Administration and Provisioning
Issue 8.0 July 2002
8-31
■ Drop cross-connections: Drop cross-connections are made from any
incoming STS-1 tributary of OC-48 high-speed line 1E or 1W to any service
low-speed port. For example, Figure 8-8 shows incoming service STS-1
tributary 2 of STS-3 tributary 5 (5-2) on OC-48 high-speed line 1W
cross-connected to service low-speed port 1 of slot 4B (4B-1).
Drop cross-connections are also made to any service low-speed interface
slot and the companion low-speed interface slot (for example, 2A and 2B)
when the slot pair is provisioned for the OC-3 1+1 protected mode. (Any
low-speed port associated with the slot pair may be specified when
entering the cross-connection.) A single input enters an active drop
cross-connection from any incoming STS-3 tributary of OC-48 high-speed
line 1E or 1W to the "A" slot and another active drop cross-connection from
the same incoming STS-3 tributary to the "B" slot. For example, Figure 8-9
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-1 tributary of OC-48 high-speed line 1E or 1W to the
same-numbered outgoing STS-1 tributary of the other OC-48 high-speed
line. For example, Figure 8-8 shows incoming service STS-1 tributary 1 of
STS-3 tributary 3 (3-1) on OC-48 high-speed line 1W cross-connected to
outgoing service STS-1 tributary 1 of STS-3 tributary (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 8-8 shows service low-speed port 1 of slot
2B cross-connected to service STS-1 tributary 1 of STS-3 tributary 6 (6-1) on
OC-48 high-speed line 1W, and service STS-1 tributary 1 of STS-3 tributary 6
(6-1) on OC-48 high-speed line 1E cross-connected to service low-speed port 3 of
slot 6B. This is consistent with the 2-fiber bidirectional, line-switched ring
standard.
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