Nortel DMS-100 Series Maintenance Manual page 21

C-side clock receiver and monitor circuit
A voltage controlled crystal (VCC) filter circuit attenuates the impact of
both voltage and current changes on the 5-V power input to the card.
Faceplate hardware resources The NT6X51BA has the following sets of
resources on its faceplate:
activity status light emitting diodes (LED)
terminal access connector
The following figure shows NT6X51BA hardware resources.
NT6X51BA faceplate hardware resources
NT6X51BA
Inservice
Out of
Service
The activity status has two LEDs, one GREEN the other RED. When the
GREEN LED is lit, the LCM processor is in an active In-Service (InSv) or
In-Service-Trouble (ISTb) state. When the RED LED is lit, the LCM
processor is in an Out-of-Service (OOS) state, either manual-busy (ManB),
system-busy (SysB) or central-side busy (CBsy).
Color GREEN – lit when unit state is InSv or ISTb
Color RED – lit when unit state is ManB, SysB or CBsy
The terminal access connector is used for debugging
and should be used by Northern Telecom (Nortel)
personnel only.
DMS-100 Family Maintenance Manual ABSK007
Maintenance overview 1-9