board N of the site determines the overhead of the modified switching indication information to be the target overhead;

The circuit board N of the station modifies the second data frame according to the target clock frequency offset, the target frame header, and the target overhead, so that the modified second data frame of the circuit board N of the station is used for indicating The downstream site does not perform protection switching;

The circuit board N of the downstream station receives the modified second data frame sent by the upstream station, and the downstream station does not perform protection switching according to the modified second data frame.

The specific structure of the site that can prevent mis-switching is described in detail below with reference to FIG. 9:

The site specifically includes:

The detecting unit 901 is configured to detect whether an upstream line of the station is abnormal.

The circuit board N of the station 405 connected to the customer service receiving end 402 converts the high-order OTUk service data stream into the service data stream of the low-order ODUi, and the tributary board T of the station 405 sets the low-order ODUi The service data stream is demapped into a service signal for transmission to the client service receiver 402.

The station 403 for mapping the service signal and the station 405 for performing the demapping process on the service data stream further includes at least one station 404 for transmitting the high-order OTUk service data stream, and the specific number is not used. limited.

In this embodiment, the detecting unit 901 of the station tributary board T performs an abnormality detection on the upstream line of the station to determine whether an abnormality occurs in the upstream line of the station.

It should be understood that, in this embodiment, the detection unit 901 specifically performs abnormality detection. As long as the upstream line is abnormal, the detecting unit 901 can quickly detect and determine.

For example, if the detecting unit 901 detects the warning information, it determines an upstream line abnormality, and the warning information may be: Loss of Signal (LOS), Loss of Frame (LOF), Loss of Clock (LOSS) Of clocl, LOC), OUT of frame (OOF), signal degradation (SD), and so on.

a first modifying unit 902, configured to modify the first data frame to modify a downlink station sent to the site, if it is determined that the first data frame does not satisfy the preset condition during the abnormality detection The first data frame is used to indicate that the downstream station does not perform protection switching, where the first data frame is a data frame sent by the station to the downstream station during the abnormality detection;

During the abnormality detection, that is, when the detecting unit 901 determines whether an abnormality occurs in the upstream line of the station, the station needs to send the first data frame to the downstream station, and if an abnormality occurs in the upstream line of the station, The first data frame is abnormal, and the abnormal first data frame triggers the protection of the downstream site of the site for protection switching. In order to ensure that the downstream site does not perform error switching during the abnormality detection of the site, the site is not mis-switched. The first modifying unit 902 first detects a first data frame to be sent by the station to the downstream station to determine whether the first data frame satisfies a preset condition.

The first determining unit 903 is configured to perform protection switching if the upstream line abnormality of the station is detected according to the first data frame;

That is, if the detecting unit 901 detects that an abnormality occurs in the upstream line of the station according to the first data frame of the service data flow that the station has sent to the downstream station, the protection switching is performed at the site to ensure data. Normal transmission of the stream.

As shown in FIG. 4, the station 403 is taken as an example. If the station 403 determines that the upstream line of the station 403 is abnormal, the first determining unit 903 of the station determines the tributary board 4031 for use and the client service sending end 401. If the line is abnormal, the cross board of the station 403 receives the service data stream sent by the client service sending end 401 from the standby tributary board 4032.

The second modifying unit 904 is configured to modify the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream site does not perform protection switching, where The second data frame is a data frame received by the station through the abnormal upstream line and sent to the downstream station after the abnormality detection period.

Because the detecting unit 901 determines that the upstream line is abnormal, the second modifying unit 904 modifies the second data frame of the service data stream, in order to avoid erroneous switching of the downstream line, where the second data frame is modified. Receiving the abnormality check for the site through the abnormal upstream line A data frame sent to the downstream site after the measurement period.

The embodiment does not limit how the second modification unit 904 specifically modifies the service data flow. If the site sends the modified service data flow to the downstream site, the downstream site does not perform protection switching. can.

Modifying, by the site in this embodiment, the service data flow, so that the first data frame sent by the station to the downstream site during the abnormality detection and the second data frame sent to the downstream site after the abnormality detection period The protection of the downstream site is not triggered, so that the downstream site can be prevented from being erroneously switched, and the traffic signal recovery time is not long due to the reverse switching of the downstream site. In this embodiment, the upstream line does not fail. The protection switching will not occur at the site, so that the maintenance personnel can quickly determine that the site where the protection switching occurs is the site that sends the abnormality to the upstream line, and realizes the rapid location of the faulty site, which makes the network maintenance simple.

