What is the MDI/MDI-X button used for on the HP ProCurve 10/100 Hubs?
We first need some background information. In general, hub ports are MDI-X, transceivers and NICs are MDI. Switch ports are intended to seem like hub ports, so they are MDI-X. The following devices are MDI devices: • End node NICs • HP 10Base-T external transceivers (e.g., 28685B HP EtherTwist Transceiver) • HP 10Base-T internal transceiver modules (e.g., J2607A HP Twisted Pair Transceiver Module) The following devices are MDI-X devices: • HP 10Base-T hub ports (fixed RJ-45) (e.g., built-in RJ-45 ports on the J3200A HP Advancestack 10BT S Hub-12r) • HP 100Base-TX hub ports (fixed RJ-45) (e.g., J4091A HP ProCurve 100Base-T Hub 8) • HP switch ports (fixed RJ-45) (e.g., built-in RJ-45 ports on the J3102A HP Advancestack Switch 2000 Ethernet Module) • HP 100Base-TX internal transceiver modules (e.g., J3192C HP Advancestack 100Base-TX UTP Transceiver Module) Network communication over twisted-pair wires requires a “roll” of the signals from transmit at one end to receive at the other end. T
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