363-206-285 Detailed Level Procedure: DLP-560
Issue 2, February 2000 Page 9 of 18
DDM-2000 OC-3 MULTIPLEXER
7.
NOTE:
Cross-connections supporting DS1 services may be either STS1 or
VT1.5 cross-connections in DDM-2000 OC-3. Only STS-1
cross-connections are allowed in DDM-2000 OC-12. In an OC-3 shelf,
use VT1.5 cross-connections for DS1 services if you expect to
cross-connect only a portion of the VT1.5 signals in the STS-1 channel.
If STS1 cross-connections are made at an OC-3 shelf, there is a fixed
mapping of all 28 VT1.5 cross-connections to a specific shelf group [see
ent-crs-sts1: command].
NOTE:
The following commands may be used to delete, enter, and retrieve
cross-connections: dlt-crs-vt1 (OC-3 only), dlt-crs-sts1,
ent-crs-vt1 (OC-3 only), ent-crs-sts1, rtrv-crs-vt1 (OC-3
only), and rtrv-crs-sts1. See the Commands and Reports section of
each system manual for a description of commands.
NOTE:
In ring configurations, you should use the following rules in establishing
cross-connections in each ring:
1. All terminating drop connections (including DRI, if present) from the
same STS-1 timeslot must be provisioned the same, either all
VT1.5 or STS-1.
2. If all 28 VT1.5s (DS1s) in an STS-1 are being passed through at a
node in a VT1.5 path-switched ring, then the cross-connection may
be provisioned as either a pass-through STS-1 or VT1.5. However,
if you anticipate dropping VT1.5s from the pass-through node in
the future, you should provision the pass-throughs as VT1.5
cross-connections. Provisioning now as a VT1.5 cross-connect will
avoid a hit on traffic if the STS-1 cross-connect has to be converted
to 28 VT1.5 cross-connects to drop DS1s at a later time.
3. On STS-1 path-switched rings, all nodes in the ring must be provi-
sioned as STS-1 cross-connections.
From work order or circuit order, determine the cross-connections [STS-1 or
VT1.5] to be made at each node [pass-through, terminating (drop), and host
OC-12 node(s)] associated with the kind of service being established.
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