FIG. 9 is a detailed description of a specific structure of a site that can prevent mis-switching. The specific structure of a site that can implement anomaly detection to determine whether an abnormality occurs on the upstream line is described in detail below with reference to FIG. 10:

The site includes:

The first receiving unit 1001 is configured to: if the upstream line of the station is connected to the client service sending end, receive a service signal sent by the client service sending end;

a second determining unit 1002, configured to map the service signal into a service data stream, where the service data stream includes the first data frame and the second data frame;

As shown in FIG. 4, the second determining unit 1002 of the tributary T of the station 403 connected to the client service sending end 401 is configured to process the service signal sent by the client service sending end 401 into a low-order ODUi. The service data stream, the circuit board N of the station encapsulates the service data streams of the plurality of low-order ODUi into a high-order OTUk service data stream, and the high-order OTUk service data stream can be sent to the downstream station 404.

The second receiving unit 1003 is configured to: if the upstream line of the station is connected to an upstream station of the station, receive a service data flow sent by the upstream station, where the service data flow includes the first data frame And the second data frame;

As shown in FIG. 4, the second receiving unit 1003 of the tributary T of the station 404 receives the high-order OTUk service data stream sent by the upstream station 403 through the upstream line, and the tributary board T of the station 404 The high-order OTUk service data stream is parsed into a low-order ODUi service data stream.

a detecting unit 1004, configured to detect whether an upstream line of the station is abnormal;

Specifically, the detecting unit 1004 includes:

The first determining module 10041 is configured to determine whether the coding mode of the first data frame is consistent with a preset coding mode, where the preset coding mode is the service signal received by the station through a normal uplink line or Encoding method of the service data stream;

The station can perform different correctness detection on different service signals by using a preset coding mode.

The second determining module 10042 is configured to determine that the upstream line is normal if it is determined that the encoding manner of the first data frame conforms to a preset encoding manner;

The third determining module 10043 is configured to determine that the upstream line is abnormal if it is determined that the encoding manner of the first data frame does not meet the preset encoding manner;

The first modifying unit 1005 is configured to modify, during the abnormality detection, that the first data frame does not satisfy the preset condition, to modify the first data frame, so as to modify the downstream station sent to the site The first data frame is used to indicate that the downstream station does not perform protection switching, where the first data frame is a data frame sent by the station to the downstream station during the abnormality detection;

The first determining unit 1006 is configured to perform protection switching if the uplink line abnormality of the station is detected according to the first data frame;

The second modifying unit 1007 is configured to modify the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream site does not perform protection switching, where The second data frame is a data frame received by the station through the abnormal upstream line and sent to the downstream station after the abnormality detection period.

In this embodiment, it is determined whether the upstream line is abnormal by using a preset coding manner, and the station is used in this embodiment. Modifying the service data stream so that the first data frame sent by the station to the downstream station during the abnormality detection and the second data frame sent to the downstream station after the abnormality detection period do not trigger the downstream station The protection switching is performed to effectively prevent the downstream station from being erroneously switched, so that the service line recovery time is not long due to the erroneous switching of the downstream station, and in this embodiment, the station having no fault on the upstream line does not protect. The switching enables the maintenance personnel to quickly determine that the site where the protection switching occurs is the site that sends the abnormality to the upstream line, and realizes the rapid location of the faulty site, which makes the network maintenance simple.

FIG. 9 is a detailed description of a specific structure of a site that can prevent mis-switching. The specific structure of a site that can implement anomaly detection to determine whether an abnormality occurs on the upstream line is described in detail below with reference to FIG. 11 :

The site includes:

The first receiving unit 1101 is configured to: if the upstream line of the station is connected to the client service sending end, receive a service signal sent by the client service sending end;

a second determining unit 1102, configured to map the service signal into a service data stream, where the service data stream includes the first data frame and the second data frame;

The second receiving unit 1103 is configured to: if the upstream line of the station is connected to an upstream station of the station, receive a service data flow sent by the upstream station, where the service data flow includes the first data frame And the second data frame;

a detecting unit 1104, configured to detect whether an upstream line of the station is abnormal;

