Nortel Networks OPTera Metro 3500 - Manual (Page 219)

Operation, administration, and maintenance (OAM) features 2-181
Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
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 ).