Dell Brocade G620 Brocade 8.0.1 Fabric OS Command Reference - Page 793

portDPortTest Roundtrip link latency Displays roundtrip link latency in nanoseconds or unknown when the test is in progress. Roundtrip link latency is the time required for the light to travel from a given port to the port at the remote side of the link and back again. Estimated cable distance The estimated physical distance of the interswitch link in meters. The Link distance for SPFs or ICL ports which do not support E_WRAP and O_WRAP have a precision of +/- 50 meters for 8 Gbps LWL SFPs, 8 Gbps ELWL SFPs, 10 Gbps SFPs, ICL ports, and QSPF ports and +/- 5 meters for 16 Gbps SFPs. Buffers required The number of buffers required for the given distance and speed. Irrespective of test frame size, the number of buffers required is calculated for 2112-byte frames. Failure report Displays details on the local port and remote port errors, if any, when the D_Port test fails. Use the --show all command to display the following test summary information: Port The port number on the local side of the link State The port state: OFFLINE or ONLINE SFP Capabilities Electrical loopback (E) or optical loopback (O), or both (E, O) Test Result PASSED, FAILED, or STOPPED Egress power The power values and power loss in the transmit path. The following values are displayed: power transmitted from the local side of the link (Tx), power received on the remote side of the link (Rx), the power loss, that is, the relative difference in power (Diff), and the status of the power loss (No Loss, within tolerable limits, and outside tolerable limits). Ingress power The power values and power loss in the receive path. The following values are displayed: power received on the local side of the link (Rx), power transmitted from the remote side of the link (Tx), the power loss, that is, the relative difference in power (Diff), and the status of the power loss (No Loss, within tolerable limits, and outside tolerable limits). Notes The execution of this command is subject to Virtual Fabric restrictions that may be in place. Refer to "Using Fabric OS Commands" and "Command Availability" for details. This command is supported only on Fibre Channel ports. SFPs must be Brocade-branded and run Fabric OS v7.0.0 or later. This command skips the optical loopback test for loopback plugs or when the port loops back to another D_Port in the same switch. The port error statistics may show incremented values after D_Port tests are successful due to port toggle operation at the end of the D_Port test. Brocade Fabric OS Command Reference 769 53-1004112-02