Specifically, the detecting unit 1104 includes:

a fourth determining module 11041, configured to perform a frame header search on the first data frame;

The fifth determining module 11042 is configured to determine whether the frame header can be continuously searched within the preset duration;

The sixth determining module 11043 is configured to determine that the upstream line of the station is normal if the frame header can be continuously searched within a preset time period;

The seventh determining module 11044 is configured to determine that an upstream line of the station is abnormal if the frame header cannot be continuously searched within a preset duration;

a first modifying unit 1105, configured to modify, when the first data frame does not satisfy the preset condition, during the abnormality detection, to modify the first data frame, so as to modify the downstream station sent to the site The first data frame is used to indicate that the downstream station does not perform protection switching, where a first data frame is a data frame sent by the station to the downstream station during the abnormality detection;

The first determining unit 1106 is configured to perform protection switching if the upstream line abnormality of the station is detected according to the first data frame;

a second modifying unit 1107, configured to modify the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream site does not perform protection switching, where The second data frame is a data frame received by the station through the abnormal upstream line and sent to the downstream station after the abnormality detection period.

In this embodiment, by performing a search on the frame header of the first data frame to determine whether the upstream line is abnormal, the service data stream is modified by the site in this embodiment, so that the site is sent to the downstream site during the abnormality detection. The first data frame and the second data frame sent to the downstream station after the abnormality detection period do not trigger the protection switching of the downstream station, thereby effectively avoiding the reverse switching of the downstream station, thereby not being mistaken by the downstream station. Switching to make the service signal recovery time become longer, and in this embodiment, the site where the upstream line does not fail does not undergo protection switching, so that the maintenance personnel can quickly determine that the site where the protection switching occurs is the site where the upstream line sends an abnormality. The rapid location of the faulty site is achieved, making network maintenance simple.

FIG. 9 is a detailed description of a specific structure of a site that can prevent mis-switching. The specific structure of a site that can implement anomaly detection to determine whether an abnormality occurs on the upstream line is described in detail below with reference to FIG. 12:

The site includes:

The first receiving unit 1201 is configured to: if the upstream line of the station is connected to the client service sending end, receive a service signal sent by the client service sending end;

a second determining unit 1202, configured to map the service signal into a service data stream, where the service data stream includes the first data frame and the second data frame;

The second receiving unit 1203 is configured to: if the upstream line of the station is connected to an upstream station of the station, receive a service data flow sent by the upstream station, where the service data flow includes the first data frame And the second data frame;

The third determining unit 1204 is configured to determine a clock frequency offset of the first data frame.

The detecting unit 1205 is configured to detect whether an upstream line of the station is abnormal.

Specifically, the detecting unit 1205 includes:

The eighth determining module 12051 is configured to determine whether a clock frequency offset of the first data frame is greater than or equal to a threshold value;

The ninth determining module 12052 is configured to determine that an uplink line of the station is abnormal if a clock frequency offset of the first data frame is greater than or equal to a threshold value;

The tenth determining module 12053 is configured to determine that an upstream line of the station is normal if a clock frequency offset of the first data frame is less than a threshold value;

The first modifying unit 1206 is configured to modify, during the abnormality detection, that the first data frame does not satisfy the preset condition, and modify the first data frame to modify the downstream station sent to the site. The first data frame is used to indicate that the downstream station does not perform protection switching, where the first data frame is a data frame sent by the station to the downstream station during the abnormality detection;

The first determining unit 1207 is configured to perform protection switching if the upstream line abnormality of the station is detected according to the first data frame;

a second modifying unit 1208, configured to modify the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream site does not perform protection switching, where The second data frame is a data frame received by the station through the abnormal upstream line and sent to the downstream station after the abnormality detection period.

The specific structure of a site that can modify the service data flow is described below with reference to FIG.

