CN109889257B - Method for realizing service bidirectional interruption based on OTN overhead - Google Patents
Method for realizing service bidirectional interruption based on OTN overhead Download PDFInfo
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- CN109889257B CN109889257B CN201910008162.2A CN201910008162A CN109889257B CN 109889257 B CN109889257 B CN 109889257B CN 201910008162 A CN201910008162 A CN 201910008162A CN 109889257 B CN109889257 B CN 109889257B
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Abstract
The invention discloses a method for realizing service bidirectional interruption based on OTN overhead, which comprises the following steps: monitoring the quality defect of the service signal in real time; the board card of the upstream bearing service fills corresponding defect state information in APS bytes of the service according to a G.709 protocol according to the quality defect of the service signal monitored in real time; the defect state information comprises a service signal quality defect state and a non-service signal quality defect state; detecting defect state information corresponding to APS bytes of received forward services by a board card of the downstream bearing services, switching off or switching on a laser of a corresponding downstream service port according to the defect state information, and inserting the defect state information consistent with the forward services into the APS bytes of the reverse services; and the board card of the upstream bearing service detects the defect state information of APS bytes of the received reverse service, and switches off or switches on the laser of the upstream corresponding service port according to the defect state information. The fault detection method is quick and simple, easy to realize, high in reliability and easy to maintain.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a method for realizing service bidirectional interruption based on OTN overhead.
Background
When an OTN (Optical Transport Network) device is intercommunicated with a client-side device such as an SDH (Synchronous digital hierarchy), a PTN (Packet Transport Network), a router, etc., services in both the lower and upper directions are required to travel the same path, which requires that when a service in one direction fails, the OTN device and the client-side device need to ensure that the service in the other direction can be cut off at the same time.
In the existing network, there are a plurality of small particle services such as FE (Fast Ethernet, gigabit Ethernet), GE (Giga Bit Ethernet, gigabit Ethernet interface), 1GFC (1G fiber Channel ), etc., besides the standard ODU0 (optical Channel data unit ODUk, where k is 0) mapping, there are also a large number of devices using other mapping methods, for example, a device directly encapsulated and mapped to an OPU1 (optical Channel payload unit OPUk, where k is 1) by a GFP (Generic Framing Procedure) protocol, and then mapped to an ODU1 Channel signal, the overhead of the ODU1 cannot indicate the status of a certain small particle service contained in the ODU1, and when the small particle service fails, bidirectional service disconnection cannot be triggered.
In summary, in order to solve the problem of coexistence of multiple mapping modes of small-granule services in the existing network, it is urgently needed to provide a uniform, simple and feasible service bidirectional disconnection scheme to ensure that a service bidirectional disconnection can be triggered when a small-granule service of any level fails.
Disclosure of Invention
The technical problem to be solved by the invention is to design a bidirectional disconnection scheme which effectively reduces cost and is easy to realize aiming at the problem that the existing service protection method can not be compatible with multiple mapping modes of multiple services on the existing network at the same time so as to ensure that the service bidirectional disconnection can be triggered when any level of small-particle service fails.
In order to solve the above technical problem, the technical solution adopted by the present invention is to provide a method for implementing bidirectional service disconnection based on OTN overhead, comprising the following steps:
s101, monitoring the quality defect of a service signal in real time;
step S102, a board card of an upstream bearer service fills corresponding defect state information in APS bytes of the service according to a G.709 protocol according to the service signal quality defect monitored in real time;
the defect state information comprises a service signal quality defect state and a non-service signal quality defect state;
step S103, detecting defect state information corresponding to APS bytes of received forward services by a board card of the downstream bearing services, turning off or turning on a laser of a corresponding downstream service port according to the defect state information, and inserting the defect state information consistent with the forward services into the APS bytes of the reverse services;
and step S104, detecting the defect state information of the APS byte of the received reverse service by the board card of the upstream bearer service, and turning off or turning on the laser of the upstream corresponding service port according to the defect state information.
In the above method, the service signal quality defect includes a signal failure alarm SF and a signal degradation alarm SD in the OTN overhead.
In the method, when the quality defect of the service signal is monitored, the quality defect state of the service signal is filled in the APS byte of the forward service;
when all the monitored service signal quality defects disappear, filling the APS bytes of the forward service with a state without the service signal quality defects;
in the above method, when multiple different services are mapped into the same ODU1, the defect state information of each service occupies one time slot TSi, and each time slot TSi occupies 2 bits of an APS byte.
