Maintenance Description
Issue 8.0 July 2002
9-45
Figure 9-11. Electrical Low Speed Protection Switching
If a service low-speed interface circuit pack fails, the board controller on the circuit
pack sends the information to the LNCTL circuit pack via the BCLAN. If
appropriate, the LNCTL circuit pack broadcasts a bidirectional switch request to
the board controllers on the LSSW circuit packs, the service OC48 TRMTR circuit
pack, and the service OC48 RCVR circuit pack.
The board controller on the LSSW circuit packs activates the protection relays on
the failed low-speed interface circuit pack and the relays on the LSSW circuit pack
OC-48
SYSCTL
LNCTL
SYSMEM
LCLAN
BCLAN
1to48
(IN) (OUT)
(S)
(P)
Control
Transmission
LSSW LSSW
Signals
Low Speed
DS3/STS1E
DS3/STS1E
OC48 TRMTR
OC48 RCVR
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