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OPERATION
EQUIPMENT LOW AVERAGE DENSITY (RED)
BLINKS WHEN THE EQUIPMENT SIGNAL'S AVERAGE ONES DENSITY IS LESS
THAN THAT SELECTED WITH THE ONES DENSITY OPTION.
LIGHTS WHEN CONDITION PERSISTS. OFF WHEN EQUIP NS INDICATOR IS ON.
EQUIPMENT ZEROS (RED)
BLINKS WHEN EXCESSIVE
CONSECUTIVE ZEROS ARE RECEIVED
FROM THE EQUIPMENT (DEPENDENT
ON SELECTION OF ONE'S DENSITY
OPTION).
OFF WHEN EQUIP NS INDICATOR IS ON.
POWER ON (GREEN)
LIGHTS WHEN POWER IS APPLIED.
ON
5 5 1
C S U
O N
NOTE: NOT USED IN UNFRAMED MODE.
3-2
LAD
0'S
NS
TM
N E T W O R K
E Q U I P
S Y N N S L B B P V A I S
0 ' S L A D N S T M
NETWORK-SIDE
INDICATORS
FIGURE 3-1. FRONT PANEL INDICATORS
EQUIPMENT NO SIGNAL (RED)
LIGHTS WHEN EQUIPMENT SIGNAL HAS CONSECUTIVE
ZEROS FOR LONGER THAN 150 MSEC.
EQUIPMENT-SIDE
INDICATORS
TEST MODE (RED)
LIGHTS WHEN THE CSU IS IN LOCAL TEST (LT), SELF TEST (ST),
REMOTE TEST (RT) MODE, DS0 SELF TEST, OR DS0 LOOPBACK.
E R R
C S U
E Q U I P
A L M
O U T
I N
M O N
O U T
ERROR OR ALARM (RED)
ERR
INDICATES NETWORK ERROR (BPV, FRAMING, CRC, OR SELF-
ALM
TEST).
BLINKS WHEN ERROR IS RECEIVED.
GOES OUT WHEN THERE ARE NO ALARMS FOR 30 SECONDS.
NETWORK ALARM INDICATION SIGNAL (RED)
AIS
LIGHTS WHEN BLUE ALARM (ALL ONES) IS
SEE
RECEIVED FROM THE NETWORK.
NOTE
NETWORK BIPOLAR VIOLATION (RED)
BPV
BLINKS WHEN BPV IS RECEIVED FROM THE NETWORK.
FLASHES FOR RAM FAILURE.
NETWORK LOOPBACK (RED)
LB
LIGHTS WHEN THE CSU IS IN LOOPBACK TOWARD
THE NETWORK.
FLASHES FOR ROM FAILURE.
NETWORK NO SIGNAL (RED)
NS
LIGHTS WHEN NETWORK SIGNAL LOSS IS GREATER
THAN 28.5 dB FOR LONGER THAN 150 MSEC.
NETWORK SYNCHRONIZATION (GREEN)
SYN
LIGHTS WHEN CSU HAS SYNCHRONIZED ON
NETWORK FRAMING.
SEE
NOTE
GOES OUT WHEN SYNCHRONIZATION IS LOST.
L T
S T
R T
I N
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