Configuring 1+1 Linear MSP Services
Networking Diagram
The networking diagram of the point-to-point 1+1 linear MSP services is simple. Two NEs are connected with two pairs of optical fibers.
As shown in Figure 1, the PQ1 boards are used on NE1 and NE2 as tributary boards to add and drop services, and the SL16 boards are used as line boards to transmit SDH services.
Figure 1 Networking diagram of the 1+1 linear MSP
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.
Signal Flow and Timeslot Allocation
To configure the 1+1 linear MSP service, you can configure the service added to the source NE and dropped from the sink NE if the 1+1 linear MSP is already created.
As shown in Figure 1, the signal flow and timeslot allocation are as follows:
Traffic direction from NE1 to NE2: NE1→NE2
Services are added to the source NE (NE1) and are transmitted from the working path and protection path at the same time. Then, the services are dropped from the sink NE (NE2), which selects the services from the working path.
Traffic direction from NE2 to NE1: NE2→NE1
Services are added to the source NE (NE2) and are transmitted on the working path and protection path at the same time. Then, the services are dropped from the sink NE (NE1), which selects the services from the working path.
The services between NE 1 and NE2 occupy VC-12s 1-5 of VC-4-1 (VC-4-1: VC-12: 1-5) on the SDH link between NE1 and NE2. The capacity of the services is 5xE1.
When the working path from NE1 to NE2 becomes faulty, in the case of single-ended switching, the signal flow is as follows:
Traffic direction from NE1 to NE2: NE1→NE2
Services are added to the source NE (NE1) and are transmitted on the working path and protection path at the same time. Then, the services are dropped from the sink NE (NE2), which selects the services from the protection path.
The services from NE2 to NE1 are not affected, and the traffic direction is NE2→NE1.
Services are added to the source NE (NE2) and are transmitted on the working path and protection path at the same time. Then, the services are dropped from the sink NE (NE1), which selects the services from the working path.
When the working path from NE1 to NE2 becomes faulty, in the case of dual-ended switching, the traffic flow is as follows:
Traffic direction from NE1 to NE2: NE1→NE2
Services are added to the source NE (NE1) and are transmitted on the working path and protection path at the same time. Then, the services are dropped from the sink NE (NE2), which selects the services from the protection path.
Traffic direction from NE2 to NE1: NE2→NE1
Services are added from the source NE (NE2) and are transmitted on the working path and protection path at the same time. Then, the services are dropped from the sink NE (NE1), which selects the services from the protection path.
Figure 1 Signal flow and timeslot allocation of the 1+1 linear MSP service
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