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Heavy Duty Edge Switches Installation and User Guide(07/05)
58
4.2 Auto-cross (MDIX),
Auto-negotiation and Speed-sensing
The RJ-45 ports independently support auto-cross (MDI or MDIX) in auto-
negotiation mode and will work properly with all the other connected devices with RJ-
45 port whether it supports Auto-negotiation or not (e.g 10Mb Hub) or fixed mode at
10Mb or 100Mb Half/Full Duplex(managed switch). No cross-over cable is required
while using the LBHXXX’s Auto-negotiation port to other devices. Operation is
according to the IEEE 802.3u standard.
When a RJ-45 cable connection is made, and each time a LINK is enabled,
auto-negotiation takes place. The Black Box Heavy-Duty LBHXXX advertises its
capability for 10 or 100 Mbps speed and F/H duplex mode, and the device at the other
end of the cable should similarly advertise / respond and both sides will agree to the
speed and mode being used. Depending upon the device connected, this will result in
agreement to operate at either 10 Mbps or 100Mbps speed, full- or half-duplex mode.
Even a managed switch will connect at fixed mode (100Mb Full Duplex), the
LBHXXX will connect at 100Mb Half duplex only. Since the Auto-negotiating
LBHXXX will advertise the speed only and not look for the duplex mode set on the
other side.