150-357-200-02, Issue 2
Overview
HXU-357 List 1
February 9, 1999
7
Alarm Drivers
The microprocessor drives the alarm relays for the multiplexer unit. The relay
outputs are wire-ORed from both cards on the back left side of the Wideband
System 3190 chassis and are read by the HMU, which in turn combines this
information to generate Critical, Major, Minor, and Far-End alarm outputs.
Table 1.
HXU-357 LED Indicators
Indicator
Type
Illuminates when
…
FAULT (red)
Fault
a critical (CR), major (MJ) or minor (MN) alarm
condition exists.
ABNORMAL
(yellow)
Abnormal
an external status condition exists.
ACTIVE (green)
Active
the multiplexer is online.
CR (red)
Critical
a service-affecting fault exists or more than four DS1
inputs are removed or faulty.
MJ (red)
Major
a service-affecting fault exists or up to four DS1
inputs are removed or faulty.
MN (yellow)
Minor
a potential service-affecting fault exists.
FE (yellow)
Far-End
any remote alarm exists and also illuminates when
an alarm or loopback occurs at the far end.
PWR (green)
Power
power (A and B) is applied to the multiplexer card
and the card is operating normally.
PWR A (green)
Power Supply A
-48 Vdc is being supplied to leg A of the power
supply circuit. Located near the card connector.
PWR B (green)
Power Supply B
-48 Vdc is being supplied to leg B of the power
supply circuit. Located near the card connector.
LB (yellow)
Loopback
a local DS1 or DS3 loopback is active.
For a more complete description of Critical, Major, Minor,
Far-End and Abnormal alarms, see
