MX2800 STS-1 User Manual Configuration, Section 3
System Management
61204659L1-1A 3-33
VT/Port Alarms
Table 3-10 describes the VT/Port alarm indications.
NOTE
VT/Port alarms are cleared when the VT/Port is disabled or set to Auto
Enable after receiving an alarm.
Table 3-10. VT/Port Alarm Descriptions
Alarm Meaning Description
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 Exces-
sive Code Viola-
tions
The controller card is receiving excessive code violations, exceeding the thresh-
old (refer to XCV Threshold on page 3-16).
VT-LOP VT Path Loss of
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 Sig-
nal
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 syn-
chronous payload envelope. A VT-Path AIS failure is declared when the VT-Path
AIS defect persists for 2.5 ± 0.5 seconds.
VT-RFI VT Path Remote
Failure Indica-
tion
The unit is receiving a VT path remote failure indication. VT-RFI is declared
when the incoming VT path remote defect indication (VT-RDI, “1” in bit 4 of the
VT-Path Overhead byte (V5) in five contiguous frames) lasts for 2.5 ± 0.5
seconds.
VT-SLM VT Path Signal
Label Mismatch
A received signal label is mismatched if the VT label does not indicate
“unequipped” (0) or “asynchronously mapped” (2).
VT-UEQ VT Path
Unequipped
The received VT signal label is zero.
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