WO2007076700A1

WO2007076700A1 - A multiple service separated fiber synchronization digital transmission network transmission device and transmission method

Info

Publication number: WO2007076700A1
Application number: PCT/CN2006/003693
Authority: WO
Inventors: Xinghua Li; Huiqing Yao
Original assignee: Zte Corporation
Priority date: 2005-12-30
Filing date: 2006-12-29
Publication date: 2007-07-12
Also published as: CN1992571B; CN1992571A

Abstract

A transmission device and transmission method for transmitting multiple service in fiber synchronization digital transmission network, the transmission device includes across system (200) and one or more multiple service sub-system (300), the said across system (200) completes the service across allocation among the traditional fiber synchronization digital transmission network branch access, light path access and multiple service sub-system (300) access, the said multiple service sub-system (300) is connected to the bridging module (206) of the across system (200) to complete the access, procession and transmission of the multiple data service of the user. Using the said device of the invention, compared to the prior art, the invention provides a multiple service separated transmission device, spreads the uplink and downlink data service flow of the SDH/SONET device. The invention also can realize the connection between the user terminal device and SDH/SONET access device, simplify the configuration of the network, and reduce the cost of performance.

Description

Multi-service separated optical homonym digital transmission network transmission device and method

Technical field

The present invention relates to a transmission device in an optical synchronous digital transmission network, and more particularly to synchronous digital

. A transmission device and transmission method for multi-service transmission technology in the series/synchronous optical network (SDH/SONET) field.

Background technique

The data transmission of traditional telecommunication services is realized by streaming, and as the proportion of Internet and broadband services increases, data transmission is gradually implemented in a packet mode, that is, in a packetized manner. Under this trend, traditional SDH/SONET technology has been unable to adapt to the needs of new services, but from the application point of view, it is impossible to completely abandon the traditional SDH/SONET transmission network. MSTP (Multi-Service Transport Platform) technology is a technology that can utilize both traditional transmission networks and new business requirements. It is based on the traditional SDH/SONET platform, and implements multiple access, processing and transmission of TDM (Time Division Multiplexing) services, ATM (Asynchronous Transfer Mode) services, and Ethernet services, and provides unified network management multi-service nodes.

As an extension of SDH/SONET transmission technology, MSTP technology is currently embedded in SDH/SONET transmission equipment in the form of branch function modules. As shown in Figure 1, to achieve connectivity with end users, intermediate devices (such as Ethernet switch, DSLAM, etc.) are required, which increases network complexity and increases operating costs. At the same time, as applications continue to increase, embedded methods are also difficult to adapt to capacity expansion.

Summary of the invention

The technical problem to be solved by the present invention is to provide an SDH/SONET multi-service transmission transmission device and transmission method, which overcomes the shortcomings of the existing MSTP function module embedded in the SDH/SONET transmission device, and realizes the user terminal device and the transmission access device. Uniformity solves the problem that access bandwidth of access layer data services existing in the prior art is limited and MSTP is difficult to expand. The invention provides a transmission device for multi-service transmission of an optical synchronous digital transmission network, which comprises a cross system and one or more multi-service subsystems, wherein:

The cross system completes the cross-provisioning of services between the traditional optical synchronous digital transmission network branch access, the optical path access, and the multi-service subsystem access;

The multi-service subsystem is interconnected with the cross-system to complete access, processing, and transmission of multiple data services of the user.

The crossover system mainly includes a management module, a time slot cross module, a clock module, an optical interface module, and a bridge module. The management module is interconnected with all other modules, and the time slot cross module is respectively connected to the optical interface module and the bridge module. The clock module is respectively connected to the time slot cross module and the optical interface module, and the bridge module is interconnected with the multi-service subsystem through the optical fiber, where:

The management module completes the service configuration and performance monitoring of the multi-service subsystem through the time slot cross module in addition to the traditional general functions;

The time slot cross module not only completes the general function, but also transfers configuration management information between the management module and the multi-service subsystem;

The main function of the bridge module is to interconnect the multi-service subsystem with the time slot cross module.

The time slot cross module is composed of an active and spare time slot cross module, and only one module works at the same time, the module is called a working time slot cross module, and the bridge module is based on the primary backup of the time slot cross module. The status signal interconnects the multi-service subsystem with the working time slot cross module, and the management module completes the service configuration and performance monitoring of the multi-service subsystem through the working time slot cross module.

