363-206-285 Detailed Level Procedure: DLP-550
Issue 2, February 2000 Page 5 of 12
DDM-2000 OC-3 MULTIPLEXER
4.
NOTE:
In dual ring configurations, cross-connections consist of "drop and
continue" connections in addition to pass-through and terminating
cross-connections. For example in Figures 5 through 8, drop and
continue connections are made at the four nodes in CO 1 and CO 2
located between the two rings. Also, cross-connections must be made in
all interconnected rings, including other DDM-2000 OC-3 rings,
DDM-2000 OC-12 rings, and FT-2000 OC-48 rings, as required.
NOTE:
In ring configurations, you should use the following rules in establishing
cross-connections in each ring:
1. All 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. Also, provisioning now as a VT1.5 cross-con-
nect will avoid a hit on traffic if the STS-1 cross-connect has to be
converted (cnvt-crs) 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, circuit order, and the sketch made in Step 1, determine the
pass-through nodes for the service being established.
5. Use the rtrv-eqpt: command at each node to verify that each shelf is
properly equipped for the service being established. For example, is the group
or slot being used for service at the terminating ends equipped with the proper
MXRVO and/or DS1/DS1PM circuit packs if DS1 service is being established?
6.
NOTE:
Cross-connections supporting DS3 services are STS1
cross-connections. Cross-connections supporting DS1 services may be
either STS1 or VT1.5 cross-connections. 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 a shelf, there is a fixed mapping of all 28 VT1.5
cross-connections to a specific shelf group (see ent-crs-sts1
command).
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