NEC UNIVERGE SL2100, Hardware Manual

Page: 105 / 174

E1 Alarm Mode
Refer to following figure for LED pattern information. LED indications for the E1 are listed in
Table 2-25 E1 LED Indications on page 2-59 .
LOS
AIS
OOF
RAI
TS16
1 cycle 3.8 sec (120 ms x 32 = 3840 ms)
green
green
green
green
green
120 ms
Figure 2-76 LED Indication Pattern of Layer 1 on E1 Board
Table 2-25 E1 LED Indications
Alarm Details of the Alarm The LED Indication Pattern
LOS LOS (Loss of Signal (Red Alarm))
No Signal (Analog Interface) Following an alarm blink twice (green), a green LED lighting
up.
AIS AIS (Alarm Indication Signal (Blue Alarm)) Following an alarm blink twice (green), a green LED flashes
on and off slowly twice
OOF OOF (Out of Frame (Red Alarm)) Following an alarm blink twice (green), a green LED flash on
and off 3 times simultaneously.
RAI RAI (Remote Alarm Indication (Yellow
Alarm)) Following an alarm blink twice (green), a green LED goes
off.
TS16 TS16 (Receive Time Slot 16 all Alarm) An alarm blink repeat twice by 1 cycle.
No alarm System does LED control
The order of priority is set up to alarm in the order LOS → AIS → OOF → RAI → TS16.
ISSUE 1.0 SL2100
Hardware Manual 2-59