The cross system further includes a PDH tributary module, and the PDH tributary module respectively connects the time slot cross module, the management module and the clock module, and the PDH tributary module completes the access of the traditional PDH signal. The bridge module comprises a management sub-module, one or more selector sub-modules, one or more interface sub-modules connected one-to-one with the selector sub-module, the interface sub-modules and one or more multi-service sub-modules respectively System connection; wherein, the management sub-module monitors the performance of the bridge module, determines the working time slot cross module according to the status information of the active and standby time slot history fork modules, and then configures the selector sub-module; the selector sub-module is managed according to The configuration information of the sub-module, the working time slot crossing module is interconnected with the interface sub-module; the interface sub-module is mainly composed of the optical module device, and the photoelectric signal is completed. Conversion.

The multi-service subsystem includes a management sub-module, a system interface sub-module, a mapping sub-module, a media access control MAC layer sub-module, a service interface sub-module, and a clock sub-module, where:

The management sub-module is connected to the remaining sub-modules of the multi-service subsystem, and monitors the performance of the multi-service subsystem, and manages the service of the multi-service sub-system according to the service configuration information transmitted in the cross-system;

The system interface sub-module is connected to the mapping sub-module, and is connected to the crossover system through an optical fiber, and is mainly composed of an optical module device, and completes conversion of the photoelectric signal;

The mapping sub-module is connected to the MAC layer sub-module, and the module is a general sub-module, which performs encapsulation/de-encapsulation of multiple service data, mapping/demapping, and receiving and transmitting the transmission signal of the optical synchronous digital transmission network;

The MAC layer sub-module is connected to the service interface sub-module, and completes processing of the physical layer and the MAC layer signal of the service side signal;

The service interface sub-module provides an optical interface or an electrical interface, and multiple data services of the user are transmitted to the MAC layer sub-module through the sub-module;

The clock sub-module is connected to the mapping layer sub-module and the mapping sub-module, and receives the clock extracted by the mapping sub-module from the line, and provides a reference clock for the MAC layer sub-module and the mapping sub-module.

Further, the mapping sub-module extracts the service configuration information in the data communication channel DCC channel and transmits the service configuration information to the management sub-module; after the management sub-module completes the service configuration, the service configuration result information that needs to be reported to the cross-system is mapped. The submodule is inserted into the DCC channel.

The optical synchronous digital transmission network is an SDH/SON.ET network, and the DCC channel is D1-D12 bytes of the STM-N/STS-N signal segment overhead.

The invention provides a transmission method for multi-service transmission of an optical synchronous digital transmission network, which comprises the following steps:

(a) The NMS performs service configuration on the multi-service subsystem;

(b) After the service configuration is completed, the cross system and the multi-service subsystem perform uplink and downlink service transmission. When the service uplinks, the user service signal is encapsulated into STM-N/ST.SN signals by the multi-service subsystem, and the cross system will The STM-N/STS-N signal is crossed into the optical interface module. Transmission on the trunk of the SDH/SONET network;

When the service is downlinked, the optical interface module receives the STM-N/STS- signal from the SDH/SONET network, performs signal monitoring and sends it to the crossover system, and the crossover system cross-routes the signal to the multi-service subsystem. The system processes the signal and sends it to the user.

The step (a) further comprises the following steps:

(al) The network management system performs the service configuration, and sends the service configuration information to the management module of the cross-system; 2) after receiving the service configuration information of the network management system, the management module of the cross-system sends the service configuration information related to the multi-service subsystem to the work. Time slot crossing module;

( a3 ) The working time slot cross module inserts the service configuration information into the DCG channel of the multi-service subsystem, that is, into the D1-D12 bytes of the STM-N/STS-N segment overhead;

(a4) The STM-N/STS-N signal carrying the service configuration information reaches the system interface sub-module of the multi-service subsystem through the bridge module;

5) The mapping sub-module of the multi-service subsystem extracts the information in the D1-D12 bytes from the STM-N/STS-N signal of the downlink service, and forwards the information to the management sub-module of the multi-service subsystem;

6) The management sub-module of the multi-service subsystem sets the parameters of the multi-service sub-system according to the service configuration information;

( a7 ) After the configuration is complete, the management sub-module sends the configuration result information to the mapping sub-module;

(a8) the mapping sub-module inserts the configuration result information into the D1-D12 bytes of the uplink STM-N/STS-N signal segment overhead;

(a9) The management module of the cross system receives the configuration result information from the uplink STM-N/STS-N signal, indicating that the configuration is successful.

