Fec (Forward Error Correction); Cdr (Clock Data Recovery); Transceiver Rate - Viavi Xgig User Manual

General Settings

FEC (Forward Error Correction)

This setting only applies to 16G Fibre Channel ports with the
10GigE ports on the 2 port 10G Multi-function Xgig blade, and 10GigE ports at all speeds on
Xgig1000 systems. It allows you to specify whether FEC is enabled in the link or not. You can also
set this option to
link contains FEC traffic and will capture the traffic either way. This is the default setting.

CDR (Clock Data Recovery)

This setting only applies to the 10GigE ports on the 40G Xgig1000 chassis. The CDR cleans the
signal output after passing through the analyzer. This is similar to a Digital Retime, but the signal
is not completely re-created. It is just cleaned and re-clocked. The default setting is off.
Note: If you are using copper cables, turning the CDR setting on prevents the training signals
from passing through the analyzer. If you want training signals to come through when using
copper cables, turn this setting off.

Transceiver Rate

This option is enabled only if it applies to the transceiver used by the hardware ports you have
selected. For other transceivers, this option is grayed out.
For 8G Blades Only
The Transceiver Rate
default industry standard setting may introduce errors when switching speeds. Switching rates to
lower rates may introduce momentary errors during the switching process in the downstream data,
even in Analog Passthrough
Analog Passthrough
options available are described below.
• Standard
speed by the transceiver and "low" for all other speeds).
This setting is industry standard, and is typically used in most environments. However, this
setting may result in momentary errors when speeds are switched between higher and lower
speeds. A warning is displayed when the above condition is detected when you are trying to
switch speeds.
•
High
the maximum supported by the transceiver).
This setting is recommended if you experiencing momentary errors when switching port
speeds. This setting will eliminate switching errors, but results in lower light sensitivity for
speeds below the maximum rated speed for the transceiver. If the incoming signal is not
strong, errors that result from signal attenuation may occur if this setting is used.
For 16G Blades Only
This option is only applicable to ports supporting a maximum speed of 14.0250 Gbps.
Xgig Analyzer User's Guide
, and the Analyzer software will automatically determine whether or not the
Auto
option sets how the transceiver reacts to the fiber-optic light source. The
mode. Errors introduced in the switching process can be avoided in
mode by selecting the
- Use industry standard setting (Rate select set "high" for the maximum supported
- Set rate select to "high" for all speeds (Results in lower light sensitivity at speeds below
Chapter 4, Xgig TraceControl Capture Configuration
Link Speed
Set rate select to "High" for all speeds
set to 14.0250 Gbps,
. The two
105