VeEX MPA, User Manual

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Protocol Tabs
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RES-1 through
RES-9 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.
EXP-1 and EXP-2 Two bytes of the ODU overhead are reserved for
experimental use.
GCC1-1 and
GCC1-2 General Communications Channel 1, Byte 1 and Byte 2.
GCC2-1 and
GCC2-2 General Communications Channel 2, Byte 1 and Byte 2.
APS/PCC-1
through APS/PCC-
4 Automatic Protection Switching and Protection
Communication Channel, Byte 1, Byte 2, Byte 3, and Byte 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 Description
TCM Selection Selects a specific TCM field (TCM1 through TCM6).
BIP-8 One byte of the ODU TCM overhead is used to identify an
Error Detection Code signal, which is a BIP-8 signal.
BEI/BDI/STAT 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
MPA_e_manual_D07-00-129P_RevA00