Compared with the existing SDH/SONET transmission equipment, the number of MSTP service boards is no longer limited by the rack, and the uplink and downlink data service traffic of the SDH/SONET equipment is expanded. At the same time, the user terminal equipment can be directly connected to the SDH/SONET access device, which not only simplifies the network structure, but also reduces operating costs.

BRIEF abstract Figure 1 is a schematic diagram of an existing SDH/SONET device;

1 is a schematic diagram of an SDH/SONET multi-service transmission transmission device of the present invention;

Figure 3 is a block diagram showing the structure of the bridge module in the crossover system shown in Figure 2;

Figure 4 is a block diagram of the structure of the multi-service subsystem shown in Figure 2;

Figure 5 is a flow chart of the SDH/SONET multi-service transmission and transmission method of the present invention;

6 is a schematic diagram of service configuration of a multi-service subsystem of the present invention. Preferred embodiment of the invention

The present invention takes an Ethernet service with a transmission bandwidth of 2.5G as an example to illustrate the structural composition and operation process of the SDH/SONET multi-service transmission transmission device.

2 is a schematic diagram of an SDH/SONET multi-service transmission transmission device of the present invention. Compared with the existing SDH/SONET device shown in Fig. 1, the present invention separates the multi-service transfer node (MSTP) function modules originally embedded in the SDH/SONET transmission device into one subsystem. The transmission device of the present invention is composed of two parts. The traditional SDH/SONET device is called a cross system 200, and the independent multi-service branch function module is called a multi-service subsystem 300. One or more multi-service subsystems can be included in a single transport device. The crossover system and the multiservice subsystem are interconnected by fiber optics.

The cross system 200 performs cross-provisioning of services between traditional SDH/SONET branch access, optical path access, and multi-service subsystem access. The main functional modules of the cross system 200 are: a management module 210, a time slot cross module 220, a clock module 230, an optical interface module 240, a PDH branch module 250 (optional), and a bridge module 260, where:

The management module 210 is interconnected with all other modules, and is mainly used for service configuration, device performance monitoring, network management interface, and communication functions between systems in the network. The above functions are common functions of the management module in the conventional SDH/SONET system. In addition, the management module through the cross slot module ²²⁰ to complete the multi-service subsystem service configuration and performance monitoring. There are many ways for the management module to exchange information with the time slot cross module, such as the Advanced Data Link Control (HDLC) protocol or the Serial Communication Controller (SCC) interface.

The time slot crossing module 220 is coupled to the two optical interface modules 240, the bridge module 260, and the PDH tributary module 250 (optional). The time slot crossing module 220 completes the intersection of services in all directions. In addition to the general functions such as fork provisioning, configuration management information between the management module 210 and the multi-service subsystem 300 is also passed. The time slot cross module 220 inserts the configuration management information from the management module 210 to the multi-service subsystem 300 into the DCC channel (data communication channel), that is, the STM-N/STS-N signal segment overhead. D1-D12 bytes Medium (just an example, the invention is not limited thereto), the STM-N/STS-N is an SDH/SONET signal associated with a multi-service subsystem. On the other hand, the time slot crossing module 220 extracts the D1~D12 byte information in the STM-N/STS-N signal from the multi-service subsystem, and sends the information to the management module 210, so that the management module 210 obtains the multi-service subsystem 300. Information. For the sake of business security, the time slot cross module can be composed of the main and spare time slot cross modules. At the same time, only one module is working. We call the working module as the working time slot cross module.

The clock module 230 is coupled to the time slot crossing module 220, the two optical interface modules 240, and the PDH tributary module 250 (optional), and is a time slot crossing module 220, two optical interface modules 240, and a PDH tributary module 250 ( Optional) Provide the system clock. The clock module can also be composed of active and standby clock modules, and only one module is working at the same time, which we call the working clock module.

The optical interface module 240 mainly performs functions such as photoelectric and electro-optical conversion, multiplexing and demultiplexing, frame and framing, segment and AU4 channel overhead extraction and insertion, pointer processing (adjustment) and generation. The number of optical interface modules is not limited to two in this embodiment.

The PDH tributary module 250 is interconnected with the time slot crossing module 220 and the clock module 230 to complete the access of the legacy PDH signal. .

