Regarding the allocation of two fiber bidirectional MSP ring service issues

Configuration Networking Diagram

For the two-fiber bidirectional MSP ring in a single ring network, the configuration networking diagram is relative simple. In the network construction, you should create and name NEs in sequence according to the certain direction, which helps you facilitate the planning of the service flow and service configuration.

Figure 1 shows a two-fiber bidirectional MSP ring consisting of four MSTP equipment. In this example, the PQ1 boards that are installed on the source NE (NE1) and sink NE (NE3) function as the tributary boards to add and drop services, and the SL16 boards that are installed on the source NE (NE1) and sink NE (NE3) as the line boards to transmit SDH services.

Figure 1 Networking of two-fiber bidirectional MSP ring

NOTE:

This topic considers the OptiX OSN 3500 as an example to describe the board layout. In the case of other products, the configuration method is the same, except for the slots. For the slot information, see the Hardware Description of the relevant product.

Service Signal Flow and Timeslot Allocation

When the MSP subnet is created, you can configure the two-fiber bidirectional MSP service that enters the ring network directly from the source NE, passes through the intermediate node and then is dropped on the sink NE. For the ring network service, there is more than one route from the source NE to the sink NE. In actual application scenarios, not all routes need to be configured. Thus, you should properly plan and configure the service direction and timeslots before the configuration.

Figure 1shows the service signal flow and timeslot allocation. In this example, five E1 services are configured to enter the ring network from NE1, pass through NE2, and then are dropped on the sink NE (NE3).

Figure 1 Signal flow and timeslot allocation

 

Configuration Process

The configuration of the two-fiber bidirectional MSP service is independent of creation of its MSP protection subnet. In the case that the protection subnet is created, you need to respectively configure SDH services from the tributary board to the line board on the source NE and the destination NE, and configure the pass-through service on the intermediate NE.

Prerequisites

The physical network topology must be created.

The NEs, boards, and fibers must be created on the U2000.

Lower order cross-connection resources must meet service configuration requirements. For details on how to query lower order cross-connection resources, see Querying Lower Order Cross-Connection Resources.

The created protection subnet must be consistent with the actual topology. For how to create the protection subnet, see Creating an MS Ring Protection Subnet.

Contents in Service Signal Flow and Timeslot Allocation must be mastered.

Context

CAUTION:

When the lower order resources are insufficient, do as follows:

Combine available lower order resources.

Use a cross-connect board with a higher lower order cross-connect capacity.

Configure VC-4 services.

Procedure

  1. Configure the SDH service on NE1 (source NE).
  2. Select NE1 in the NE Explorer. Choose Configuration > SDH Service Configuration from the Function Tree.
  3. Click New in the lower right portion of the window to set required parameters in the Create SDH Service dialog box that is displayed. Click OK.
Parameter Value in This Example Value Description
Level VC12 In this example, the service in the ring is the E1 service. The corresponding service level is set to VC12.
Direction Bidirectional In this example, the received and transmitted services pass through the same route, and thus the service is bidirectional. The service direction is set to Bidirectional.
Source Slot 2-PQ1 As shown in Figure 1, in the planning of this example, the PQ1 housed in slot 2 serves as the source tributary board. Different source boards can be selected according to actual situations.
Source Timeslot Range 1-5 As shown in Figure 1, in the planning of this example, the total service volume is 5xE1. The service level isVC12, and thus the 5xVC-12 need be set.
Sink Slot 8-N1SL16-1(SDH-1) As shown in Figure 1, in the planning of this example, the N1SL16 housed in slot 6 serves as the sink line board. Different sink boards can be selected according to actual situations.
Sink VC4 VC4-1 In this example, the service requires 5xVC-12. One VC-4 timeslot contains 63xVC-12. Hence, only the first VC-4 timeslot need be set.
Sink Timeslot Range 1-5 As shown in Figure 1, in the planning of this example, the total service volume is 5xE1. The service level isVC12, and thus 5xVC-12 need be set.
  1. Configure the SDH service on the sink NE (NE3). See 1 to configure the SDH service on NE3. Set the following parameters.
Parameter Value in This Example Value Description
Level VC12 In this example, the service in the ring is the E1 service. The corresponding service level is set to VC12.
Direction Bidirectional In this example, the received and transmitted services pass through the same route, and thus the service is bidirectional. The service direction is set to Bidirectional.
Source Slot 11-N1SL16-1(SDH-1) As shown in Figure 1, in the planning of this example, the SL16 housed in slot 11 serves as the source line board. Different source boards can be selected according to actual situations.
Source Timeslot Range 1-5 As shown in Figure 1, in the planning of this example, the total service volume is 5xE1. The service level is VC12, and thus 5xVC-12 need be set.
Sink Slot 2-PQ1 As shown in Figure 1, in the planning of this example, the PQ1 housed in slot 2 serves as the sink tributary board. Different sink boards can be selected according to actual situations.
Sink VC4 VC4-1 In this example, the service requires 5xVC-12. One VC-4 timeslot contains 63xVC-12. Hence, only the first VC-4 timeslot need be set.
Sink Timeslot Range 1-5 As shown in Figure 1, in the planning of this example, the total service volume is 5xE1. The service level is VC12, and thus 5xVC-12 need be set.
  1. Configure the pass-through service on NE2.
  2. Select NE2 in the NE Explorer. Choose Configuration > SDH Service Configuration from the Function Tree.
  3. Click New in the lower right portion of the window to set required parameters in the Create SDH Service dialog box that is displayed. Click OK.
Parameter Value in This Example Value Description
Level VC12 In this example, the service in the ring is the E1 service. The corresponding service level is set to VC12.
Direction Bidirectional In this example, the received and transmitted services pass through the same route, and thus the service is bidirectional. The service direction is set to Bidirectional.
Source Slot 11-N2SL16-1(SDH-1) As shown in Figure 1, in the planning of this example, the SL16 housed in slot 11 serves as the source line board. Different source boards can be selected according to actual situations.
Source VC4 VC4-1 In this example, the service requires 5xVC-12. One VC-4 timeslot contains 63xVC-12. Hence, only the first VC-4 timeslot need be set.
Source Timeslot Range 1-5 As shown in Figure 1, in the planning of this example, the total service volume is 5xE1. The service level isVC12, and thus 5xVC-12 need be set.
Sink Slot 8-N2SL16-1(SDH-1) As shown in Figure 1, in the planning of this example, the SL16 housed in slot 8 serves as the sink line board. Different sink boards can be selected according to actual situations.
Sink VC4 VC4-1 In this example, the service requires 5xVC-12. One VC-4 timeslot contains 63xVC-12. Hence, only the first VC-4 timeslot need be set.
Sink Timeslot Range 1-5 As shown in Figure 1, in the planning of this example, the total service volume is 5xE1. The service level isVC12, and thus 5xVC-12 need be set.
  1. See Verifying the Correctness of the Service Configuration to check whether the service configuration is correct.
  2. Enable the performance monitoring of the NE. For the operation steps, see Enabling, Disabling and Setting Performance Monitoring of the NE.
  3. Back up the configuration data of the NEs. For details, see Backing Up the NE Configuration Data to the SCC Board.

Relevant Task

If the services are configured incorrectly and need to be deleted, see Deleting SDH Services.

After SDH services are configured on a per-NE basis, you need to perform an SDH trail search so that you can manage configured services by using the trail management function. For details, see Searching for SDH Services.

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