Circuit Pack LEDs
Issue 1 May 2002
6-5555-233-143
Circuit Pack LEDs
Typically each circuit pack has three LEDs on the front panel visible at the front of
the carrier. There are some exceptions to this (for example, DS1CONV or IPSI
circuit pack) that are covered later in this section. On most circuit packs, the
LEDs indicate the following when lit. Exceptions to these indications are
explained in subsequent sections.
This section includes LED interpretation on the following circuit packs:
■ ‘‘LED Alarms without Alarm Log Entry or with Error Type 1’’
■ ‘‘Expansion Interface Circuit Pack LEDs’’
■ ‘‘Maintenance Circuit Pack LEDs’’
■ ‘‘DS1 CONV (TN574/TN1654) Circuit Pack LEDs’’
■ ‘‘Switch Node Interface LEDs’’
■ ‘‘Tone-Clock Circuit Pack LEDs’’
■ ‘‘IPSI LEDs’’
LED Alarms without Alarm Log Entry or with
Error Type 1
Whenever the system or a part of the system is reset, every affected circuit pack
will briefly light their red and green LEDs as they are initialized. Upon power up of
a newly installed system, several alarm indicators may remain lit until the circuit
packs are administered. These alarms should be ignored until administration is
completed.
Boards with a “P” suffix have downloadable firmware. If such a board has both its
green and yellow LEDs lit simultaneously, a download may be in progress and the
board will not appear to be recognized. Use either the SAT command status
firmware download or status firmware download last to verify this condition.
LED Color State Interpretation
Red Alarm The system has detected a fault in this circuit pack. The
alarm log should contain an on-board alarm for this circuit
pack or one of the maintenance objects associated with it.
The red LED is also lit briefly when a circuit pack is inserted or
reset. If the circuit pack passes its initialization tests, the LED
is extinguished. If a fault is detected, it remains lit.
Green Testing The system is currently running tests on this circuit pack as
part of background maintenance or demand testing. This
LED is also lit briefly during initialization tests when a circuit
pack is inserted or reset.
Yellow Busy The circuit pack is currently in use by the system.
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