The site includes:

The first receiving unit 1301 is configured to: if the upstream line of the station is connected to the client service sending end, receive a service signal sent by the client service sending end;

a second determining unit 1302, configured to map the service signal into a service data stream, where the The service data stream includes the first data frame and the second data frame;

The second receiving unit 1303 is configured to: if the upstream line of the station is connected to the upstream station of the station, receive a service data flow sent by the upstream station, where the service data flow includes the first data frame And the second data frame;

a third determining unit 1304, configured to determine a clock frequency offset of the first data frame;

a detecting unit 1305, configured to detect whether an upstream line of the station is abnormal;

a first modifying unit 1306, configured to modify, when the first data frame does not meet the preset condition, during the abnormality detection, to modify the first data frame, so as to modify the downstream station sent to the site The first data frame is used to indicate that the downstream station does not perform protection switching, where the first data frame is a data frame sent by the station to the downstream station during the abnormality detection;

Specifically, the first modifying unit 1306 includes:

An eleventh determining module 13061, configured to determine, during an abnormality detection of the station, whether a clock frequency offset of the first data frame is within a preset range, where the current clock is located within the preset range The frequency offset is used to indicate that the downstream station does not perform protection switching;

The twelfth determining module 13062 is configured to: if it is determined that the clock frequency offset of the first data frame is not located in the preset range, determine that the first data frame does not satisfy the preset condition;

The thirteenth determining module 13063 is configured to modify a clock frequency offset of the first data frame, so that the modified clock frequency offset of the first data frame is located within the preset range.

The first determining unit 1307 is configured to perform protection switching if the upstream line abnormality of the station is detected according to the first data frame;

The site also includes:

a first self-oscillation unit 1308, configured to generate a clock by self-oscillation;

a fourth determining unit 1309, configured to determine that the clock generated by the self-oscillation of the station is a target clock, where the target clock is used to indicate that the downstream station does not perform protection switching;

a second self-oscillation unit 1310, configured to generate a periodic frame header by self-oscillation;

The fifth determining unit 1311 is configured to determine that the frame header of the station self-oscillation is a target frame header, where the target frame header is used to indicate that the downstream station does not perform protection switching.

The sixth determining unit 1312 is configured to detect that the switching instruction information for indicating the switching of the downstream station is set in the overhead of the second data frame, and then modify the switching indication information to modify The changed switching indication information is used to indicate that the downstream station does not perform protection switching;

The seventh determining unit 1313 is configured to determine that the overhead of the modified switching indication information is set as a target overhead;

a second modifying unit 1314, configured to replace a clock of the second data frame with the target clock, to replace a frame header of the second data frame with the target frame header, and to use the The overhead of the two data frames is replaced by the target overhead.

In this embodiment, during the abnormality detection, the clock frequency offset received by the station is modified, so that the modified clock frequency offset within the preset range indicates the downstream during the abnormality detection of the station. The site does not perform protection switching, so that the first data frame sent by the station to the downstream site during the abnormality detection does not trigger the protection switching of the downstream site, further avoiding the possibility of erroneous switching, and the site detects the abnormality during the abnormality detection period. The subsequent second data frame is modified such that the modified second data frame does not trigger the protection switching of the downstream station, so that the abnormality of the upstream line does not spread, thereby causing the station to perform abnormality detection during the abnormality detection. The downstream site does not undergo erroneous switching, and the service signal recovery time becomes longer due to the erroneous switching of the downstream site. In this embodiment, the site where the upstream line does not fail does not undergo protection switching, so that the maintenance personnel can quickly Determining the site where the protection switching occurs is the site that sends the abnormality to the upstream line. Quickly locate the site, making the network simple maintenance.

For a better understanding of the embodiments of the present invention, the following provides a detailed description of the site provided by the present invention:

When the first receiving unit 1001 of the T-board of the station receives the service signal sent by the client service sending end, the second determining unit 1002 of the T-board of the station maps the service signal into the service data stream of the low-order ODUi, The circuit board N of the station encapsulates the service data streams of the plurality of low-order ODUi into a high-order OTUk service data stream;

Specifically, the service data stream includes a first data frame and a second data frame, where the first data frame is a data frame that is sent to a downstream site during an abnormality detection of the station, where the second data is The frame is a data frame that is sent to the downstream site after the abnormality detection period.

