363-206-295
Applications
Issue 1 December 1997 2-9
VT1.5 bandwidth rearrangement is available which allows the unused VT1.5s
from an STS-1 dropped at one site to be dropped at other sites. All DDM-2000
OC-3 and OC-12 Multiplexer shelves connected together in this subnetwork can
communicate, using the single-ended operations capability of DDM-2000
Multiplexers. Once the DDM-2000 Multiplexer OC-12 ring is in place, it can be
used by itself to provide STS-1 level path switching with DDM-2000 OC-3
Multiplexers to provide VT1.5 level path switching, or in a mixed configuration
where both STS-1 level and VT1.5 level switching are supported simultaneously.
The link between the DDM-2000 OC-12 and OC-3 Multiplexers is 0x1 protected
for this ring configuration. In this case, the DDM-2000 OC-12 Multiplexer feeds
STS-1s directly off of each ring rotation to the DDM-2000 OC-3 Multiplexer where
path switching is done. Switching is not done on the DDM-2000 OC-12
Multiplexer; rather VT1.5 or STS-1 level switching is done on the DDM-2000 OC-3
Multiplexer. Interconnecting the DDM-2000 OC-12 and OC-3 Multiplexers via a
0x1 interface allows the same STS-1 to be dropped to DDM-2000 OC-3 shelves at
several nodes on the OC-12 ring. This combination of interconnected DDM-2000
OC-12 and OC-3 Multiplexers provides full VT1.5 switching granularity across the
entire OC-12 bandwidth at any node on the ring, resulting in a full-fledged VT1.5
path switched OC-12 ring.
The DDM-2000 OC-12 path switched ring can be used in conjunction with the
DDM-2000 OC-3 Multiplexer by an access provider to provide OC-3 ring service
on an OC-12 ring for end users. It is becoming more frequent that a single end
user desires a virtual private network from an access provider to connect several
sites in a metropolitan area together. It is accomplished by deploying a DDM-2000
OC-12 ring in conjunction with DDM-2000 OC-3 Multiplexers. As described
previously, the DDM-2000 OC-3 Multiplexers provide VT1.5 and STS-1 path
switching; however, in this case, they are placed at end-user locations. The
DDM-2000 OC-3 equipment is then used exclusively by that end user and three
STS-1s worth of bandwidth are reserved on the OC-12 ring for that end user.
The end user is given log-on privileges to the OC-3 equipment located on their
premises, allowing them to gather performance data, provision service, and
administer their virtual OC-3 ring network. From the end user's point of view, they
have a virtual OC-3 ring network at their disposal.
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