CN104796289A - Electric power SDH data service protection configuration method and data service transmission method - Google Patents

Abstract

The invention discloses a power SDH data service protection configuration method and a data service transmission method, comprising the following steps: according to the bandwidth requirement of a certain data service, determining the number of virtual circuits that need to be configured for the data service, assuming that the number is 2N; according to the The start and end sites of the data service determine the paths of the service in two different directions in the transmission network ring network, which are the first path and the second path respectively; according to the first path, configure the number of virtual circuits with a number of N for the data service The first service channel; according to the second path, configure a number of N virtual circuits for the data service to form the second service channel; at the start and end sites of the data service, perform virtual concatenation configuration on all virtual circuits to obtain virtual concatenation Group; set the LCAS function for the virtual concatenation group. The beneficial effects of the present invention: under the same resource utilization rate as that of the SNCP-based protection configuration method, the bandwidth of data services can be increased, thereby providing more possibilities for service upgrades.

Description

A power SDH data service protection configuration method and data service transmission method

technical field

The invention relates to a power SDH data service protection configuration method and a data service transmission method.

Background technique

At present, in electric power communication, because the SDH transmission network carries services such as relay protection, even if it has a ring network structure, ring network protection methods such as multiplex section protection rings and channel protection rings are generally not used.

Since the power transmission network is often disconnected with the transformation of the power grid, the services carried should also have the conditions to provide protection when needed. For services that provide protection for the needs of substations and central stations at the start and end ends, SNCP (Sub-Network Connection Protection) protection methods are usually used to provide services from substations from two different directions of the ring network to the central station. Two mutually backup transmission channels (main channel and protection channel) with completely different paths.

This SNCP-based service protection configuration method can provide reliable independent protection for each service, but this method needs to occupy double transmission resources, and the resource utilization rate is low.

For some data services (such as video surveillance) whose starting and ending ends are substations and central stations, the requirements for bandwidth are flexible, that is, there is an optimal bandwidth configuration and the lowest bandwidth limitation. The best effect can be obtained in the case of the optimal bandwidth, the basic requirements of the business can be guaranteed in the case of the lowest bandwidth, and the service recovery time requirement in the case of a service channel failure is not very strict (usually at the level of seconds or several seconds).

For this type of data service, the resource utilization rate will be low due to the SNCP-based service protection configuration method.

Contents of the invention

The present invention provides a power SDH data service protection configuration method and data service transmission method, which utilizes virtual concatenation and LCAS (Link Capacity Adjustment Scheme) technology to solve the problem of low resource utilization based on the SNCP service protection configuration method , while ensuring service availability.

In order to achieve the above object, the present invention adopts the following technical solutions:

A method for configuring power SDH data service protection, comprising the steps of:

Step (1): For a data service with elastic bandwidth requirements, determine the number of virtual circuits that need to be configured for the data service according to its bandwidth requirements, assuming that the number is 2N;

Step (2): According to the starting and terminating sites of the data service, determine the paths of the business in two different directions in the transmission network ring network, which are respectively the first path and the second path;

Step (3): According to the first path determined in step (2), configure a number of N virtual circuits for the data service to form the first service channel;

Step (4): according to the second path determined in step (2), configure a number of N virtual circuits for the data service to form a second service channel;

Step (5): at the start and end sites of the data service, perform virtual concatenation configuration on all virtual circuits to obtain a virtual concatenation group;

Step (6): Set the LCAS function for the virtual concatenation group.

The data service with elastic bandwidth requirements has the optimal bandwidth configuration and the lowest bandwidth limitation.

The data service with elastic bandwidth requirements can ensure fast data transmission speed, low delay, and high reliability and real-time performance under optimal bandwidth conditions.

The data service with elastic bandwidth requirements can guarantee the most basic data transmission under the condition of the lowest bandwidth.

The data service with elastic bandwidth requirements has relatively loose requirements on fault recovery time, which may be at the level of seconds or several seconds.

A power SDH data service transmission method, comprising the following conditions:

Under normal circumstances, the data service transmits data through all the virtual circuits of the two service channels of the virtual concatenation group, that is, the sending end distributes the original service data to all the virtual circuits for transmission, and reaches the receiving end through the two service channels. The terminal caches the data from different virtual circuits and then arranges and reorganizes them to restore the original business data;

When some virtual circuits fail, because the LCAS function is set for the virtual concatenation group, the SDH network management system will automatically identify the fault and remove the unavailable virtual circuits from the virtual concatenation group. At this time, the service bandwidth is equal to the remaining The sum of the bandwidth of the virtual circuit.