The detecting unit 1004 of the T-board of the station performs an abnormality detection on the first data frame to determine whether an upstream line of the station is abnormal;

The detecting unit 1004 of the tributary board T of the station determines whether the correctness of the service signal is detected by the preset coding mode or the correctness of the service signal is detected by the clock frequency offset detection;

The specific determining manner is that the detecting unit 1004 of the tributary board T of the station determines whether there is a preset encoding mode in the service data stream, and if yes, corrects the service signal by using a preset encoding manner; Whether the service data stream can determine a clock frequency offset, and if so, correcting the service signal by using a clock frequency offset detection;

The detection unit 1004 of the tributary board T of the site performs the correctness detection of the service signal according to the preset coding mode as an example;

The specific manner in which the detecting unit 1004 of the tributary board T of the site determines that the service signal is correctly detected by using a preset encoding manner is:

The first determining module 10041 of the T board of the site determines a preset encoding mode;

If the third determining module 10043 of the T-board of the site detects that the service signal does not meet the preset encoding mode, the third determining module 10043 of the site determines that the upstream line is abnormal;

If the detection unit 1205 of the tributary T of the station detects the correctness of the service signal by the clock frequency offset detection, the third determining unit 1204 of the tributary T of the station first determines the clock frequency offset;

The eighth determining module 12051 of the tributary T of the station determines whether the clock frequency offset is greater than or equal to the threshold according to the determined threshold. If the ninth determining module 12052 determines that the upstream line is abnormal, the specific determining unit 12052 determines that the upstream line is abnormal. The method of determination can be:

The eighth determining module 12051 of the tributary T of the station converts the service signal clock clk_serdes into the to-be-checked clock clk_otu;

The eighth determining module 12051 of the tributary board T of the station uses the fast and slow pattern to transfer the clock to be detected to the system clock domain gap_otu;

The eighth determining module 12051 of the tributary T of the station counts gap_otu within 25/3us to generate a count value gap_cnt;

The eighth determining module 12051 of the tributary board T of the station performs a maximum and minimum out of bounds judgment on the count value gap_cnt, and outputs an outbound boundary indication ind;

The eighth determining module 12051 of the tributary T of the station filters the outbound indication ind, and the nth determining module 12052 determines that the clock frequency offset is greater than or equal to the threshold, indicating the upstream line. abnormal;

During the abnormality detection, the eleventh determining module 13061 of the first modifying unit 1306 of the T-board of the station further determines whether the clock frequency offset is at a preset. Within the scope;

In this embodiment, the twelfth determining module 13062 of the first modifying unit 1306 of the T-board of the station determines that the clock frequency offset is not within the preset range as an example:

That is, if the twelfth determining module 13062 of the T-board of the station determines that the clock frequency offset is not within the preset range, the thirteenth determining module 13063 of the T-board of the station modifies the clock frequency offset until The modified clock frequency offset is within a preset range;

During the abnormality detection period, the first determining unit 1307 of the T-board of the station determines that the upstream line is abnormal, and performs protection switching at the local station;

The first self-vibration unit 1308 of the T-board of the station generates a target clock by itself, and the self-oscillation generating target clock does not trigger the downstream station to perform erroneous switching;

During the abnormality detection, the second self-vibration unit 1310 of the circuit board N of the station generates a periodic frame header by self-oscillation;

The fifth determining unit 1311 of the circuit board N of the station determines that the periodic frame header is the target frame header;

During the abnormality detection, the sixth determining unit 1312 of the circuit board N of the station detects that the overhead of the first data frame is set with the switching indication information, and the sixth of the circuit board N of the station The determining unit 1312 modifies the switching indication information, so that the modified switching indication information indicates that the downstream station does not perform protection switching;

And the seventh determining unit 1313 of the circuit board N of the site determines the overhead of the modified switching indication information to be the target overhead;

The second modifying unit 1314 of the circuit board N of the station modifies the second data frame according to the target clock frequency offset, the target frame header, and the target overhead, so that the circuit board N of the station is modified. The second data frame is used to indicate that the downstream site does not perform protection switching;

The present invention also provides a system, the system includes a client service sender for transmitting a service signal, and a client service receiver for receiving the service signal, and the client service sender and the client service receiver There are a plurality of stations as shown in FIGS. 9 to 13 in series.

The embodiment shown in FIG. 9 to FIG. 13 illustrates the structure of the site in detail from the perspective of the module function entity. The site in the embodiment of the present invention is described in detail below with reference to FIG. 14 , which is shown in FIG. 14 . Another embodiment of a site in an embodiment includes:

Figure 14 depicts the structure of a station provided by another embodiment of the present invention;

The site 1400 specifically includes:

The input device 1401, the output device 1402, the processor 1403, and the memory 1404 (wherein the processor 1403 shown in FIG. 14 may have one or more, and one processor 1403 in FIG. 14 is taken as an example);

In some embodiments of the present invention, the input device 1401, the output device 1402, the processor 1403, and the memory 1404 may be connected by a bus or other means, wherein the bus connection is taken as an example in FIG.

