CN1323521C - A Method of Time Slot Adjustment in Virtual Concatenation Group - Google Patents

Abstract

A method for adjusting time slots in a virtual concatenation group, comprising: adding a crossover matrix (crossover capacity configured according to actual needs) on the uplink of the SDH mapping path and the downlink of the demapping path, for adjusting the virtual concatenation time slots; Replace each VC12 that can be handled by virtual concatenation with virtual branches, and configure the corresponding VC4 bus and VC12 sequence numbers of each virtual branch in the virtual concatenation group according to the time slot order required by virtual concatenation; Initialize the configuration; perform time slot configuration and time slot adjustment for the virtual concatenation group. By adopting the method of the present invention, the time division pressure of the cross board can be reduced, and the risk caused by the modification of the time slot algorithm can also be reduced.

Description

A Method of Time Slot Adjustment in Virtual Concatenation Group

technical field

The invention relates to a processing method for a virtual concatenation group time slot of a Synchronous Digital Hierarchy (SDH: Synchronous Digital Hierarchy) optical transmission device.

Background technique

In recent years, SDH-based Multi-Service Transport Platform (MSTP: Multi-Service Transport Platform) technology has been widely used in metropolitan area networks. The core idea of this technology is to use VC virtual concatenation to transmit data services. VC refers to a virtual container, which is a technical term in SDH. VC4 and VC12 represent virtual containers of different granularities. VC4 is a 140M virtual container, and VC12 is a 2M virtual container. Because different data services have different bandwidth requirements, for SDH, the service bandwidth carried by each virtual container is limited. For example, VC12 is a 2M virtual container, and VC4 counts a 140M virtual container. However, the bandwidth requirements of actual data services may be greater than the capacity of a virtual container, which requires cascading virtual containers to form a larger bandwidth container to carry data services. In principle, there are two cascading methods, that is, adjacent cascading and virtual concatenation. Since the virtual concatenation can carry out multi-path transmission, the virtual concatenation is generally used in the process of carrying data services. The configuration of the number of cascaded virtual containers through virtual cascading can flexibly meet the requirements of various data services.

In order to facilitate restoration, the time slots of the virtual concatenation are often arranged in sequence. In the previous processing method, this time slot adjustment is completed on the cross-connect board, which not only increases the time division pressure on the cross-connect board, may cause service interruption when reconfiguring time slots, but also reduces configuration flexibility.

Contents of the invention

The invention proposes a time slot adjustment method of a virtual concatenation group, which solves the time slot arrangement mode required by the virtual concatenation. According to the requirements of virtual concatenation, the adjustment of the sequence of time slots is completed, and the time slot configuration for data services by the network management is simplified. The data service can be configured according to the time slot of the electrical tributary board, and the data service can be directly supported on the original system.

There is no branch concept in the virtual concatenation, but for the convenience of description, in the present invention, each VC12 that can be processed by the virtual concatenation is regarded as a virtual branch.

Technical scheme of the present invention is:

1. A method for time slot adjustment in a virtual concatenation group, comprising:

1) Add a cross-connect matrix to the uplink of the SDH mapping path and the downlink of the de-mapping path (the cross-connect capacity is configured according to actual needs) for virtual concatenation time slot adjustment;

2) Replace each VC12 that can be processed by virtual concatenation with virtual branches, and configure the corresponding VC4 bus and VC12 sequence numbers of each virtual branch in the virtual concatenation group according to the time slot sequence required by virtual concatenation;

3) performing initialization configuration on the intersection matrix;

4) Time slot configuration and time slot adjustment are performed on the virtual concatenation group.

When the time slot configuration changes, repeat the above step 4).

In the above scheme, the method for initializing the configuration of the cross-connect matrix is: clearing the configuration of the uplink and downlink cross-connect matrix, clearing the time slots in the virtual concatenation group, and clearing the time slot configuration information of the virtual branches.

In the above scheme, the method of time slot configuration and time slot adjustment for the virtual concatenation group is: when the time slot configuration is issued, record the corresponding lower VC4 bus and VC12 sequence number of each branch according to the virtual branch number And record the corresponding VC4 bus and VC12 sequence number of each branch, cross the VC12 of the lower VC4 bus recorded by the corresponding virtual branch to the VC12 of the corresponding VC4 bus of the corresponding virtual branch; The VC12 of the VC4 bus is crossed to the VC12 of the upper VC4 bus; the time slot processing of each virtual branch is processed in a loop.

