Configuration Guide for Cisco NCS 1014, IOS XR Releases 26.x.x

Configure PRBS on EDFA2 card

Updated: June 18, 2026

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Use this procedure to configure Pseudorandom Bit Sequence (PRBS) on the Coherent Probe port of an EDFA2 card without requiring the maintenance state.

The EDFA2 card supports PRBS configuration only on Coherent Probe port.

For EDFA2 card, you can configure PRBS only for coherentDSP without setting the secondary admin state of the controllers to maintenance.

Use this task to configure PRBS without maintenance state.

Procedure

	1.	Enter the controller coherentDSP R/S/I/P command to enter the coherentDSP controller configuration mode. Example: `RP/0/RP0/CPU0:ios(config)#controller CoherentDSP0/0/0/7`
	2.	Enter the prbs mode {source \| sink \| source-sink} pattern {pn31 \| pn23 \| pn15 \| pn7} to configure the PRBS mode and pattern. Example: `RP/0/RP0/CPU0:ios(config-CoDSP)#prbs mode source-sink pattern pn15`
	3.	Commit the changes. Example: `RP/0/RP0/CPU0:ios(config-CoDSP)#commit`

Verify PRBS

Use these steps to verify CoherentDSP controller PRBS details and performance monitoring details.

Procedure

Run the show controllers coherentDSP rack/slot/instance/port prbs-details command to display PRBS details configured on a coherentDSP controller.

Example:

RP/0/RP0/CPU0:ios#show controllers coherentDSP 0/2/0/7 prbs-details
Tue Mar 11 03:13:34.425 IST

----------------------PRBS details------------------
PRBS Test              : Enable
PRBS Mode            : Source-Sink
PRBS Pattern          : PN7
PRBS Status             : Locked
PRBS Lock Time(in seconds)        : 1403
PRBS Bit Errors                     	       : 0
PRBS Found Count                         : 1
PRBS Lost Count                             : 0
PRBS Configured Time                   : 11 Mar 02:50:08 (1406 seconds elapsed)
PRBS First Lock Established Time: 11 Mar 02:50:11 (1403 seconds elapsed)
Result Summary                             : PASS

Run the show controllers coherentDSP rack/slot/instance/port pm current 30-sec|15-min|24-hours prbsto view the PRBS performance monitoring parameters on a coherentDSP controller.

Example:


RP/0/RP0/CPU0:ios#show controllers coherentDSP 0/2/0/7 pm current 15-min prbs
Tue Mar 11 03:21:31.173 IST
 PRBS in the current interval [03:15:00 - 03:21:31 Tue Mar 11 2025]
 PRBS current bucket type : Valid
 EBC          : 0           Threshold : 0         TCA(enable)  : NO
 FOUND-COUNT  : 0           Threshold : 0         TCA(enable)  : NO
 LOST-COUNT   : 0           Threshold : 0         TCA(enable)  : NO
 FOUND-AT-TS  : NULL
 LOST-AT-TS   : NULL
 CONFIG-PTRN  : PRBS_PATTERN_PN7
 STATUS       : LOCKED
Last clearing of "show controllers OTU" counters neve

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