A plurality of sites are connected in series between the client service sender and the client service receiver. The processor 1403 is configured to perform the following steps:

Whether the detected upstream line is abnormal;

During the abnormality detection, if it is determined that the first data frame does not satisfy the preset condition, modifying the first data frame, so that the modified first data frame sent to the downstream station is used for indication The downstream station does not perform protection switching, where the first data frame is a data frame that is sent to the downstream station during the abnormality detection;

If the upstream line detected according to the first data frame is abnormal, performing protection switching;

Modifying the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream station does not perform protection switching, where the second data frame is abnormal A data frame received by the upstream line and transmitted to the downstream station after the abnormality detection period.

In other embodiments of the present invention, the processor 1403 is further configured to perform the following steps:

If the upstream line is connected to the client service sending end, the method further includes: before determining whether the upstream line is abnormal, the method further includes:

Receiving a service signal sent by the client service sending end;

Mapping the service signal to a service data stream, where the service data stream includes the first data frame and the second data frame;

If the upstream line is connected to the upstream station, the method further includes: before determining whether the upstream line is abnormal, the method further includes:

Receiving a service data flow sent by the upstream station, where the service data flow includes the first data frame and the second data frame.

Determining whether the coding mode of the first data frame is in accordance with a preset coding mode, where the preset coding mode is a coding mode of the service signal or the service data flow received by the normal uplink line;

If yes, determining that the upstream line is normal;

If not, it is determined that the upstream line is abnormal.

Performing a frame header search on the first data frame;

Determine whether the frame header can be continuously searched for within the preset duration;

If yes, the determined upstream line is normal;

If not, the determined upstream line is abnormal.

Determining a clock frequency offset of the first data frame.

Determining whether a clock frequency offset of the first data frame is greater than or equal to a threshold;

If yes, the determined upstream line is abnormal;

If no, the determined upstream line is normal.

During the abnormality detection, determining whether the clock frequency offset of the first data frame is within a preset range, wherein the current clock frequency offset located in the preset range is used to indicate that the downstream station is not protected. Switching

If it is determined that the clock frequency offset of the first data frame is not within the preset range, determining that the first data frame does not satisfy the preset condition;

And modifying a clock frequency offset of the first data frame, so that a clock offset of the modified first data frame is within the preset range.

Self-oscillation generates a clock;

Determining that the clock generated by the self-oscillation is a target clock, where the target clock is used to indicate that the downstream station does not perform protection switching;

Modifications to the second data frame include:

The clock of the second data frame is replaced with the target clock.

Self-oscillation generates a periodic frame header;

Determining the frame header of the self-oscillation to generate a periodic frame header, where the target frame header is used to indicate that the downstream site does not perform protection switching;

Modifications to the second data frame include:

The frame header of the second data frame is replaced with the target frame header.

And detecting, in the overhead of the second data frame, the switching indication information used to indicate the switching of the downstream station, modifying the switching indication information, so that the modified switching indication information is used to indicate the The downstream site does not perform protection switching;

Determining, that the cost of the modified switching indication information is set as a target overhead;

Modifications to the second data frame include:

The overhead of the second data frame is replaced by the target overhead.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not limited thereto; The present invention has been described in detail with reference to the foregoing embodiments, and those skilled in the art will understand that the technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalently replaced. Modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the invention.

Claims

A switching implementation method is characterized in that a plurality of sites are connected in series between a client service sending end and a client service receiving end, and the method includes:

The station detects whether the upstream line of the station is abnormal;

During the abnormality detection, if the station determines that the first data frame does not satisfy the preset condition, the station modifies the first data frame to enable the modified to be sent to the downstream site of the station. The first data frame is used to indicate that the downstream station does not perform protection switching, where the first data frame is a data frame sent by the station to the downstream station during the abnormality detection;

If the station detects that the upstream line of the station is abnormal according to the first data frame, the station performs protection switching;

Modifying, by the station, the second data frame, so that the modified second data frame sent to the downstream station is used to indicate that the downstream station does not perform protection switching, where the second data frame is A data frame received by the station through the abnormal upstream line and sent to the downstream station after the abnormality detection period.
The switching implementation method according to claim 1, wherein

