Cisco NCS1004 Manual page 47

Configuring Controllers
Configuring Pseudo Random Binary Sequence
The secondary admin state of the coherentDSP or ODU4 controller must be set to maintenance before enabling
PRBS.
To enable the PRBS on the trunk port, use the following configuration command at the coherentDSP controller:
controller coherentDSP R/S/I/P prbs mode {source | sink | source-sink} pattern {pn31 | pn23 | pn15 |
pn7}
To enable the PRBS on the trunk port, use the following configuration command at the ODU4 controller:
controller odu4 R/S/I/P/L opu prbs mode {source | sink | source-sink} pattern {pn31 | pn23 | pn15 |
pn7}
When the PRBS is enabled on the trunk ports, you can view the following impacts in the corresponding client
ports:
• Client traffic is dropped in the direction of source to sink as the frames are overwritten by the PRBS
pattern.
• Remote fault is raised on the client ports nearer to the PRBS sink.
The following are the ODU4 PRBS combinations. The client ports must have physical loop back in all the
combinations.
• Near End client and Near End trunk ODU4
• Near End client and Far End client ODU4
• Near End client and Far End trunk ODU4
• Near End trunk and Far End trunk ODU4
The following sample diagram describes the ODU4 PRBS combination for Near End client and Near End
trunk.
Configuring Pseudo Random Binary Sequence
Configuring Controllers
47