WO2012012997A1

WO2012012997A1 - Service looping method and device for synchronous digital system

Info

Publication number: WO2012012997A1
Application number: PCT/CN2010/079616
Authority: WO
Inventors: 杜强
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-07-27
Filing date: 2010-12-09
Publication date: 2012-02-02
Also published as: CN101895362A

Abstract

A service looping method for synchronous digital system is provided in the present invention, the method includes: an access unit accesses the service; the service is looped to the access unit via a crossing unit. A service looping device for synchronous digital system is also provided in the present invention, the device comprises: an access unit, used to access the service; a crossing unit, used to loop the service to the access unit. The present invention enables the looping operation for all level services.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a service loopback method and apparatus for synchronizing a digital system. BACKGROUND In the digital synchronization system, loopback, as a means of fault location, plays an important role in network maintenance, and can quickly locate fault points through various levels of loopback. The service crossover process is as follows: Different access units are distinguished according to the port rate, and the access unit sends the services supported by the service switching backplane bus to the cross unit for crossover, and then sends the service to the access unit after the crossover. Currently, the service loopback function is implemented in the access unit. The rate of processing of the general access unit is 155M, 622M, 2.5G, 10G. These rates may be due to multi-level rate multiplexing. For example, a 155M rate may consist of 63 2M, or it may be composed of 3 45M. The inventor has found that the access unit only processes the information of the regenerator section, the multiplex section and the AU4/AU3, and the lower level information of the multiplex section is transparently transmitted, that is, the access unit cannot identify the low-level service information. Therefore, one method of the related art is to set only the AU3/AU4 level ij when setting the loopback, and does not provide a loopback channel for the low-level service information. This has certain limitations. If you access a lower-level service, there is no way to perform a loopback operation. Another method of the related art is to separate all services at the same time without distinguishing the service level, which occupies a large bandwidth and processing capability, and affects other services. SUMMARY OF THE INVENTION A main object of the present invention is to provide a service loopback method and apparatus for synchronizing a digital system, so as to solve the problem that the loopback cannot be performed on a top-level service in the related art. In order to achieve the above object, according to an aspect of the present invention, a service loopback method for synchronizing a digital system is provided, including: an access unit access service; and a loopback service to an access unit by a cross unit. In order to achieve the above object, according to another aspect of the present invention, a service loopback apparatus for a synchronous digital system is provided, including: an access unit, configured to access a service; and a cross unit, configured to receive a loopback service Enter the unit. The present invention implements a loopback operation by using a cross-unit, because the cross-unit can identify all levels of services, and thus solves the problem that the loopback service cannot perform loopback on low-level services due to transparent transmission of the service at the access level. This enables loopback operations to be performed on all levels of business. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of an apparatus for a service loopback method for synchronizing a digital system according to an embodiment of the present invention; FIG. 2 is a service loopback method for synchronizing a digital system according to a preferred embodiment of the present invention; FIG. 3 is a flowchart of a service loopback method for synchronizing a digital hierarchy according to a preferred embodiment of the present invention; FIG. 4 is a diagram of a method for synchronizing a traffic loopback method of a digital system according to a preferred embodiment of the present invention; schematic diagram. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. 1 is a schematic diagram of an apparatus for a service loopback method for synchronizing a digital system according to an embodiment of the present invention, where the service loopback method includes but is not limited to the following processing: access unit 10 accesses a service; 20 loops back to the access unit 10. The access unit of the related art processes only the information of the regenerator section, the multiplex section and the AU4/AU3, and the low-level information of the cascading level is transparently transmitted, that is, the access unit cannot identify the low-level service information. Therefore, one method of the related art is to set only the AU3/AU4 level when setting the loopback. Loopback channels are not provided for low-level business information. In this embodiment, the loopback operation is performed by using the cross-unit, because the cross-unit can identify all levels of services, thereby solving the problem that the low-level service in the related art cannot perform loopback on the low-level service due to transparent transmission on the access unit. , thus implementing loopback operations for all levels of business. 2 is a schematic diagram of an apparatus for synchronizing a service loopback method of a digital system according to a preferred embodiment of the present invention. As shown in FIG. 2, the access unit 10 transmits traffic to the space division cross unit 22 in the cross unit 20; The sub-intersection unit 22 transmits the traffic to the time division cross unit 24 in the cross unit 20; the time division cross unit 24 transmits the traffic to the access unit 10. Since the cross unit usually includes a space division cross unit and a time division cross unit, the access unit is connected to the time division cross unit through the space division cross unit, so this embodiment can be better applied to most occasions. Preferably, the time division cross unit that transmits the service to the cross unit by the space division intersection unit includes but is not limited to the following processing: the space division intersection unit receives the loopback command; determines whether the channel of the space division intersection unit is idle; if idle, The channel of the space division cross unit is configured with time slots to transfer traffic to the time division cross unit. Preferably, determining whether the channel of the space division intersecting unit is idle includes, but is not limited to, the following processing: determining whether the channel has been configured to transmit a time slot of a service of a level other than the level of the service; if it is already configured, determining the channel Busy; otherwise it is determined that the channel is idle. Preferably, the time division cross unit transmits the service to the access unit, including but not limited to the following: determining whether the channel of the time division cross unit is idle; if idle, configuring the time slot for the channel of the time division cross unit to transmit the service to the access unit. Preferably, determining whether the channel of the time division cross unit is idle includes but is not limited to the following processing: determining whether the channel has been configured to transmit a time slot of a service of a level other than the level of the service; if it is already configured, determining that the channel is busy ; otherwise it is determined that the channel is idle. The above embodiment is simple and easy to avoid conflict with other existing services. Preferably, the level of service includes, but is not limited to, at least one of the following levels: 'j: AU3, AU4, TU12,

