Nortel Networks 3500, NTRN10AN manual VT grooming on a Upsr

Operation, administration, and maintenance (OAM) features 2-181

VT grooming on a UPSR

You can use OPTera Metro 3000 NEs equipped with VTX circuit packs at an OPTera Metro 3500 STS-managed site to groom VTs. VT grooming can optimize bandwidth on the OPTera Metro 3500 STS-managed backbone network. When you use OPTera Metro 3500 STS-managed NEs with OPTera Metro 3000 NEs that support virtual tributaries (VT), consider VT management when planning traffic flow and the path originating and terminating points.

Note: An OPTera Metro 3500 shelf equipped with STX-192 circuit packs does not support VT management.

Two methods for grooming VTs are:

•Use dedicated STS at each node and provision STS connections at each passthrough OPTera Metro 3000 node on the subtending UPSR. In this option, each remote site has dedicated STS. An OPTera Metro 3000 NE connected to an OPTera Metro 3500 STS-managed NE in a linear 1+1 configuration grooms VT traffic before sending the traffic to the OPTera Metro 3500 STS-managed backbone network or to other tributary ports. The grooming of VTs optimizes bandwidth on the OPTera Metro 3500 STS-managed backbone network (see Figure 2-68 on page 2-182).

•Use shared VT-managed STS. In this option, remote OPTera Metro 3000 sites form a virtual UPSR with an OPTera Metro 3000 NE at an OPTera Metro 3500 STS-managed site. The UPSR virtual ring passes through the OPTera Metro 3500 STS-managed site. The OPTera Metro 3000 NE at the OPTera Metro 3500 STS-managed site grooms VT traffic before sending the traffic to the OPTera Metro 3500 STS-managed backbone network or to other tributary ports. Again, the grooming of VTs optimizes bandwidth on the OPTera Metro 3500 STS-managed backbone network (see Figure 2-69 on page 2-183).

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004