LED IndicationOperation Status RemarksLive LED (D4)(Green)Busy LED (D3)(Red)Off On Unit Busy A Channel is busy (use anotherfrom Ch1 - Chx)-Off All channels are Idle. -Flash 80ms (On/Off) x3/ 400msOffDownloading firmware -T1 Alarm ModeRefer to following figure for LED pattern information. LED indications for the T1 are listed inTable 2-19 T1 LED Indications on page 2-61.LOS red120 msgreenredgreenredgreenredgreenAISOOFRAI1 cycle 3.8 sec (120ms x 32=3840 ms)Figure 2-84 1PRIU-C1 LED Indication Pattern of Layer 1 on T1 UnitTable 2-19 T1 LED IndicationsAlarm Details of the alarm The LED indication patternLOS LOS (Loss of Signal (Red Alarm))No Signal (Analog Interface)Following an alarm blink (red, green, red, green), a redLED lighting up.AIS AIS (Alarm Indication Signal (BlueAlarm))Following an alarm blink (red, green, red, green), a redLED flashes on and off slowly twiceOOF OOF (Out of Frame (Red Alarm)) Following an alarm blink (red, green, red, green), a redLED and a green LED flash on and off 3 times simultane-ously.RAI RAI (Remote Alarm Indication (YellowAlarm))Following an alarm blink (red, green, red, green), a greenLED flashes on and off twice.No alarm System does LED controlE1 Alarm ModeRefer to following figure for LED pattern information. LED indications for the E1 are listed inTable 2-20 E1 LED Indications on page 2-62.ISSUE 6.0 SL1100Hardware Manual 2-61