The management module, the time slot cross module, the optical interface module, the clock module, and the PDH tributary module (optional) are common modules, which are respectively implemented by boards, integrated in a rack through the backplane, and passed through The backplane traces are interconnected. The bridge module 260 is interconnected with the time slot crossover module 220 and interconnected with the multi-service subsystem 300 via fiber optics. The bridge module 260 is a bridge for the multi-service subsystem 300 to communicate with the cross-system 200. The main function is to determine the working time slot cross-module according to the status signals of the primary time slot cross module and the spare time slot cross-module, and the multi-service The SDH/SONET signal of the subsystem is interconnected with the working time slot cross module. FIG. 3 is a structural block diagram of the bridge module 260. The bridge module 260 mainly includes a management submodule 310, a selector submodule 320, and an interface submodule 330, where:

The management sub-module 310 collects the result of the service performance detection by the selector sub-module 320, and monitors the performance of the bridge module. At the same time, according to the status information of the primary time slot cross module and the spare time slot cross module, which time slot is determined. The cross module is in operation, and then the selector submodule 320 is configured (the connection is omitted);

The selector sub-module 320 monitors the service performance of the active and standby time slot cross-module, and according to the configuration information of the management sub-module, selects the working time slot cross-module to be interconnected with the interface sub-module 330; the interface sub-module 330 and the selection The sub-module 320 is connected, and is mainly composed of an optical module device, and completes conversion of the photoelectric signal, and is connected to the multi-service subsystem through the optical fiber.

The bridge module can include one or more selector sub-modules and one or more interface sub-modules connected one-to-one with the selector sub-modules, which are each coupled to one or more multi-service subsystems.

Figure 4 shows the block diagram of the multi-service subsystem. The multi-service subsystem completes access, processing, and transmission of multiple data services of the user, and can complete various service signals such as Fast Ethernet, Gigabit Ethernet, ATM bearer, FC, ESCON, DVB, and STM-N/STS. -N signal conversion. The multi-service subsystem exchanges configuration information, operation status, user request information, and the like with the management module of the cross system through the DCC channel (i.e., D1-D12 bytes of the SDH/SONET signal mid-range overhead) by means of the time slot cross module of the cross system.

The multi-service subsystem is mainly composed of a management sub-module 410, a system interface sub-module 420, a mapping sub-module 430, a medium access control layer (MAC) sub-module 440, a service interface sub-module 450, and a clock sub-module 460, wherein:

The management sub-module 410 is connected to all the sub-modules (the connection is omitted in the figure), and is used to monitor the performance of the multi-service subsystem, and manage and configure the multi-service according to the service configuration information sent by the management module in the cross-system. Subsystem business. The service configuration information is obtained by the mapping sub-module extracting the D1-D12 byte information in the STM-N/STS-N and transmitting it to the entrant sub-module. Conversely, the management submodule will need to report the information to the cross system, through the mapping submodule, inserted into the D1~D12 bytes. The process is obtained by the time slot cross module of the working of the cross system and transferred to the management module of the cross system. The system interface sub-module 420 is connected to the bridge module of the cross system through an optical fiber, and is mainly composed of an optical module device, and completes photoelectric signal conversion.

The mapping sub-module 430 is connected to the clock module 460, the MAC layer sub-module 440, and the system interface sub-module 420, and is a general sub-module, which performs encapsulation/de-encapsulation, mapping/demapping, and SDH/SONET of various service data. Overhead processing (including D1~D12 byte extraction and insertion), receiving and transmitting STM-N/STS-N serial signals.

The MAC layer sub-module 440 is connected to the service interface sub-module 450, and performs physical layer and MAC layer signal processing of the service side signal, such as serial-to-parallel conversion, codec, data frame capture, performance statistics, or Layer 2 switching. . The service interface sub-module 450 provides an optical interface or an electrical interface, and various services such as Ethernet, F.C, etc. are connected to the multi-service subsystem through the interface.

The clock sub-module 460 is connected to the MAC layer sub-module 440 and the mapping sub-module 43.0. The receiving sub-module 430 receives the clock from the line as a reference, and provides a reference clock source for the MAC layer sub-module 440 and the mapping sub-module 430.

In an embodiment of the present invention, the service interface sub-module is composed of 20 100M Ethernet interfaces and can accept 20 Fast Ethernet service users. The MAC layer submodule is a Layer 2 Ethernet switch. In the upstream direction of the service, after the Ethernet signal is aggregated through the Layer 2 switch, the signal is transmitted to the mapping submodule. In the mapping to the module, the signal is encapsulated into an STM-16 signal. Conversely, in the downstream direction of the service, the STM-16 signal is demapped, decapsulated, and sent back to the user's Ethernet port through the Layer 2 switch. The system interface sub-module consists of a 2.5G optical module that performs photoelectric conversion of the signal. The optical module is connected to the interface submodule in the bridge module in the crossover system through an optical fiber. The interface submodule is mainly composed of a 2.5G optical module.

