Fig. 1 Linear 1+1 protection grouping diagram for multiplexed segments
Service signal flow and time slot allocation
As shown in Fig. 1, the service signal flow and time slot allocation are:

• The service flow from NE1 to NE2 is: NE1→NE2. service from the source network element NE1, the service signal is transmitted on the working line and the protection line at the same time; the service is placed on the host network element NE2, and the host network element NE2 selects and receives the service signal on the working line.

• The service flow from NE2 to NE1 is: NE2→NE1. from the source network element NE2, the service signal is transmitted on the working line and the protection line at the same time; in the host network element NE1, the service is placed under the host network element NE1, which selects and receives the service signal on the working line.

• The service of NE1←→NE2 occupies time slots 1 to 5 of VC-12 (VC4-1:VC12:1-5) of VC-4 No. 1 on the SDH link between NE1 and NE2, and the service size is five E1 services.

When the working line of NE1→NE2 fails, the service signal flow during single-ended inversion is:

• NE1→NE2. the service flow from NE1 to NE2 is: NE1→NE2. from the source network element NE1 on the service, the service signal is transmitted on the working line and the protection line at the same time; on the host network element NE2 under the service, the host network element NE2 selects and receives the service signal on the protection line.

• The service from NE2 to NE1 is not affected, and the service flow direction is: NE2→NE1. from the source network element NE2, the service signal is transmitted on the working line and the protection line at the same time; in the host network element NE1, the service is placed under the host network element NE1, and the host network element NE1 selects and receives the service signal on the working line.

When the working line of NE1→NE2 is faulty, the service signal flow when the double-end is reversed is:

• NE1→NE2. the service flow from NE1 to NE2 is: NE1→NE2. service from the source network element NE1, the service signal is transmitted on the working line and the protection line at the same time; service under the host network element NE2, the host network element NE2 selects and receives the service signal on the protection line.

• The service flow from NE2 to NE1 is: NE2→NE1. from the source network element NE2, the service signal is transmitted on the working line and the protection line at the same time; in the host network element NE1, the service is transmitted under the host network element NE1, and the host network element NE1 selects and receives the service signal on the protection line.

Figure 1 Multiplexing Segment Linear 1+1 Protection Service Signal Flow and Time Slot Allocation

Configuration Procedure
Prerequisites

• The physical topology of the network is built.

• The network elements, veneers, and fibers have been created successfully on the network management.

• The protection subnet has been created and is consistent with the actual topology. See Creating a Linear Multiplexing Segment Protection Subnet for the creation method.

• Understand the Service Signal Flow and Time Slot Allocation sections.

Optix metro1000 Configuring Multiplexed Segment Linear 1+1 Protection Services Procedure

1. Configure the SDH service of the source network element in NE1.

1. Select network element NE1 in the network element manager, and then select "Configuration > SDH Service Configuration" in the function tree.

1. Click "New" at the bottom of the right window to bring up the "New SDH Service" dialog box, complete the parameter settings and click "OK".

Parameter	Value in this example	Description
Grade	VC12	The service in this example is an E1 service, so set the corresponding service "level" to "VC12".
Direction	Bidirectional	In this example, the incoming and outgoing services are routed through the same route, so they are bi-directional services. Select "Bidirectional" when setting the service "Direction".
Source board position	6-SP2D	As shown in Figure 1, in this example, SP2D is planned to be used in slot 6 as the source tributary board for bidirectional services from NE1 to NE2.
Source time slot range (e.g., 1, 3-6)	1-5	According to the plan, the total service size is 5 E1 services, and the "Source time slot range (e.g., 1, 3-6)" is set to "1-5".
Host board position	3-OI2D-1(SDH-1)	As shown in Figure 1, in this example, we plan to use OI2D as the host board in slot 3.
Host VC4	VC4-1	In this example, the service requires VC12s in the range of 5 time slots, and one VC4 time slot can accommodate 63 VC12s, so the "Host VC4" is set to "VC4-1".
Host time slot range (e.g. 1, 3-6)	1-5	According to the planning, the total service size is 5 E1 services. Here, the "Host time slot range (e.g., 1, 3-6)" is set to "1-5".

1. Configure the SDH service of the host network element in NE2.

Parameter items	Value in this example	Description
Grade	VC12	The service in this example is an E1 service, so set the corresponding service "level" to "VC12".
Direction	Bidirectional	In this example, the incoming and outgoing services are routed through the same route, which is a bi-directional service. Select "Bidirectional" when setting the service "Direction".
Source board position	3-OI2D-1(SDH-1)	As shown in Figure 1, we plan to use OI2D as the source board in slot 3 in this example.
Source VC4	VC4-1	In this example, the service requires VC12s in the range of 5 time slots, and one VC4 time slot can accommodate 63 VC12s, so the "Source VC4" is set to "VC4-1".
Source time slot range (e.g. 1, 3-6)	1-5	According to the planning, the total service size is 5 E1 services, and here the "Source time slot range (e.g., 1, 3-6)" is set to "1-5".
Host board position	6-SP2D	As shown in Figure 1, in this example, SP2D is planned to be used in slot 6 as the host tributary board for NE1 to NE2 bidirectional services.
Host time slot range (e.g., 1, 3-6)	1-5	According to the plan, the total service size is 5 E1 services, and the "Host time slot range (e.g., 1, 3-6)" is set to "1-5".

1. Refer to Verifying the Correctness of SDH Service Configuration to verify the correctness of the service configuration.

1. Enable the performance monitoring of the network element; refer to Setting the Performance Monitoring Parameters of the Network Element for the procedure.

1. Backup the configuration data of the network element.

Related Tasks