Troubleshooting guide

MX2820 System Manual
5-30 61186003L1-1D
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 super
-
frames are detected with the NDF set to “1001” with-
out a valid concatenation indicator. A VT LOP is
declared when the VT LOP defect persists for 2.5
±0.5 seconds.
VAIS VT Path Alarm Indi-
cation Signal
The unit is receiving a VT Path alarm indication sig-
nal (VT-Path AIS-P is defined as all ones in bytes V1
and V2, as well as all ones in the entire VT synchro
-
nous payload envelope). A VAIS failure is declared
when the defect persists for 2.5 ±0.5 seconds.
RFI-V Remote Failure Indi-
cation - VT Path
The unit is receiving a VT Path remote failure indica-
tion (RFI-V is declared when the incoming VT Path
remote defect indication [VTRDI, “1” in bit 4 of the
VT-Path overhead byte, V5, in five contiguous
frames] lasts for 2.5 ±0.5 seconds.
SLM-V Signal Label Mis-
match - VT Path
A received signal label is mismatched if it does no
equal the locally provisioned value or the value
“equipped non-specific”.
UEQ-V Unequipped - VT Path The received VT path is unequipped if it is not provi-
sioned (Byte V5 of the received VT path overhead is
set to zero).
UEQ Port Unequipped The VT is not mapped to a T1/E1 port.
TST Test The VT/Port is in test mode.
Table 5-17. VT/Port Alarm Condition Descriptions (Continued)
VT/Port Alarm Definition Condition Description