FIG. 5 is a schematic diagram of a service transmission method for SDH/SONET multi-service transmission according to the present invention, which mainly includes the following steps:

Step 1: The NMS performs service configuration on the multi-service subsystem.

Refer to the service configuration diagram shown in Figure 6. . Step 501: The network management system performs service configuration, and sends service configuration information to the management module of the cross system.

Step 502: After receiving the service configuration information of the network management system, the management module of the cross system sends the service configuration information related to the multi-service subsystem to the working time slot cross module;

Step 503: The working time slot cross module inserts the service configuration information into the DCC channel of the multi-service subsystem, that is, into the D1-D12 byte of the STM-16 segment overhead;

Since the STM-16 rate level is adopted between the bridging module and the multi-service subsystem in the present invention, the configuration information in the present invention is inserted into the STM-16 signal, and if other rate levels are used between the two, the STM-16 can also be Corresponding signals such as STM-N or STS-N.

D1-D12 is the overhead defined in the standard, and other overheads can be used. However, other overheads may be used to interwork with other equipment manufacturers.

Step 504: The STM-16 signal carrying the service configuration information reaches the system interface submodule of the multi-service subsystem through the bridge module.

Step 505: The mapping sub-module of the multi-service subsystem extracts the information in the D1-D12 bytes from the STM-16 signal of the downlink service, and forwards the information to the management sub-module of the multi-service subsystem.

Step 506: The management sub-module of the multi-service subsystem sets the parameters of the subsystem according to the service configuration information, such as the number of virtual concatenations of a certain channel, the encapsulation protocol, the virtual container type selection, etc.; Refers to a logical concept, such as the STM-1 frame structure, the smallest service particle that can be configured is VC12 (- 2M). If the user uses one VC12, this VC12 is a channel.

The parameters mentioned here are only part of the configuration of the system at work. For the system to work properly, the content to be configured is far more than these, and it is highly relevant to the business.

Step 507: After the configuration, the management sub-module sends the configuration result information to the mapping sub-module. Step 508: The mapping sub-module inserts the configuration result information into the D1-D12 bytes of the uplink STM-16 signal overhead;

Step 509: The management module of the cross system receives the configuration from the uplink STM-16 signal. Result information, indicating that the configuration is successful;

Step 2: After the configuration is completed, the cross system and the multi-service subsystem perform uplink and downlink service transmission.

Step 510: When the service uplinks, the service signal is encapsulated into a STM-16 signal by the multi-service subsystem, and the working time slot cross module in the cross system, the STM-16 signal from the multi-service subsystem is according to VC12/VC3. The time slot of /VC4 is crossed into the optical interface module and transmitted on the trunk line of the SDH network.

When the service is downlinked, the optical interface module receives the STM-16 signal from the SDH network, completes the signal monitoring and sends it to the crossover system. The crossover system completes the signal level cross-provisioning of the signal VC12/VC3/VC4, and then sends the signal through the STM-16 signal. For the multi-service subsystem, the multi-service subsystem completes the signal demapping, de-encapsulation, and the like and sends it to the user port.

Industrial applicability

Compared with the existing SDH/SONET transmission equipment, the number of MSTP service boards is no longer limited by the rack, and the uplink and downlink data service traffic of the SDH/SONET equipment is expanded. At the same time, the user terminal equipment can be directly connected to the SDH/SONET access device, which not only reduces the network structure, but also reduces the operating cost.

Claims

Claim

A transmission device for multi-service transmission of an optical synchronous digital transmission network, characterized in that it comprises a crossover system and one or more multi-service subsystems, wherein:

The cross system completes the cross-provisioning of services between the traditional optical synchronous digital transmission network branch access, optical access and multi-service subsystem access;

2. The transmission device according to claim 1, wherein: the intersection system mainly comprises a management module, a time slot intersection module, a clock module, an optical interface module, and a bridge module, wherein the management module is interconnected with all other modules. The time slot intersection module is respectively connected to the optical interface module and the bridge module, and the clock module is respectively connected to the time slot intersection module and the optical interface module, and the bridge module is interconnected with the multi-service subsystem through the optical fiber, where:

.