If the upstream line of the site is connected to the client service sender, the method further includes: before the site determines whether the upstream line of the site is abnormal, the method further includes:

Receiving, by the station, a service signal sent by the sending end of the client service;

The station maps the service signal to a service data stream, where the service data stream includes the first data frame and the second data frame;

If the upstream line of the station is connected to the upstream station of the station, the method further includes: before the station determines whether the upstream line of the station is abnormal, the method further includes:

The station receives a service data stream sent by the upstream station, where the service data stream includes the first data frame and the second data frame.
The switching implementation method according to claim 1 or 2, wherein the determining whether the upstream line of the station is abnormal includes:

Determining, by the station, whether the coding mode of the first data frame is in a preset coding mode, where the preset coding mode is the service signal or the service data flow received by the station through the normal uplink line. Coding method

If yes, the station determines that the upstream line is normal;

If not, the station determines that the upstream line is abnormal.
The switching implementation method according to claim 1 or 2, wherein the determining whether the upstream line of the station is abnormal includes:

Performing, by the station, a frame header search on the first data frame;

Determining, by the station, whether the frame header can be continuously searched within a preset time period;

If yes, the station determines that the upstream line of the station is normal;

If not, the station determines that the upstream line of the station is abnormal.
The method for implementing the switching according to claim 1 or 2, wherein before the determining whether the upstream line of the station is abnormal, the method further includes:

The station determines a clock frequency offset of the first data frame.
The switching implementation method according to claim 5, wherein the determining whether the upstream line of the station is abnormal includes:

Determining, by the station, whether a clock frequency offset of the first data frame is greater than or equal to a threshold;

If yes, the station determines that the upstream line of the station is abnormal;

If not, the station determines that the upstream line of the station is normal.
The method for implementing the switching according to claim 5, wherein during the abnormality detection, if the station determines that the first data frame does not satisfy the preset condition, the station performs modification on the first data frame, including :

During the abnormality detection of the station, the station determines whether a clock frequency offset of the first data frame is within a preset range, wherein the current clock frequency offset located within the preset range is used to indicate The downstream site does not perform protection switching;

If the station determines that the clock frequency offset of the first data frame is not within the preset range, the station determines that the first data frame does not satisfy the preset condition;

The station modifies a clock frequency offset of the first data frame, so that a clock offset of the modified first data frame is within the preset range.
The method for implementing the switching according to claim 1 or 2, wherein, after the abnormality detection, if the station determines that the upstream line of the station is abnormal, the method further includes:

The station generates a clock by self-oscillation;

Determining, by the station, that the clock generated by the self-oscillation of the station is a target clock, where the target clock is used to indicate that the downstream station does not perform protection switching;

Modifying the second data frame by the station includes:

The station replaces the clock of the second data frame with the target clock.
The method for implementing the switching according to claim 1 or 2, wherein, after the abnormality detection, if the station determines that the upstream line of the station is abnormal, the method further includes:

The station is self-oscillated to generate a periodic frame header;

Determining, by the station, the frame header of the static vibration of the station is a target frame header, where the target frame header is used to indicate that the downstream site does not perform protection switching;

Modifying the second data frame by the station includes:

The station replaces a frame header of the second data frame with the target frame header.
The method for implementing the switching according to claim 1 or 2, wherein, after the abnormality detection, if the station determines that the upstream line of the station is abnormal, the method further includes:

If the site detects that the cost of the second data frame is set with the indication information for indicating the switching of the downstream station, the site modifies the switching indication information, so that the modified switching indication is modified. The information is used to indicate that the downstream site does not perform protection switching;

Determining, by the site, that the modified overhead of the switching indication information is a target overhead;

Modifying the second data frame by the station includes:

