Protocol Tabs
193
Use screen A of the Optical Channel Data Unit (ODU) Overhead to edit the Path
Monitoring overhead and the Fault Type and Fault Location (FTFL) overhead bytes and
messages. The FTFL is a 256-byte message that is divided into two parts: the Forward
FTFL and the Backward FTFL.
Forward FTFL
The Forward FTFL consists of bytes 0 to 127 of the FTFL message.
Option
Description
Fault
Byte 0 is the Fault Identification field. It provides a fault
status and uses the following codes:
0000 0000: No Fault
0000 0001: Signal Fail
0000 0010: Signal Degrade
0000 0011 through 1111 1111 are reserved for future use.
OI
Bytes 1 through 9 are used for the Operator Identifier field.
OS
Bytes 10 through 127 are used for the Operator Specific
field.
Backward FTFL
The Backward FTFL consists of bytes 128 to 255 of the FTFL message.
Option
Description
Fault
Byte 128 is the Fault Identification field. It provides a fault
status and uses the following codes:
0000 0000: No Fault
0000 0001: Signal Fail
0000 0010: Signal Degrade
0000 0011 through 1111 1111 are reserved for future use.
OI
Bytes 129 through 137are used for the Operator Identifier
field.
OS
Bytes 138 through 255 are used for the Operator Specific
field.
ODU Path Monitoring Overhead
MPA_e_manual_D07-00-129P_RevA00
Summary of Contents for MPA
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