ADTRAN 4200659L1 - Manual (Page 100)

Chapter 4. Status
4-10 MX2800 STS-1 User Manual 61200659L1-1
• LOS/AIS – indicates that the clock source is not valid due to an
LOS or AIS condition.
• F AIL – indicates that an internal hardware failure on the unit
prevents the clock source from being used.
• U NAVAILABLE – indicates that the user has specified a T1/E1
port to be used as an external clock source, but the port has not
been enabled.
VT/PORT STATE
This field displays the current alarm condition of the VTs/ports.
Possible conditions are given in the following chart:
VT/Port State
Alarm Description
OFF VT in unequipped and T1/E1 port is disabled.
OK VT/Port is in a normal state.
LOS (T1/E1 Loss of Signal)
The unit has lost the receive signal on a T1/E1.
CAIS (Carrier Side AIS)
The T1 is receiving all ones from the STS side
of the network.
LAIS (Loop Side AIS)
The T1 is receiving all ones from the DSX-1
interface.
XCV (T1/E1 Excessive Code Violations)
The controller card is receiving excessive code
violations, exceeding the threshold set by the
user (see XCV Threshold on page 3-12).