In the above method, the APS byte comprises 4 bytes;
the first four bits of the 1 st byte are top-level request or status bytes, which reflect the condition, command or status of protection priority; the last four bits of the 1 st byte are protection type bytes and are unidirectional protection or bidirectional protection;
In the method, if a downstream service-bearing board card detects that the defect state information of the APS byte of the forward service is a service signal quality defect state, a laser of a corresponding downstream service port is switched off, and the service signal quality defect state is inserted into the APS byte of the reverse service;
if the downstream board card bearing the service detects that the defect state information of the APS byte of the forward service is in a service signal quality defect-free state, the laser of the corresponding downstream service port is opened, and the service signal quality defect-free state is inserted into the APS byte of the reverse service.
In the method, if the board card of the upstream bearing service detects that the defect state information of the APS byte of the reverse service is a service signal quality defect state, the laser of the service port corresponding to the upstream is switched off;
and if the board card of the upstream bearing service detects that the defect state information of the APS byte of the reverse service is in a service signal quality defect-free state, the laser of the service port corresponding to the upstream is opened.
In the above method, a traffic signal quality defect state is indicated by different values respectively used on corresponding APS bytes of the forward traffic and the reverse traffic.
In the method, if the setting of the forward service indicating the service signal quality defect state is O1, the service signal quality defect-free state is 00; the reverse service indicates that the state with the service signal quality defect is set to be 11, and indicates that the state without the service signal quality defect is 00;
when detecting that the value of the time slot TSi corresponding to the APS byte of the forward service is 01, the station fills 11 the position of the corresponding time slot TSi in the APS byte of the reverse service; when the station detects that the time slot TSi value corresponding to the APS byte of the forward service is 00, the same value 00 is filled in the corresponding time slot TSi position in the APS byte of the reverse service.
Compared with the prior art, the invention inserts the service signal quality defect detected at the upstream into the APS byte in a state information mode, then determines whether the upstream has the service signal quality defect by detecting the APS byte at the downstream, and when the service signal quality defect occurs, the laser of the downstream corresponding service port is switched off, and simultaneously, the laser of the upstream corresponding service port is switched off after the APS byte is inserted into the service signal quality defect state information, so that the service signal quality defect can be detected only in the upstream board service port mapping direction, even if a plurality of service types and a plurality of service mapping encapsulation modes exist, the service bidirectional disconnection of the service can be completed by switching off the laser as long as the downstream service board demapping direction detects the APS byte state information in the ODU1, the service quality defect of the upstream board can be judged, and the service bidirectional disconnection can be completed by switching off the laser, the method is suitable for various encapsulation forms of various services, particularly for the mapping encapsulation of various small particle services into one ODU1, and has the advantages of quick and simple fault detection mode, easy realization, low cost, high reliability and easy maintenance.
Drawings
Fig. 1 is a flowchart of a method for implementing bidirectional service disconnection based on OTN overhead according to the present invention;
FIG. 2 is a schematic diagram of multiple services employing multiple encapsulations in accordance with the present invention;
FIG. 3 is a schematic diagram of a business bidirectional interrupt of the present invention;
fig. 4 is a schematic diagram of an APS byte structure in the present invention.
Detailed Description
The invention provides a bidirectional breaking method which effectively reduces the cost and is easy to realize, can effectively improve the stability of equipment and is convenient to maintain. The invention is described in detail below with reference to the drawings and the detailed description.
As shown in fig. 1, the method for implementing bidirectional service disconnection based on OTN overhead provided by the present invention includes the following steps:
step S101, monitoring service signal quality defects in real time, namely monitoring SF (signal failure) and SD (signal degradation) alarms in OTN overhead in real time;
step S102, the upstream board card that carries the service fills corresponding defect status information in the corresponding APS byte (automatic protection switching path byte) according to the g.709 protocol according to the service signal quality defect monitored in real time, and sends the defect status information to the downstream board card that carries the service.
The defect state information comprises a service signal quality defect state and a non-service signal quality defect state;
when the quality defect of the service signal is monitored, filling the APS byte of the forward service with a quality defect state of the service signal;
when all the monitored service signal quality defects disappear, filling the APS bytes of the forward service with a state without the service signal quality defects;
fig. 2 is a schematic diagram of multiple services adopting multiple packages, as shown in fig. 2, multiple different services may be mapped into the same ODU1, defect state information of each service occupies one time slot TSi, and each time slot TSi occupies 2 bits of APS bytes.
