VeEX MPA User Manual page 195

MPA_e_manual_D07-00-129P_RevA00
Protocol Tabs
RES-1 through
RES-9
EXP-1 and EXP-2
GCC1-1 and
GCC1-2
GCC2-1 and
GCC2-2
APS/PCC-1
through APS/PCC-
4
OTN Transmit - OTN OH / TCM
The Transmit Optical Channel Data Unit (ODU) overhead bytes and messages can be
edited using three separate screens on the unit: ODU-A, ODU-B, and TCM.
The ODU overhead contains six Tandem Connection Monitoring (TCM) fields. The
following overhead bytes can be edited for each TCM field.
Option
TCM Selection
BIP-8
BEI/BDI/STAT
195
Nine bytes of the ODU overhead are reserved for future use.
These bytes are set to all zeros.
The RES-3 byte was replaced with the "PM and TCM"
byte for testing Round-Trip Delay measurements.
Two bytes of the ODU overhead are reserved for
experimental use.
General Communications Channel 1, Byte 1 and Byte 2.
General Communications Channel 2, Byte 1 and Byte 2.
Automatic Protection Switching and Protection
Communication Channel, Byte 1, Byte 2, Byte 3, and Byte 4.
Description
Selects a specific TCM field (TCM1 through TCM6).
One byte of the ODU TCM overhead is used to identify an
Error Detection Code signal, which is a BIP-8 signal.
The Backward Error Indication (BEI) and Backward Incoming
Alignment Error (BIAE) subfield is a four-bit signal sent in the
upstream direction to indicate that an error has been
detected.
The Backward Defect Indication (BDI) subfield is a single bit
sent in the upstream direction to indicate that a signal fail