After the failure of the faulty virtual circuit is eliminated, the SDH network management system will automatically identify and add the recovered virtual circuit to the virtual concatenation group, and the service bandwidth will be restored at this time.

Virtual concatenation is to concatenate virtual containers distributed in different STM-N data frames (which can be on the same path or different paths) into VC-4/3/12-Xv format, and transmit them as a virtual overall structure.

LCAS is a dynamic bandwidth adjustment protocol based on virtual concatenation proposed by ITU-T. This protocol automatically removes and adds members according to the status of members of the virtual concatenation group, thereby adjusting the link capacity of the virtual concatenation service without damage and realizing Dynamic adjustment of service bandwidth.

The beneficial effects of the present invention are:

1. On the premise of ensuring the use of data services, the utilization rate of transmission resources is greatly improved;

2. Under the same resource utilization rate as the SNCP-based protection configuration method, the bandwidth of data services can be increased, thus providing more possibilities for service upgrades;

3. Virtual cascading is more flexible than adjacent cascading. In addition, unlike adjacent cascading, virtual cascading only requires the terminal equipment to support the virtual cascading function, and there is no requirement for the equipment passing through the service.

Description of drawings

Fig. 1 is a schematic diagram of a configuration method based on SNCP protection;

Fig. 2 is a schematic diagram of the protection configuration method proposed by the present invention;

Fig. 3 is a flow chart of the protection configuration method proposed by the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Suppose the optimal bandwidth of the data service is Ba, and the lowest bandwidth is Bb.

As shown in Figure 1, under the SNCP-based protection configuration method, the bandwidth of the main channel and the protection channel is B1, and the data service bandwidth is also B1. In order to ensure the best effect of the data service, generally B1=Ba, at this time, the transmission resource occupied in the whole network is 2×B1=2Ba.

As shown in Fig. 2, under the protection configuration method proposed by the present invention, the bandwidths of service channel 1 and service channel 2 are both B2, and the data service bandwidth is 2×B2. In order to ensure the best effect of the data service, and at the same time ensure that the minimum bandwidth requirement of the data service is met when the service channel is blocked due to a fault in a certain direction, then B2≥Bb and 2×B2≥Ba, that is, B2=MAX(Bb , Ba/2).

At this time, the transmission resources occupied in the entire network are 2*B2=2MAX(Bb, Ba/2)=MAX(2Bb, Ba). Since Bb≤Ba, 2*B2≤2Ba.

That is to say, under the premise of ensuring the use of data services, the protection configuration method proposed by the present invention occupies less transmission resources.

In special cases, if Bb=Ba, then under the protection configuration method proposed by the present invention, the occupied transmission resources 2×B2=2Bb=2Ba=2×B1, that is to say, occupy the same resource as that based on the SNCP protection configuration method. transmission resources, but at this time the data service bandwidth is normally 2×B2=2×B1. That is to say, the protection configuration method proposed by the present invention can improve the bandwidth of the data service under the same resource utilization rate as that of the SNCP-based protection configuration method.

As shown in Figure 3, a kind of power SDH data service protection configuration method comprises the following steps:

Step (1): For a data service with elastic bandwidth requirements, calculate the number of virtual circuits that need to be configured for the data service according to its bandwidth requirements. Assume that the number is 2N, and the total bandwidth of virtual circuits with the number N should be greater than or equal to The minimum bandwidth for data services, the total bandwidth of 2N virtual circuits is greater than or equal to the optimal bandwidth;

Step (2): According to the starting and terminating sites of the data service, determine the paths of the business in two different directions in the transmission network ring network, which are respectively the first path and the second path;

Step (3): According to the first path determined in step (2), configure a number of N virtual circuits for the data service to form the first service channel;

Step (4): according to the second path determined in step (2), configure a number of N virtual circuits for the data service to form a second service channel;

Step (5): at the start and end sites of the data service, perform virtual concatenation configuration on all virtual circuits to obtain a virtual concatenation group;

Step (6): Set the LCAS function for the virtual concatenation group.

Under normal circumstances, the data service transmits data through all virtual circuits in the virtual concatenation group, that is, the sending end distributes the original service data to all virtual circuits for transmission, and then reaches the receiving end through two service channels in different directions, and the receiving end will The data from different virtual circuits is cached and reorganized to restore the original business data. At this time, the data service bandwidth is equal to the bandwidth of the two service channels.

When the transmission optical path is interrupted due to the disconnection of the optical cable in a certain direction of the transmission network, the service channel of the data service in this direction is interrupted, which will cause the included virtual circuit to fail. Since the LCAS function is set for the virtual concatenation group, the system automatically identifies the fault and removes the unavailable virtual circuit from the virtual concatenation group. At this time, only another service channel is available, and the service bandwidth is reduced to half of the original, but it can still meet the requirements. Basic transmission of data services.

