VeEX MPA User Manual page 371

MPA_e_manual_D07-00-129P_RevA00
Protocol Tabs
AIS-V
LOP-V
PTR-V
LOM-V
RDI-V
RFI-V
REI-V
UNEQ-V
BIP-V
PAT SYNC
BIT ERR
371
VT Alarm Indication Signal. Indicates an all-ones
characteristic or adapted information signal was detected on
the VT. It is generated to replace the normal traffic signal
when it contains a defect condition in order to prevent
consequential downstream failures being declared or alarms
being raised. This is an alarm LED.
VT Loss of Pointer. Indicates that an invalid Pointer has
been received or a VT Pointer loss has been detected on the
incoming SONET signal. This is an alarm LED.
VT Pointer Adjustments. Indicates Pointer offsets or
adjustments between the VT payload and the OC-N frame
are occurring. This is a status LED.
VT Loss of Multiframe Alignment. Indicates a Loss of
Multiframe Alignment in the VT. This is an alarm LED.
VT Remote Defect Indicator. Indicates that a signal was
returned to the transmitting VT Terminating Equipment upon
detecting a Loss of Signal, Loss of Frame, or AIS defect. This
is an alarm LED.
VT Remote Failure Indicator. Indicates a defect on the VT
at persisted beyond the maximum time allocated to the
transmission system protection mechanisms. When this
occurs, the RFI is sent to the far end and initiates a path
protection switch. This is an alarm LED.
VT Remote Error Indicator. Indicates to the transmitting
node that an errored block has been detected at the VT
receiving node. This is an error LED.
VT Unequipped Payload. Indicates that an all-zeros
patterns has been detected in the VT Signal Label of the V5
byte. This is an alarm LED.
VT Overhead BIP-2 Code Violations. Indicates an error
occurred during a parity check, which involves grouping all
the bits in a block into units and then performing a parity
check of each bit position in the group. This is calculated over
the VT OH and payload of each VT. This is an error LED.
Pattern Sync Mismatch. Indicates a loss of pattern
synchronization. This is an alarm LED.
BIT Error. Indicates a Bit error was detected in the payload.