LED Indication
Operation Status Remarks
Live LED (D4)
(Green)
Busy LED (D3)
(Red)
Off On Unit Busy A Channel is busy (use another
from Ch1 - Chx)
-
Off All channels are Idle. -
Flash 80ms (On/
Off) x3/ 400ms
Off
Downloading firmware -
T1 Alarm Mode
Refer to following figure for LED pattern information. LED indications for the T1 are listed in
Table 2-17 T1 LED Indications on page 2-57.
Figure 2-79 1PRIU-C1 LED Indication Pattern of Layer 1 on T1 Unit
Table 2-17 T1 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 (red, green, red, green), a red
LED lighting up.
AIS AIS (Alarm Indication Signal (Blue
Alarm))
Following an alarm blink (red, green, red, green), a red
LED flashes on and off slowly twice
OOF OOF (Out of Frame (Red Alarm)) Following an alarm blink (red, green, red, green), a red
LED and a green LED flash on and off 3 times simultane-
ously.
RAI RAI (Remote Alarm Indication (Yellow
Alarm))
Following an alarm blink (red, green, red, green), a green
LED flashes on and off twice.
No alarm System does LED control
3.5 Power Failure Transfer (4COIDB-B1 only)
3.5.1 General
In the event of AC power failure, the specified trunk is directly connected to the specified extension
port as below. And SLT must be connected to the specified extension. The multiline telephone (2W)
does not work when the specified trunk is connected to the specified extension port.
J2 (CO1-4): Trunk Port 1
J3 (PF1): Extension Port 1
ISSUE 5.0
SL1100
Hardware Manual 2-57
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