TU11, TUG3. Since the cross unit can recognize these levels of communication, the present embodiment implements a loopback operation for the class-level service. In a preferred embodiment of the present invention, an optical transmission system device based on a synchronous digital system provides time slot intersections of AU4, TUG3, TU12, TU11, etc., wherein AU4 is high. Levels of business, TUG3, TU12 and TUll are low-level services. The access unit can directly provide the loopback function of the AU4 level. That is, the loopback operation of the high-level service can be directly performed on the access unit. For example, the cross unit does not set any time slot, and it is necessary to configure a TU12 channel of the access unit 10, such as the Nth TU12 channel. After receiving the loopback command, the space division intersecting unit 22 determines whether there are other timeslots configured, that is, whether there is a configuration of a high-level service, and if there is no configuration, it is determined whether the access unit 10 and the time division intersecting unit 24 The connection is established. In the case where there is no connection configuration, the new access unit 10 is configured by the space division crossing unit 22 to the time slot of the time division intersection unit 24, and the loopback channel at this time is saved to the space division cross slot library. When it is required to loop back to the service of the higher-level service, it is necessary to configure a time slot channel that can transmit a lower-level service. At this time, it is judged whether or not the time slot configuration of the branch of the intersection unit 24 to the exit of the time-division cross-unit 24 is sometimes configured, without configuration. The time slot configuration of the Nth TU12 channel of the new time division cross unit 24 to the exit of the time division cross unit 24 is saved to the time division cross slot library. After the above process is completed, the contents of the space division cross-slot library and the time-division cross-slot library are sent to the driver and written into the chip. At this time, a low-order loopback configuration of the TU12 channel is completed, and the service is accessed from the optical access unit 1. The Nth TU12 channel is accessed, and is transmitted from the Nth TU12 channel of the optical access unit after space division crossing and time division. The implementation process of implementing the loopback function and implementing the selection and conversion of the slot channels while the above preferred embodiment implements the loopback function will be described below. 3 is a flow diagram of a service loopback method for a synchronous digital hierarchy in accordance with a preferred embodiment of the present invention. FIG. 4 is a schematic diagram of an apparatus for synchronizing a traffic loopback method of a digital hierarchy in accordance with a preferred embodiment of the present invention. As shown in FIG. 3, the service loopback method includes the following steps: Step S301: The command receiving module receives the loopback command. Before this step, the system device creates a buffer to save the current time slot configuration, that is, saves the time slot path of the current service data transmission, and the path is a non-loopback transmission path, and path 1 in the port diagram 4. The current time slot at jtb is 12->10. Step S302, the command is parsed. The current command type is judged. If it is a loopback command, the process goes to step S303. If it is a time slot configuration command, the process proceeds to step 4, S307. Step 4 gathers S303 to determine whether the channel between the access unit 10 and the space division crossing unit 22 has other levels of time slots. In this step, the channel that needs to be looped back is determined according to the current time slot, and other levels of services, such as TUG3 and TU 11, are returned. If yes, the path of the high priority configuration is returned. If not, step S304 is performed. In step S304, it is determined whether the access unit 10 and the time division cross unit 24 establish a connection. In this step, it is determined whether the time division cross unit 24 of the channel in which the time slot of the loopback is required to establish a connection with the access unit 10 according to the current time slot. If yes, the process proceeds to step S305, otherwise, the process proceeds to step S306. Step S305, the loopback information is saved, and the loopback information is sent to the slot decision module, and the process proceeds to step S308. Step S306, adding the connection time slot of the access unit 10 to the time division cross unit 24. In this step, the connection time slot of the time division crossing unit 24 and the space division intersection unit 22 of the loopback loop is added to the time slot library, corresponding to the time slot 2 and the time slot 5 in FIG. 4, and the process proceeds to step 4 S305. Step S307, the slot information is saved, and the slot information is sent to the slot decision module to proceed to step S308. Step S308, the decision module makes a decision. Specifically, the time slot decision module performs decision according to the loopback information and the current time slot information, if the loopback information has a configured time slot. Step S309, determining whether the loopback information has been configured with a time slot. If the loopback information has a configured time slot, the process proceeds to step S310, otherwise, the process proceeds to step S311. Step S310, 4: The time slot channel number is equal to the time slot channel number, and the time slot channel transmits the loopback information, that is, performs a loopback operation on the service. Step S311, adding a time slot configuration to the time slot library, so that the channel number of the incoming time slot is the same as the channel number of the outgoing time slot, that is, the channel number is the channel number that needs to be looped back, and the channel is the time slot for performing the service loopback operation. aisle. After step S310 and step S311 are completed, the process proceeds to step S312. Step S312, configuring the chip. In this step, the time slot decision module sends the determined information to the driver to complete the loopback function. The preferred embodiment of FIG. 3 first creates a buffer to hold the current time slot configuration, which is configured as the channel 1 between the access unit 12 and the space division intersection unit, and between the channel 1 and the space division intersection unit and the time division intersection unit. Channel 2, channel 2 to channel 3 of the time division unit, channel 3 to channel 4 between the space division intersection unit and the time division intersection unit, channel 4 to channel 5 of the space division intersection unit, and channel 5 to the access unit 10. Secondly, after the system receives the loopback command (such as configuring the service TU12 of the access unit 10 to perform loopback), it is determined whether the channel 3 is configured with other levels of time slots, such as TUG3, TU11, etc., in the judgment that there is no such In the case of a level slot, it is determined whether the access unit 10 establishes a connection with the channel 6 of the space division intersection unit according to the current time slot, and if not established, the connection is increased. The channel 8 of the channel 6 and the time division cross unit and the connection time slot of the access unit 10 are connected to the time slot library, and the loopback information is sent to the time slot decision module, and the time slot decision module makes a decision according to the loopback information and the current time slot information. , configured as channel 6 of access unit 10 to space division intersection unit, channel 6 to channel 7 between space division intersection unit and time division intersection unit, channel 7 to channel 8 of time division intersection unit, channel 8 to space division intersection unit The channel 4 between the time division unit and the channel 4, the channel 4 to the channel 5 of the space division unit, and the channel 5 to the access unit 10. The time slot decision module sends the determined information to the driver, and configures the chip to complete the loopback function. The channel between the space division intersecting unit 22 and the time division intersecting unit 24 is hardwired. Preferably, the access unit is an optical interface board, and the air separation cross unit and the time division cross unit are integrated into the cross board, or are independent air separation cross boards and time division cross boards. In this embodiment, the dual-page function of the time-division chip of the cross-board is used to change only the channel service flow that needs loopback processing, other services are not affected, and abnormal conditions are judged, and the use of the engineering maintenance is safe and reliable. It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different than that herein. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

