363-206-285
Administration and Provisioning
Issue 3 June 2001
8-59
OC-3/OC-1 Ring Cross-Connection Provisioning 8
For every DS1 transported through a ring network, a cross-connection is needed
in every NE (node) on the ring. A "drop" cross-connection is needed at the nodes
where service enters or exits the ring. A "pass-through" cross-connection is
needed at all other nodes (intermediate nodes) on the ring.
For the DDM-2000 Multiplexers, cross-connections of both ring paths are entered
with a single command entry per shelf. This minimizes the possibility of
provisioning a circuit without a protection channel. A DDM-2000 OC-1 ring has 28
VT1.5 channels. The ring channels are always carried within the 26-type OLIU
circuit packs in the main 1 and main 2 slots in FiberReach WBS nodes. There is
no need to identify ring channels in main 1 different from main 2 because both
rings are always provisioned with the same information.
At the entry and exit points, the VT channels are cross-connected to the low-
speed ports (for example, {ls group}-{slot#}-{port# on slot},
a-1-4). These are called "drop" connections. For example, the command
ent-crs-vt1:m-1-6-4,a-1-3 connects the third low-speed port associated
with slot 1 of low-speed group A to the fourth VT1.5 within the sixth VT group
within the first (and only) STS-1 of both OC-1 rings.
At the intermediate nodes, a pass-through cross-connection establishes a cross-
connect path on both rings. Pass-through cross-connections are designated by
using the same VT ring channel twice in the cross-connect address. For example,
the single command ent-crs-vt1:m-1-6-4:m-1-6-4 connects a pass-
through cross-connection both to and from the fourth VT1.5 within the sixth VT
group within the first STS-1 of both the service and protection ring.
Depending on local practice, work orders will normally identify the low-speed port
designations at the entry and exit points in the network and the TIDs of the NEs at
these points. The work order may also designate the VT1.5 ring channel which
will be used for this service. If the work order does not designate a ring channel to
use, use the command rtrv-crs-vt1; to identify all the ring channels that are
currently unassigned. The work order also may not designate all the other NEs on
the ring that need to be provisioned with pass-through cross-connections. In this
case, use the rtrv-map-netwk command to identify the TIDs for all the NEs in a
ring.
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