Administration and Provisioning
8-16 Issue 8.0 July 2002
the "A" slot and another active drop cross-connection from the same
incoming STS-3 tributary to the "B" slot. For example, Figure 8-2 shows
incoming service STS-3 tributary 4 of OC-48 high-speed line 1E
cross-connected to service low-speed interface slots 6A and 6B.
■ Through cross-connections: Through cross-connections are made from
any incoming STS-3 tributary of OC-48 high-speed line 1E or 1W to the
same-numbered outgoing STS-3 tributary of the other OC-48 high-speed
line. For example, Figure 8-1 shows incoming service STS-3 tributary 3 of
OC-48 high-speed line 1W cross-connected to outgoing 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 8-1 shows service low-speed interface slot
2B cross-connected to service STS-3 tributary 6 of OC-48 high-speed line 1W,
and service STS-3 tributary 6 of OC-48 high-speed line 1E cross-connected to
service low-speed interface slot 6B. 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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