Circuit Pack Descriptions
7-80 Issue 8.0 July 2002
LSSW (LAA12B) Circuit Pack Description 7
NOTE:
The LAA12 circuit pack was rated MD as of January 1997. It was replaced
with the LAA12B circuit pack.
Purpose of Circuit 7
The Low Speed Switch (LSSW) circuit pack is a relay switch circuit pack used to
build a low speed protection bus in the transmit and receive directions for the DS3
Interface (DS3) and STS-1 Electrical Interface (STS1E) circuit packs.
Faceplate LED 7
The LSSW circuit pack has a red FAULT LED on its faceplate (Figure 7-24). The
red FAULT LED is lighted when a circuit pack failure is detected or when the
circuit pack loses power. If the circuit pack loses power, a separate path is
provided for power from the Line Controller (LNCTL) circuit pack to light the
FAULT LED on the LSSW circuit pack.
The board controller on the LSSW circuit pack detects hardware and software
faults on the circuit pack. When a fault occurs, the FAULT LED on the circuit pack
is lighted.
Figure 7-24. LSSW (LAA12B) Circuit Pack
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