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3000 Series User Guide 37
E1 Module
This module has three amber status lights.
Light Indicates . . .
ALM
Alarm condition indicating the following:
• Alarm Indicator Signal (AIS)
• Remote Alarm Indicator (RAI)
• Loss of Carrier, Loss of Signal
TST
Module is in loopback test mode.
LOS
Loss of sync indicating that the module is unable to
sync to the incoming data stream.
ALM
E1
TST
LOS