After the optical cable is repaired and the optical path is interrupted and restored, the failure of the faulty virtual circuit is eliminated, and the system automatically recognizes and re-adds the restored virtual circuit to the virtual concatenation group. Back to normal.

Virtual concatenation is to concatenate virtual containers distributed in different STM-N data frames (which can be on the same path or different paths) into VC-4/3/12-Xv format, and transmit them as a virtual overall structure.

LCAS is a dynamic bandwidth adjustment protocol based on virtual concatenation proposed by ITU-T. This protocol automatically removes and adds members according to the status of members of the virtual concatenation group, thereby adjusting the link capacity of the virtual concatenation service without damage and realizing Dynamic adjustment of service bandwidth.

In the SDH/MSTP system, in order to flexibly set up the network and improve the utilization rate of the bandwidth, the way of virtual concatenation is usually used to encapsulate and map the data. The principle of the cascading technology is to combine multiple virtual containers and use them as a single container that maintains the integrity of the bit sequence to realize the transmission of large-grained services. Cascading is divided into adjacent cascading and virtual cascading. Adjacent concatenation is to concatenate adjacent virtual containers in the same STM-N data frame into VC-4/3/12-Xc format and transmit as a whole structure.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (8)

1. an electric power SDH data service protection collocation method, is characterized in that, comprise the steps:

Step (1): to a certain data service with elasticity bandwidth requirement, according to its bandwidth demand, determines that this data service needs the virtual circuit quantity of configuration, supposes that quantity is 2N;

Step (2): the initial sum according to this data service stops website, determines the path of business two different directions in transmission network looped network, is respectively the first path and the second path;

Step (3): the first path determined according to step (2), the virtual circuit being N for data service configuration quantity forms the first service channel;

Step (4): the second path determined according to step (2), the virtual circuit being N for data service configuration quantity forms the second service channel;

Step (5): stop website in the initial sum of data service, Virtual Concatenation configuration is carried out to whole virtual circuit, obtains virtual cascade group;

Step (6): for virtual cascade group arranges LCAS function.

2. a kind of electric power SDH data service protection collocation method as claimed in claim 1, is characterized in that, described in there is the data service of elasticity bandwidth requirement, there is optimum band width configuration, there is minimum bandwidth restriction simultaneously.

3. a kind of electric power SDH data service protection collocation method as claimed in claim 1; it is characterized in that; the described data service with elasticity bandwidth requirement can ensure that under the bandwidth situation of optimum data transmission bauds is fast, time delay is low, has high reliability and real-time.

4. a kind of electric power SDH data service protection collocation method as claimed in claim 1, is characterized in that, described in there is elasticity bandwidth requirement data service can ensure the most basic transfer of data under minimum bandwidth situation.

5. a kind of electric power SDH data service protection collocation method as claimed in claim 1, is characterized in that, described in there is elasticity bandwidth requirement data service loosely require to failure recovery time, be rank or several seconds rank second.

6. an electric power SDH data business transmission method, is characterized in that, comprises following situation:

Under normal circumstances, data service is by all virtual circuit transmission data of two service channels of virtual cascade group, namely original service data allocations transmits by transmitting terminal to all virtual circuits, receiving terminal is arrived by two service channels, carry out arrangement restructuring after the data buffer storage that different virtual circuit is come by receiving terminal, recover original service data;

When some virtual circuit breaks down, because virtual cascade group is provided with LCAS function, SDH network management system automatically identifies fault and is removed from virtual cascade group by disabled virtual circuit, and now service bandwidth equals the bandwidth sum remaining virtual circuit in virtual cascade group;

After the Failure elimination of fault virtual circuit, SDH network management system automatically identifies and is again added in virtual cascade group by normal for recovery virtual circuit, and now service bandwidth is restored.

7. a kind of electric power SDH data business transmission method as claimed in claim 6, is characterized in that, Virtual Concatenation is that the virtual container be distributed in different STM-N Frame is cascaded into VC-4/3/12-Xv form, transmits as a virtual overall structure.

8. a kind of electric power SDH data business transmission method as claimed in claim 6, it is characterized in that, LCAS is a kind of adjustment of the dynamic bandwidth based on Virtual Concatenation agreement that ITU-T proposes, this agreement is removed automatically according to virtual cascading member state and is added member, thus the link capacity of undamaged adjustment Virtual Concatenation business, realize the dynamic conditioning of service bandwidth.