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Chapter 3. Configuration
3-30 MX2800 STS-1 User Manual 61200659L1-1
VT/Port Traps
Trap If enabled, the unit issues a trap when...
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).
Failure
VT-LOP (VT Path Loss of Pointer)
When the unit fails to find a valid VT pointer. A
VT LOP defect is declared when either a valid
pointer is not detected in eight consecutive VT
superframes, or when eight consecutive VT
superframes are detected with the NDF set to
"1001" without a valid concatenation indicator. A
VT LOP failure is declared when the VT LOP
defect persists for 2.5 +/- 0.5 seconds.
VT-AIS (VT Path Alarm Indication Signal)
The unit is receiving a VT path alarm indication
signal. VT-Path AIS is specified as all ones in
bytes V1, V2, V3, and V4, as well as all ones in
the entire VT synchronous payload envelope. A
VT-Path AIS failure is declared when the VT-
Path AIS defect persists for 2.5 +/- 0.5 seconds.