Nx Networks 3000 - Manual (Page 55)

3000 Series User Guide 41
SDSL Module
This module has three amber status lights.
Light Indicates . . .
ALM Alarm condition indicating a loss of communication
between the SDSL module and the host processor.
TST Module is in loopback test mode.
LOS Loss of sync indicating that the module is not activated
with the DSLAM (Digital Subscriber Loop Access
Multiplexor).
ALM
SDSL
TST
LOS