Nortel Networks OPTera Metro 3500 - Manual (Page 224)

2-186 Operation, administration, and maintenance (OAM) features
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Collocated OPTera Metro 3000 NE and shared VT-managed STS
A connection that uses a collocated OPTera Metro 3000 NE and shared
VT-managed STS has the advantage of not requiring dedicated STS at each
site, resulting in more efficient use of bandwidth at the edge. See
Figure 2-71
on page 2-187 .
With this type of connection, you can use multiple virtual rings at the edge with
each virtual ring covering a different physical route and having different
termination points. Each virtual ring can operate at STS-1 or higher
bandwidth. See
Figure 2-72 on page 2-188 .
As with the option described in the previous section, this connection is a
modular network design with low initial costs and allows efficient bandwidth
utilization of the OPTera Metro 3500 STS-managed backbone network.