Administration and Provisioning
Issue 8.0 July 2002
8-37
the slot pair may be specified when entering the cross-connection.) A
single input enters an active and a standby add cross-connection and two
active drop cross-connections.
■ Through cross-connections: Through cross-connections are made
between any STS-1 tributary on OC-48 high-speed line 1E or 1W and the
same-numbered STS-1 tributary of the other OC-48 high-speed line. For
example, Figure 8-13 shows service STS-1 tributary 1 of STS-3 tributary
(3-1) on OC-48 high-speed line 1W cross-connected to service STS-1
tributary 1 of STS-3 tributary 3 (3-1) on OC-48 high-speed line 1E.
When an STS-1 tributary of OC-48 high-speed line 1E or 1W is cross-connected
to a service low-speed port, another service low-speed port may be
cross-connected to the same-numbered STS-1 tributary of the other OC-48
high-speed line. For example, Figure 8-13 shows service low-speed port 2 of slot
2B (2B-2) cross-connected to service STS-1 tributary 2 of STS-3 tributary 6 (6-2)
on OC-48 high-speed line 1W, and service low-speed port 1 of slot 6B (6B-1)
cross-connected to service STS-1 tributary 2 of STS-3 tributary 6 (6-2) on OC-48
high-speed line 1E. This is consistent with the 2-fiber bidirectional, line-switched
ring standard.
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