
Services are added to the source NE (NE1) and then are dropped from the sink NE (NE2).
The services are transmitted on the working path.
l
Traffic direction from NE2 to NE1: NE2
→
NE1
Services are added to the source NE (NE2) and then are dropped from the sink NE (NE1).
The services are transmitted on the working path.
l
The services between NE1 and NE2 occupy VC-12s 1-5 of VC4-1 (VC4-1:VC-12:1-5) on
the SDH link between NE1 and NE2. The capacity of the services is 5xE1.
When the working path between NE1 and NE2 becomes faulty, the signal flow is as follows:
l
Traffic direction from NE1 to NE2: NE1
→
NE2
Services are added to the source NE (NE1) and then are dropped from the sink NE (NE2).
The services are transmitted on the protection path.
l
Traffic direction from NE2 to NE1: NE2
→
NE1
Services are added to the source NE (NE2) and then are dropped from the sink NE (NE1).
The services are transmitted on the protection path.
The difference between the 1:1 linear MSP service and the 1+1 linear MSP service is as follows:
l
In the case of the 1+1 linear MSP service, services are transmitted on the working path and
protection path at the same time. The sink NE selects the services from the working path.
l
In the case of the 1:1 linear MSP service, services are transmitted only on the working path.
Services are switched to the protection path for transmission only when the working path
becomes faulty.
Figure 3-8
Signal flow and timeslot allocation of the 1:1 linear MSP services
VC4-1:1-5(VC12)
VC4-1:1-5(VC12)
NE1
NE2
3-SP3D
1-SL1D-1
Traffic direction of
the working path
Line board
Tributary board
Traffic direction of
the protection path
5xE1 services are
added/dropped
1-SL1D-2
1-SL1D-1
1-SL1D-2
3-SP3D
5xE1 services are
added/dropped
3-SP3D
1-SL1D-1
3-SP3D
1-SL1D-2
1-SL1D-2
1-SL1D-1
Line board Tributary board
Tributary board Line board Line board
Line board
3.5.3 Per-NE Configuration Process
This topic describes how to configure the 1:1 linear MSP services.
Prerequisite
l
The physical topology of the network must be created.
l
The NEs, boards, and fibers must be created on the U2000.
3 Configuring SDH Services
OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
3-22
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Issue 02 (2011-06-30)