The station replaces the overhead of the second data frame with the target overhead.
A site characterized by comprising:

a detecting unit, configured to detect whether an upstream line of the station is abnormal;

a first modifying unit, configured to modify the first data frame to ensure that the downlink data sent to the site is modified after determining that the first data frame does not satisfy the preset condition during the abnormality detection The first data frame is used to indicate that the downstream station does not perform protection switching, where the first data frame is a data frame sent by the station to the downstream station during the abnormality detection;

a first determining unit, configured to detect, when the uplink line of the station is different according to the first data frame Often, protection switching is performed;

a second modifying unit, configured to modify the second data frame, so that the modified second data frame sent to the downstream site is used to indicate that the downstream site does not perform protection switching, where The two data frames are data frames received by the station through the abnormal upstream line and sent to the downstream station after the abnormality detection period.
The site of claim 11 wherein said site further comprises:

a first receiving unit, configured to receive a service signal sent by the client service sending end if the upstream line of the station is connected to the client service sending end;

a second determining unit, configured to map the service signal into a service data stream, where the service data stream includes the first data frame and the second data frame;

a second receiving unit, configured to receive, when the upstream line of the station is connected to an upstream station of the station, a service data flow sent by the upstream station, where the service data flow includes the first data frame and The second data frame.
The station according to claim 11 or 12, wherein the detecting unit comprises:

a first determining module, configured to determine whether a coding mode of the first data frame is consistent with a preset coding mode, where the preset coding mode is the service signal or the received by the station by using the normal uplink line Describe the coding method of the service data stream;

a second determining module, configured to determine that the upstream line is normal if it is determined that the encoding manner of the first data frame conforms to a preset encoding manner;

And a third determining module, configured to determine that the upstream line is abnormal if it is determined that the encoding manner of the first data frame does not conform to the preset encoding manner.
The station according to claim 11 or 12, wherein the detecting unit comprises:

a fourth determining module, configured to perform a frame header search on the first data frame;

a fifth determining module, configured to determine whether the frame header can be continuously searched within a preset duration;

a sixth determining module, configured to determine that the upstream line of the station is normal if the frame header can be continuously searched within a preset duration;

The seventh determining module is configured to determine that the upstream line of the station is abnormal if the frame header cannot be continuously searched for a preset duration.
The site according to claim 11 or 12, wherein the site further comprises:

And a third determining unit, configured to determine a clock frequency offset of the first data frame.
The station according to claim 15, wherein the detecting unit comprises:

An eighth determining module, configured to determine whether a clock frequency offset of the first data frame is greater than or equal to a threshold value;

a ninth determining module, configured to determine that an upstream line of the station is abnormal if a clock frequency offset of the first data frame is greater than or equal to a threshold value;

The tenth determining module is configured to determine that the upstream line of the station is normal if the clock frequency offset of the first data frame is less than a threshold.
The station according to claim 15, wherein the first modifying unit comprises:

An eleventh determining module, configured to determine, during an abnormality detection of the station, whether a clock frequency offset of the first data frame is within a preset range, where the current clock frequency is within the preset range Used to indicate that the downstream site does not perform protection switching;

a twelfth determining module, configured to determine that the first data frame does not satisfy the preset condition if it is determined that a clock frequency offset of the first data frame is not within the preset range;

And a thirteenth determining module, configured to modify a clock frequency offset of the first data frame, so that a clock offset of the modified first data frame is within the preset range.
The site according to claim 11 or 12, wherein the site further comprises:

a first self-vibrating unit for generating a clock by self-oscillation;

a fourth determining unit, configured to determine that the clock generated by the self-oscillation of the station is a target clock, where the target clock is used to indicate that the downstream station does not perform protection switching;

The second modifying unit is configured to replace the clock of the second data frame with the target clock.
The site according to claim 11 or 12, wherein the site further comprises:

a second self-vibrating unit, configured to generate a periodic frame header by self-oscillation;

a fifth determining unit, configured to determine that the frame header of the static vibration of the station is a target frame header, where the target frame header is used to indicate that the downstream site does not perform protection switching;

The second modifying unit is configured to replace a frame header of the second data frame with the target frame header.
The site according to claim 11 or 12, wherein the site further comprises:

a sixth determining unit, configured to detect that the switching indication information used to indicate the switching of the downstream station is set in the overhead of the second data frame, and modify the switching indication information, so that the modified information is modified. The switching indication information is used to indicate that the downstream station does not perform protection switching;

a seventh determining unit, configured to determine that the overhead of the modified switching indication information is set as a target overhead;

The second modifying unit is configured to replace the overhead of the second data frame with the target overhead.
A system, comprising: a client service sender for transmitting a service signal; and a client service receiver for receiving the service signal, and the client service sender and the client service receiver are connected in series There are a plurality of stations as claimed in any one of claims 11 to 20.