3. The transmission device according to claim 2, wherein: the interference slot module is composed of an active and spare time slot crossing module, and only one module operates at the same time, and the module is a working time slot crossing module. The bridge module interconnects the multi-service subsystem with the working time slot cross module according to the primary standby status signal of the time slot cross module, and the management module completes the service of the multi-service subsystem through the working time slot cross module Configuration and performance monitoring.

The transmission device according to claim 2 or 3, wherein: the cross system further comprises a PDH branch module, and the PDH branch module is respectively coupled to the time slot cross module, the management module and the clock module, and the PDH support module Complete the access of the traditional PDH signal.

5. The transmission device according to claim 3, wherein: the bridge module comprises a management submodule, one or more selector submodules, and one or more connected to the selector submodule. An interface sub-module, wherein the interface sub-module is respectively connected to one or more multi-service subsystems; wherein the management sub-module monitors the performance of the bridging module, and determines the working according to the status information of the main and spare time slot cross-modules The time slot cross module, and then the selector submodule is configured; the selector submodule selects the working time slot cross module to be interconnected with the interface submodule according to the configuration information of the management submodule; the interface submodule is mainly composed of the optical module device, and completes the photoelectric signal. Conversion.

6. The transmission device according to claim 1, wherein: said multi-service subsystem comprises a management sub-module, a system interface sub-module, a mapping sub-module, a medium access control MAC layer sub-module, a service interface sub-module, and a clock. Submodule, where:

The mapping sub-module and the MAC layer sub-module are a common sub-module, complete encapsulation/de-encapsulation, mapping/demapping of multiple service data, and receive and transmit transmission signals of the optical synchronous digital transmission network;

The MAC layer sub-module is connected to the service interface sub-module, and completes processing of a physical layer and a MAC layer signal of the service side signal;

The service interface sub-module provides an optical interface or an electrical interface, and multiple data services of the user are transmitted to the MAC layer sub-module through the sub-block; the clock sub-module and the MAC layer sub-module are connected to the mapping sub-module, and receive The clock extracted by the sub-module from the line provides a reference clock for the MAC layer sub-module and the mapping sub-block.

The transmission device according to claim 6, wherein: the mapping sub-module extracts service configuration information in a DCC channel of the data communication channel, and transmits the configuration information to the management sub-module; after the management sub-module completes the service configuration, The service configuration result information that needs to be reported to the cross system is inserted into the DCC channel by the mapping submodule.

8. The transmission device according to claim 7, wherein: the optical synchronous digital transmission network is an SDH/SONET network, and the DCC channel is an STM-N/STS-N signal segment overhead. D1-D12 bytes.

9. A transmission method for multi-service transmission of an optical synchronous digital transmission network, comprising the following steps:

(a) The NMS performs service configuration on the multi-service subsystem;

(b) After the service configuration is completed, the cross system and the multi-service subsystem perform uplink and downlink service transmission. When the service uplinks, the user service signal is encapsulated into STM-N/STS-N signals by the multi-service subsystem, and the cross system will The STM-N/STS-N signal is crossed into the optical interface module and transmitted on the trunk of the SDH/SONET network;

When the service is downlinked, the optical interface module receives the STM-N/STS-N signal from the SDH/SONET network, performs signal monitoring and sends it to the crossover system, and the crossover system cross-routes the signal to the multi-service subsystem. The subsystem processes the signal and sends it to the user.

10. The transmission method according to claim 9, wherein: the step (a) further comprises the following steps:

(al) The network management performs service configuration, and sends the service configuration information to the management module of the cross system;

(a2) After receiving the service configuration information of the network management, the management module of the cross system sends the service configuration information related to the multi-service subsystem to the working time slot cross module;

(a3) The working time P-crossing module inserts the service configuration information into the DCC channel of the multi-service subsystem, that is, into the D1-D12 bytes of the STM-N/STS-N segment overhead;

(a5) The mapping sub-module of the multi-service subsystem extracts the information in the D1-D12 bytes from the STM-N/STS-N signal of the downlink service, and forwards the information to the management sub-module of the multi-service subsystem;

(a6) The management sub-module of the multi-service subsystem sets the parameters of the multi-service sub-system according to the service configuration information;

( a? ) After the configuration is complete, the management sub-module sends the configuration result information to the mapping sub-module;

(a9) The management module of the cross system receives the configuration result information from the uplink .STM-N/STS-N signal, indicating that the configuration is successful.