NEC Neax 2000 IVS2 Manual page 168

Lamp Indications
LAMP
COLOR
NAME
RUN Green
CRC Red
PCM Red
FRM Red
RMT Red
AIS Red
BL Red
2
NEAX2000 IVS ISDN System Manual
ND-70919 (E), Issue 1.0
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 loop-back 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.
CHAPTER 4 CIRCUIT CARD INFORMATION
FUNCTION
PN-24DTA-C (DTI)
Page 157