NEC NEAX 2000 IPS System Manual page 403

Lamp Indications
LAMP
COLOR
NAME
RUN Green
CRC Red
PCM Red
FRM Red
RMT Red
AIS Red
BL Red
Flashes at 120 IPM while this card is operating normally.
Remains lit when detecting Cyclic Redundancy Checking (CRC)
errors.
Remains lit when detecting PCM signal loss.
Remains lit when detecting Frame Alignment signal loss.
Remains lit when receiving Frame Alignment signal loss alarm from a
distant office.
Remains lit when a pattern of consecutive "1" is received. The distant
office transmits this signal for a loopback test.
B channel status
ON : More than 10 channels are busy
OFF : All channels are idle
Flash (60 IPM) : Only one channel is busy
Flash (120 IPM): 2 through 10 channels are busy
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FUNCTION
PN-24DTA-C (DTI)
NWA-008853-001 Rev.3.0
97ch4001.fm