Dell Brocade G620 Brocade 8.0.1 Fabric OS Command Reference - Page 700

portCfgFec portCfgFec Enables or disables Forward Error Correction (FEC) or FEC through Transmitter Training Signal (TTS) on 16 Gbps and 10 Gbps Fibre Channel links. Synopsis portcfgfec --enable [-FEC] [-TTS] [-force | -f] [slot/]port [-port] portcfgfec --disable [-FEC] [-TTS] [-force | -f] [slot/]port [-port] portcfgfec --show [slot/]port [-port] portcfgfec --help Description Use this command to enable or disable Forward Error Correction (FEC) or Transmitter Training Signal (TTS) on a specified port or on a range of ports, or to display the configuration. FEC provides a mechanism for reducing error rates during data transmissions over 16 Gbps Fibre Channel links. When FEC is enabled on a port, the sender adds systematically generated error-correcting code (ECC) to its data transmission. This mechanism allows the receiver to detect and correct errors without needing to get additional information from the sender. If the TTS mode is enabled, the port negotiates FEC through TTS. TTS and 64B/66B are mutually exclusive. At fixed speed, TTS is not compatible with 64B/66B at the peer port and the final port state will be "No_Sync". In auto negotiation, the local port will try the TTS encoding; if the other end is not compatible, then the local port will try the 8B/10B encoding and the port will settle in "N8" port speed if the peer port also supports 8B/10B encoding. Thus, the TTS mode should only be enabled if a similarly TTS-capable and enabled device is connected to the port. The Brocade implementation of FEC is supported on 16 Gbps platforms and enables the switch to recover bit errors in 16 Gbps and 10 Gbps data streams. The FEC encoding can correct one burst of up to 11 error bits in every 2,112-bit transmission. The error correction covers both frames and primitives. There is no loss of bandwidth or added transmission data rate overhead to the 16 Gbps FC link. By default, FEC without TTS is enabled switch-wide on all 16 Gbps platforms but FEC via TTS is not enabled. If FEC is already enabled on the ports, enabling FEC has no effect. If a range of ports is specified, some of which are already in the requested configuration, a notification is generated, and no action is taken for those ports only. All other ports in the specified range are updated. Enabling or disabling FEC is disruptive to traffic. The command prompts for confirmation to continue with enabling or disabling TTS or FEC via TTS for the online ports. You can override the prompt for confirmation with the -force option. When used with the --show option, the command displays the following information for the specified ports: Port The port index number FEC Capable Displays YES if the port supports FEC. Displays NO if the port does not support FEC. FEC Configured Displays ON if FEC is enabled on the port (default). Displays OFF if the feature is disabled. 676 Brocade Fabric OS Command Reference 53-1004112-02