A service loopback method for synchronizing a digital system, comprising:

Access unit access service;

The service is looped back to the access unit by a cross unit. The method according to claim 1, wherein the looping back the service to the access unit by the cross unit comprises:

The access unit transmits the service to a space division cross unit in the cross unit;

The space division intersecting unit transmits the traffic to a time division cross unit in the cross unit; the time division cross unit transmits the service to the access unit. The method according to claim 2, wherein the space division cross unit that transmits the service to the cross unit comprises:

The space division intersecting unit receives a loopback command;

Determining whether the channel of the space division crossing unit is idle;

If idle, a time slot is allocated to the channel of the space division intersection unit to communicate the traffic to the time division intersection unit. The method according to claim 3, wherein determining whether the channel of the space division intersecting unit is idle comprises:

Determining whether the channel has been configured to transmit time slots of other levels of traffic other than the level of the service;

If it is already configured, it is determined that the channel is busy; otherwise it is determined that the channel is idle. The method according to claim 2, wherein the time division cross unit transmits the service to the access unit comprises:

Determining whether the channel of the time division cross unit is idle; If idle, a time slot is configured for the channel of the time division cross unit to transmit the service to the access unit.

The method according to claim 5, wherein determining whether the channel of the time division cross unit is idle comprises:

If it is already configured, it is determined that the channel is busy; otherwise it is determined that the channel is idle.

The method according to any one of claims 1-6, wherein the level of the service comprises at least one of the following levels: AU3, AU4, TU12, TU11, TUG3.

8. A service loopback device for synchronizing a digital system, comprising:

An access unit, configured to access services;

And a cross unit, configured to loop back the service to the access unit.

9. The apparatus according to claim 8, wherein the intersection unit comprises: a space division intersection unit and a time division intersection unit;

The access unit is configured to transmit the service to a space division cross unit in the cross unit;

The space division crossing unit is configured to transmit the service to a time division intersection unit in the intersection unit;

The time division cross unit is configured to transmit the service to the access unit.

The device according to claim 9, wherein the access unit is an optical interface board, and the space division intersecting unit and the time division cross unit are integrated into a cross board, or are independent air points respectively. Cross board and time division cross board.