Adopt the method described in the present invention, need to revise to time slot algorithm when solving the data business on SDH equipment (data service board can be configured as common tributary circuit board, wherein the quantity of branch circuit is equal to virtual concatenation group and can handle The number of VC12), which reduces the time division pressure of the cross-connect board, and also reduces the risk caused by the modification of the time slot algorithm. At the same time, it also speeds up the software development time of data services. When the number of VC12s that can be processed by the virtual concatenation processing module increases/decreases, it is only necessary to increase/decrease the number of virtual branches, increase/decrease the capacity of the cross-connect matrix and modify The sequence numbers of the VC4 bus and VC12 corresponding to each branch in the virtual concatenation group are sufficient, and other processing methods are similar.

Description of drawings

Fig. 1 is the hardware connection diagram of time slot adjustment;

Fig. 2 is an initialization configuration diagram of time slot adjustment;

Fig. 3 is a time slot command configuration flowchart;

Fig. 4 is a hardware connection diagram of an embodiment of the present invention.

Detailed ways

Fig. 1 is a hardware connection diagram of time slot adjustment in the present invention. An N×N cross-connect matrix is added in the uplink where the data service is mapped to the SDH direction, and an N×N cross-connect matrix is added in the downlink in the demapping direction of the SDH direction.

Figure 2 and Figure 3 together constitute the time slot adjustment process of the present invention. Among them, FIG. 2 describes the initialization configuration process of time slot adjustment; FIG. 3 describes the time slot configuration process. This has been described in detail in the technical solution section, and will not be repeated here.

Fig. 4 is a hardware connection diagram of an embodiment of the present invention. The time slot adjustment of the present invention will be specifically described below with reference to FIG. 4 .

Assume that the virtual cascade processing module can handle 126 VC12s, which correspond to two VC4 buses, and each VC4 bus has 63 VC12s. When the virtual cascade is restored, the two VC4 buses are arranged in an interleaved manner. We process it as follows: data services can be mapped into 126 virtual tributary ports, where the i-th virtual tributary port corresponds to the (i%2, i/2) time slot in the processing of the virtual concatenation module (note: the first parameter represents VC4 bus number, the second represents VC12 number).

When initializing, the 126 virtual tributaries corresponding to all VC12 time slots are cleared through the uplink and downlink time slot crossover matrix.

When the time slot configuration command is issued, through the time slot mapping table corresponding to the i-th virtual branch, firstly configure the lower time slot (K, L) of the virtual branch (Note: K is the lower VC4 bus number, L is VC12 time slot number) crosses to the time slot (i%2, i/2) of virtual concatenation processing, and records the time slot simultaneously; then configures the time slot (i%2, i/2) of virtual concatenation processing to cross to Upper time slot (M, N) (note: M is the number of the upper VC4 bus, N is the number of the VC12 time slot), and record the upper time slot at the same time. Polling each tributary to complete the adjustment of the slot sequence.

When the slot configuration changes, it is only necessary to reconfigure the uplink and downlink cross-connect matrix, and the corresponding relationship between the virtual tributary and the virtual concatenation processing time slot does not change.

Claims (2)

1. A method for time slot adjustment in a virtual concatenation group, comprising: 1) Add a crossover matrix to the uplink of the SDH mapping path and the downlink of the demapping path, respectively, for adjusting the virtual concatenation time slot; 2) Replace each VC12 that can be processed by virtual concatenation with virtual branches, and configure the corresponding VC4 bus and VC12 sequence numbers of each virtual branch in the virtual concatenation group according to the time slot sequence required by virtual concatenation; 3) performing initialization configuration on the intersection matrix; 4) Perform time slot configuration and time slot adjustment for the virtual concatenation group, the specific method is: When the time slot configuration is issued, record the corresponding VC4 bus and VC12 sequence number of each branch according to the virtual branch number and record the VC4 bus and VC12 sequence number corresponding to each branch, and record the corresponding virtual branch The VC12 of the lower VC4 bus is crossed to the VC12 of the VC4 bus corresponding to the corresponding virtual branch; and the VC12 of the corresponding VC4 bus of the corresponding virtual branch is also crossed to the VC12 of the upper VC4 bus; the time slot of each virtual branch is processed in a loop deal with. 2. The method for adjusting time slots in a virtual concatenation group according to claim 1, wherein the method for initializing and configuring the cross-connect matrix is: clearing the configuration of the uplink and downlink cross-connect matrix, and the time slots in the virtual concatenation group The time slot configuration information of the virtual tributary is also cleared.