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Chapter 4, Xgig TraceControl Capture Configuration General Settings
106 Xgig Analyzer User’s Guide
The Transceiver Rate option sets how the transceiver reacts to the fiber-optic light source. Setting
the option to
High may introduce momentary errors during the switching process from 16G to a
lower rate in the downstream data, even in Analog Passthrough mode. Errors introduced in the
switching process can be avoided in Analog Passthrough mode by selecting the rate select to
Low
for all speeds. The two options available are described below.
• High - Set rate select to “high” for the 16G fixed speed, and low for auto and all other speeds.
•
Low
- Set rate select to “low” for all speeds.
This setting will eliminate switching errors and is the default setting.
You should use the
High
option at 14.0250 Gbps if you are experiencing errors on the link at this
speed. However, note that if the link speed between your devices changes to 8G or below errors
will be introduced on the link even in Analog-passthrough mode. In this case, change the setting to
Low .
FCoE CRC Checking
Fibre Channel over Ethernet (FCoE) is the proposed mapping of Fibre Channel over selected full
duplex IEEE 802.3 networks. Different versions of the protocol have different formats and
different specifications for calculating the FCoE’s embedded FC-CRC value. This option allows
the Xgig hardware to calculate the FCoE embedded CRC value based on the latest version of the
protocol or disable calculation of this value.
Checking the check box enables selects the latest draft of the T11 standards committee
specification as of this Xgig Analyzer release. Unchecking the check box disables FCoE
embedded CRC calculation. When the FCoE embedded FC-CRC calculation is disabled, the
analyzer will not perform any actions (for example, Trigger, Arm, or Rollback) on the embedded
FC-CRC values. Also, Performance Monitor will no longer count FCoE embedded CRC error
events. This check box is checked by default.
Output Voltage
These settings specify output signal voltage for Xgig 3G SAS/SATA ports.
•
High -
Standard Operation (800 - 1300 mV) (default)
High voltage should be used for all standard SAS operations and for all standard SATA
operations with later versions of SATA.
• Low - Margin Testing (500 - 800 mV)
Low voltage should only be used for testing the margins cases of signal propagation or for
early versions of SATA. Early versions of SATA only support a short cable length and specify
this lower voltage range for signaling.