Table 2: Feature History
DescriptionRelease InformationFeature Name
Enhanced Q-Margin is supported
for Forward error correction (FEC)
and performance monitoring on
CoherentDSP Controllers for 1.2T
and 1.2TL cards. This enhanced
Q-margin value is calculated based
on the maximum number of errors
for each frame. An attribute that is
called instantaneous Q-margin is
displayed in the output of the show
controllers coherentDSP
command. The lower the delta
value between the instantaneous
Q-margin value with the Q-margin
value, the better the FEC
performance of the NCS 1004
system. The instantaneous
Q-margin values thus help you to
optimize the system with
continuous error correction in
subsea transport networks.
Command modified:
• show controllers
coherentDSP
Cisco IOS XR Release 7.3.1Enhanced Q-Margin Support
Enhanced Q-Margin Support
From Release 7.3.1 onwards, enhanced Q-Margin is supported for Forward error correction (FEC) and
performance monitoring on CoherentDSP controllers for 1.2T and 1.2TL cards. Enhanced Q-margin provides
a better error free signal in the optical link. The enhanced Q-margin value is calculated based on the maximum
number of errors per frame. An attribute that is called instantaneous Q-margin is displayed in the output of
the show controllers coherentDSPcommand. The lower the delta value between the instantaneous Q-margin
value with the Q-margin value, the better the FEC performance of the NCS 1004 system.
To view Q-margin and enhanced Q-margin values for FEC on CoherentDSP controllers, see Verifying FEC
on CoherentDSP Controllers, on page 15.
To view Q-margin and enhanced Q-margin values for performance monitoring on CoherentDSP controllers,
see Configuring PM Parameters.
Configuring FEC on CoherentDSP Controllers
To configure FEC on the CoherentDSP controller, use the following command:
configure
controller coherentDSP R/S/I/P
Configuring Controllers
14
Configuring Controllers
Configuring FEC on CoherentDSP Controllers
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