ADTRAN 4200659L2, 4200659L1, 4175043L2 VT/Port Traps, If enabled, the unit issues a trap when

Chapter 3. Configuration

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.

3-30 MX2800 STS-1 User Manual 61200659L1-1