Lucent DDM-2000 OC-3 User And Service Manual page 143

NTP-011
: Circuit Order
Page 3 of 6
DO ITEMS BELOW IN ORDER LISTED. . . . . FOR DETAILS, GO TO
6.
NOTE:
DS1 LOW SPEED slots cannot be unequipped without an
alarm until all port cross-connections are removed. The
cross-connections must be removed first before removing
circuit packs. In a ring configuration, remove the
cross-connections from the terminating nodes first, then
remove the pass-through cross-connections at the
intermediate nodes. A Major alarm may occur when the first
cross-connection at the terminating node is deleted and
clear when the other terminating cross-connection is
deleted.
NOTE:
In ring configurations, the following rules are used 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-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 provisioned as STS-1 cross-connections.
DDM-2000 OC-3 M
Issue 2, February 2000
ULTIPLEXER
363-206-285