Fig. 3 is a schematic diagram of implementing service bidirectional interruption based on OTN overhead provided by the present invention, and fig. 4 is a schematic diagram of an APS byte structure in the present invention. As shown in fig. 3 and 4, an APS byte has 4 bytes, and the first four bits of the 1 st byte are top-level request or status bytes, which reflect the condition, command or status of protection priority; the last four bits of the 1 st byte are protection type bytes, and the protection types comprise one-way protection and two-way protection; bytes 2 to 4 are defect state information filling bytes, since the defect state information of each service occupies one time slot TSi and each time slot TSi occupies 2 bits, the APS byte of each ODUk can be used by 12 time slots TSi (i.e., defect state information of 12 services can be filled), and when a service port of an OTU (Optical Channel Transport Unit) service board a detects a service signal quality defect such as SF or SD alarm, a service signal quality defect state 01 is filled in the time slot TSi position corresponding to the APS byte; and when the service port does not detect service signal quality defects such as SF or SD alarm and the like, filling the state 00 without the service signal quality defects in the TSi time slot position corresponding to the APS bytes.
Step S103, the board card of the downstream bearer service detects the defect state information of the APS byte of the received forward service, turns off or opens the laser of the corresponding downstream service port according to the defect state information, inserts the defect state information consistent with the forward service into the APS byte of the reverse service, and sends the defect state information to the board card of the upstream bearer service;
if the downstream board card bearing the service detects that the defect state information of the APS byte of the forward service is in a service signal quality defect state, indicating that the service has a defect, the laser of the corresponding downstream service port is switched off, so that the service of the equipment port connected with the service port of the board card is interrupted, and simultaneously, the same defect state information, namely the service signal quality defect state, is inserted into the APS byte of the reverse service according to the detected defect state information of the received APS byte;
if the downstream board card bearing the service detects that the defect state information of the APS byte of the forward service is in a non-service signal quality defect state, indicating that the service is normal, the laser of the corresponding downstream service port is opened, and the same defect state information, namely the non-service signal quality defect state, is inserted into the APS byte of the reverse service according to the detected and received APS byte defect state information.
As shown in fig. 3 and 4, the downstream OTU service board B detects defect state information of the received APS byte, and if the value of the corresponding time slot TSi is 01, the defect state information is a service signal quality defect state, which indicates that there is an alarm on the upstream service port, and the forward laser turn-off function is in an activated state, then the service corresponding to the board carrying the service on the downstream side turns off the laser. In addition, the service sent by the board card carrying the service at the upstream to the board card carrying the service at the downstream is a forward service; the service sent by the board card of the downstream bearing service to the board card of the upstream bearing service is a reverse service; for distinguishing the defect state information of the forward and reverse traffic, different values are adopted in two directions to indicate the state with the defect of the quality of the traffic signal, for example, when the station detects that the value of the time slot TSi corresponding to the APS byte of the received traffic is 01, the station indicates the state with the defect of the quality of the traffic signal, and the station fills the position of the time slot TSi corresponding to the APS byte of the reverse traffic with the value 11 indicating the state with the defect of the quality of the traffic signal; when the station detects that the value of the time slot TSi corresponding to the APS byte of the received service is 00, it indicates that there is no service signal quality defect, and the station fills the same value 00 in the position of the corresponding time slot TSi in the APS byte of the reverse service.
Step S104, the board card of the upstream bearer service detects the defect state information of the APS byte of the received reverse service, and turns off or turns on the laser of the upstream corresponding service port according to the defect state information, so that the service of the equipment port connected with the service port of the board is interrupted or recovered.
If the board card of the upstream bearing service detects that the defect state information of the APS byte of the reverse service is in a service signal quality defect state, the laser of the service port corresponding to the upstream is switched off, so that the service of the equipment port connected with the service port of the board is interrupted;
if the board card of the upstream bearing service detects that the defect state information of the APS byte of the reverse service is in a service signal quality defect-free state, the laser of the service port corresponding to the upstream is opened, so that the whole service channel can be recovered to work normally.
As shown in fig. 3 and 4, the upstream OTU service board a detects APS byte defect status information of a received reverse service, and if the value of the corresponding time slot TSi is 11 and the reverse laser turn-off function is in an active state, the service corresponding to the upstream OTU service board a turns off the laser, so that the lasers of the service ports corresponding to the two directions are turned off through the above steps, and the service interruption of the docking device is realized, thereby completing the whole service switching action.
