Circuit Pack Descriptions
7-62 Issue 8.0 July 2002
IS3 (LAA5) Circuit Pack Description 7
Purpose of Circuit 7
The IS3 Optical Interface - 1.3µm Standard Performance [IS3 (1.3 STD)] circuit
pack provides a bidirectional low speed interface between one synchronous IS-3
optical signal (155.52 Mb/s) and an internal synchronous STS-3/3c signal (155.52
Mb/s). The IS3 circuit pack is compatible with Release 7.1.0-ADR and later
software only.
Faceplate LED 7
The IS3 (1.3 STD) circuit pack has a red FAULT LED on its faceplate
(Figure 7-20). The red FAULT LED is continuously 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 IS3 (1.3 STD) circuit pack.
The board controller on the IS3 (1.3 STD) circuit pack detects hardware and
software faults on the circuit pack. When a fault occurs, the FAULT LED on the
circuit pack is continuously lighted. If an incoming IS-3 signal from the lightguide
cross-connect panel (or equivalent) fails, the FAULT LED will flash on and off.
Figure 7-20. IS3 (1.3 STD) (LAA5) Circuit Pack
FAULT
xxxxxxxxx_
Optical
Connector
OUT
IN
LAA5
IS3
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