Nortel Networks 1000BASE-XD Manual De Usuario
Troubleshooting
204515-C
4-5
The fiber MDAs use only multimode 62.5/125
µm fiber cable. The Nortel
Networks 100BASE-FX MDA is not supported on single-mode fiber. SC
connectors are used on 2-port 100BASE-FX MDAs, and MT-RJ connectors are
used on 4-port 100BASE-FX MDAs.
connectors are used on 2-port 100BASE-FX MDAs, and MT-RJ connectors are
used on 4-port 100BASE-FX MDAs.
Cables for the GBICs vary depending on the specific GBIC type. For details of the
cable requirements for GBICs, refer to
cable requirements for GBICs, refer to
.”
Autonegotiation Modes
Port connection problems can occur when a port (or station) is connected to
another 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 another
station).
another 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 another
station).
The Passport 8100 modules negotiate port speeds according to the IEEE 802.3u
autonegotiating standard. The switch adjusts (autonegotiates) its port speed and
duplex mode to match the best service provided by the connected station, up to
100 Mb/s in full-duplex mode.
autonegotiating standard. The switch adjusts (autonegotiates) its port speed and
duplex mode to match the best service provided by the connected station, up to
100 Mb/s in full-duplex mode.
The following autonegotiation problems can occur:
•
If the connected station uses a form of autonegotiation that is not compatible
with the IEEE 802.3u autonegotiating standard, the Passport 8100 module
cannot negotiate a compatible mode for correct operation.
with the IEEE 802.3u autonegotiating standard, the Passport 8100 module
cannot negotiate a compatible mode for correct operation.
•
If the autonegotiation feature is not present or is not enabled at the connected
station, the Passport 8100 module may not be able to determine the correct
duplex mode.
station, the Passport 8100 module may not be able to determine the correct
duplex mode.
In both situations, the Passport 8100 module autosenses the speed of the
connected station and, by default, reverts to half-duplex mode. If the connected
station is operating in full-duplex mode, it cannot communicate with the switch.
connected station and, by default, reverts to half-duplex mode. If the connected
station is operating in full-duplex mode, it cannot communicate with the switch.