For different service mapping and encapsulating modes, especially for mapping and encapsulating multiple types of small-particle services into one ODU1, since a service processing chip used by some OTU devices cannot detect a service signal quality defect in a demapping direction, it is impossible to trigger the laser of a corresponding service port to turn off. In the invention, the service signal quality defect can be detected only by the upstream board card service port mapping direction, even if multiple service types and multiple service mapping and packaging modes exist, the downstream service board card demapping direction can judge whether the upstream board card service has the service signal quality defect by detecting the APS byte state information in the ODU1, and then the service bidirectional disconnection is completed by switching off the laser.
The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
Claims (7)
1. A method for realizing service bidirectional interruption based on OTN overhead is characterized by comprising the following steps:
s101, monitoring the quality defect of a service signal in real time;
step S102, a board card of an upstream bearer service fills corresponding defect state information in APS bytes of the service according to a G.709 protocol according to the service signal quality defect monitored in real time;
the defect state information comprises a service signal quality defect state and a non-service signal quality defect state;
step S103, detecting defect state information corresponding to APS bytes of received forward services by a board card of the downstream bearing services, turning off or turning on a laser of a corresponding downstream service port according to the defect state information, and inserting the defect state information consistent with the forward services into the APS bytes of the reverse services;
step S104, the board card of the upstream bearer service detects the defect state information of APS bytes of the received reverse service, and the laser of the upstream corresponding service port is switched off or opened according to the defect state information;
when the quality defect of the service signal is monitored, filling the APS byte of the forward service with a quality defect state of the service signal;
when all the monitored service signal quality defects disappear, filling the APS bytes of the forward service with a state without the service signal quality defects;
when multiple different services are mapped into the same ODU1, the defect state information of each service occupies one time slot TSi, and each time slot TSi occupies 2 bits of an APS byte.
2. The method of claim 1, wherein the service signal quality defect comprises a signal failure alarm SF and a signal degradation alarm SD in the OTN overhead.
3. The method of claim 1, wherein the APS byte comprises 4 bytes;
the first four bits of the 1 st byte are top-level request or status bytes, which reflect the condition, command or status of protection priority; the last four bits of the 1 st byte are protection type bytes and are unidirectional protection or bidirectional protection;
bytes 2 to 4 are defect state information filling bytes, and the APS byte of each ODUk is used for 12 time slots TSi to fill defect state information of 12 services.
4. The method according to claim 1, wherein if a downstream service-bearing board card detects that the defect status information of APS bytes of the forward service is a service signal quality defect status, the laser of the corresponding downstream service port is turned off, and a service signal quality defect status is inserted into APS bytes of the reverse service;
if the downstream board card bearing the service detects that the defect state information of the APS byte of the forward service is in a service signal quality defect-free state, the laser of the corresponding downstream service port is opened, and the service signal quality defect-free state is inserted into the APS byte of the reverse service.
5. The method according to claim 1, wherein if the board card of the upstream bearer service detects that the defect status information of the APS byte of the reverse service is a service signal quality defect status, the laser of the service port corresponding to the upstream is turned off;
and if the board card of the upstream bearing service detects that the defect state information of the APS byte of the reverse service is in a service signal quality defect-free state, the laser of the service port corresponding to the upstream is opened.
6. The method of claim 1, wherein the service quality defect status is indicated by different values respectively used for corresponding APS bytes of the forward service and the reverse service.
7. The method of claim 6, wherein if the forward traffic indicates the traffic signal quality defect status is set to O1, the traffic signal quality defect status is 00; the reverse service indicates that the state with the service signal quality defect is set to be 11, and indicates that the state without the service signal quality defect is 00;
when detecting that the value of the time slot TSi corresponding to the APS byte of the forward service is 01, the station fills 11 the position of the corresponding time slot TSi in the APS byte of the reverse service; when the station detects that the time slot TSi value corresponding to the APS byte of the forward service is 00, the same value 00 is filled in the corresponding time slot TSi position in the APS byte of the reverse service.
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| CN1983931A (en) * | 2006-04-05 | 2007-06-20 | 华为技术有限公司 | Method and system for transmitting fault information in light network |
| CN101944950A (en) * | 2009-07-06 | 2011-01-12 | 中兴通讯股份有限公司 | Processing method and device for loading extra service in optical transport network (OTN) |
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