Administration and Provisioning
Issue 8.0 July 2002
8-23
In Release 5 and later releases, add/drop cross-connections are made
between any service low-speed interface slot and the companion
low-speed interface slot (for example, slot 2A and 2B) when the slot pair is
provisioned for the OC-3 1+1 protected mode and any service STS-3
tributary. A single input enters an active and a standby add
cross-connection and two active drop cross-connections. For example,
Figure 8-6 shows service low-speed interface slot pair 8A and 8B
cross-connected to service STS-3 tributary 8 of OC-48 high-speed line 1E.
â– Through cross-connections: Through cross-connections are made
between any STS-3 tributary on OC-48 high-speed line 1E or 1W and the
same-numbered STS-3 tributary of the other OC-48 high-speed line. For
example, Figure 8-6 shows service STS-3 tributary 3 of OC-48 high-speed
line 1W cross-connected to service STS-3 tributary 3 of OC-48 high-speed
line 1E.
When an STS-3 tributary of OC-48 high-speed line 1E or 1W is cross-connected
to a service low-speed interface slot, another service low-speed interface slot may
be cross-connected to the same-numbered STS-3 tributary of the other OC-48
high-speed line. For example, Figure 8-6 shows service low-speed interface slot
2B cross-connected to service STS-3 tributary 6 of OC-48 high-speed line 1W,
and service low-speed interface slot 6B cross-connected to service STS-3
tributary 6 of OC-48 high-speed line 1E. This is consistent with the 2-fiber
bidirectional, line-switched ring standard.
NOTE:
In terms of functionality, a 1-way add plus a 1-way drop (to the same points)
perform all of the same functions as a single 2-way.
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