Maintenance Description
9-46 Issue 8.0 July 2002
to build a low-speed protection bus in the transmit direction. The LSSW circuit
pack in the IN slot controls the protection relays on the low-speed interface circuit
packs in slots 1A through 4B. The LSSW circuit pack in the OUT slot controls the
protection relays on the low-speed interface circuit packs in slots 5A through 8B.
The protection relays on the failed low-speed interface circuit pack switch the
three low-speed signals from DSX-3 or STSX-1 through the LSSW (IN) circuit
pack to the protection low-speed interface circuit pack. The protection low-speed
interface circuit pack processes the low-speed signals and sends a 155 Mb/s
signal to the OC48 TRMTR circuit pack. The board controller on the OC48
TRMTR circuit pack activates the selector circuitry to choose the 155 Mb/s signal
from the protection low-speed interface circuit pack.
In the receive direction, the board controller on the OC48 RCVR circuit pack
activates the switch circuitry to route the 155 Mb/s signal to the protection
low-speed interface circuit pack instead of the failed service low-speed interface
circuit pack. The board controller on the LSSW circuit packs activate the
protection relays on the failed low-speed interface circuit pack and the relays on
the LSSW (OUT) circuit pack to build a low-speed protection bus in the receive
direction. The protection low-speed interface circuit pack accepts the 155 Mb/s
signal from the OC48 RCVR circuit pack, processes the signal, and sends the
three low-speed signals through the LSSW (OUT) circuit pack to the failed
low-speed interface circuit pack where the switch is completed to the DSX-3 or
STSX-1 panel (or equivalent).
The FT-2000 OC-48 Lightwave System also supports unprotected low-speed
operation. It may be equipped without a protection DS3 or STS1E circuit pack.
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