Nortel 1000BASE-XD Using Manual

Also see for 1000BASE-XD: Installation guide

Contents

Troubleshooting204515-C 4-5The fiber MDAs use only multimode 62.5/125 μm fiber cable. The NortelNetworks 100BASE-FX MDA is not supported on single-mode fiber. SCconnectors are used on 2-port 100BASE-FX MDAs, and MT-RJ connectors areused on 4-port 100BASE-FX MDAs.Cables for the GBICs vary depending on the specific GBIC type. For details of thecable requirements for GBICs, refer to Appendix A, “Technical Specifications.”Autonegotiation ModesPort connection problems can occur when a port (or station) is connected toanother port (or station) that is not operating in a compatible mode (for example,connecting a full-duplex port on one station to a half-duplex port on anotherstation).The Passport 8100 modules negotiate port speeds according to the IEEE 802.3uautonegotiating standard. The switch adjusts (autonegotiates) its port speed andduplex mode to match the best service provided by the connected station, up to100 Mb/s in full-duplex mode.The following autonegotiation problems can occur:• If the connected station uses a form of autonegotiation that is not compatiblewith the IEEE 802.3u autonegotiating standard, the Passport 8100 modulecannot negotiate a compatible mode for correct operation.• If the autonegotiation feature is not present or is not enabled at the connectedstation, the Passport 8100 module may not be able to determine the correctduplex mode.In both situations, the Passport 8100 module autosenses the speed of theconnected station and, by default, reverts to half-duplex mode. If the connectedstation is operating in full-duplex mode, it cannot communicate with the switch.