Circuit Pack Descriptions
Issue 8.0 July 2002
7-71
OC-12 (T939A) Circuit Pack Description 7
Purpose of Circuit 7
The OC-12 Optical Interface - 1.3µm Standard Performance [OC-12 (1.3 STD)]
circuit pack provides a bi-directional low speed interface between one
synchronous OC-12 optical signal (622.08 Mb/s) and an internal synchronous
STS-12/12c signal (622.08 Mb/s).
Faceplate LED 7
The OC12 (1.3 STD) circuit pack has a red FAULT LED on its faceplate
(Figure 7-22). 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 OC12 (1.3 STD) circuit pack.
The board controller on the OC12 (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 OC-12 signal from the
lightguide cross-connect panel (or equivalent) fails, the FAULT LED will flash on
and off.
Figure 7-22. OC12 (1.3 STD) (T939A) Circuit Pack
T939A
IN
OUT
nc-ft2000-004
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