VeEX MPA User Manual page 433

MPA_e_manual_D07-00-129P_RevA00
Protocol Tabs
HP-UNEQ
LP-UNEQ
LP-RDI
LP-RFI
TU-AIS
TU-LOP
433
Higher-Order Path Unequipped Alarm. An all-zeros pattern is
inserted into the C2 byte of the HPOH. The C2 byte is the HP
Signal Label. (This type of error is used between Higher-
Order Path terminating equipment-PTE)
When a PTE receives this alarm, it will generate an AIS to
downstream NEs.
Lower-Order Path Unequipped Alarm. An all-zeros pattern is
inserted into the V5 byte of the LPOH. The V5 byte is the LP
Signal Label.
Only available when a LP mapping is selected.
Lower-Order Path Remote Defect Indicator. This generates
an LP-RDI condition using the V5 byte of the Lower-Order
Path OH.
This simulates a downstream NE at the LP layer, reporting a
failure to an upstream NE.
To do this, the system changes the pattern of the V5 byte in
the LPOH. The NE receiving the LP-RDI alarm should detect
a change to the V5 byte on the incoming signal.
Only available when a LP mapping is selected.
Lower-Order Path Remote Failure Indication. This generates
an LP-RFI alarm downstream to initiate a LP protection
switch.
Only available when a LP mapping is selected.
Tributary Unit Alarm Indication Signal. The transmission of an
TU-AIS to a downstream NE forcing that NE to send a TU-
AIS alarm to the next downstream NE. The NE will also send
an TU-RDI alarm to its upstream equipment.
Only available when a LP mapping is selected.
Tributary Unit Loss of Pointer. This simulates a loss of a valid
TU Pointer. When the downstream NE receives a TU-LOP, it
generates a TU-AIS alarm to its downstream equipment and
a TU-RDI alarm to its upstream equipment.