MRV Communications MR2228-S2C User Manual download pdf (Page 34)

Table B-1. 10/100BASE-TX MDI and MDI-X Port Pinouts

Pin MDI Signal Name MDI-X Signal Name

1 Transmit Data plus (TD+) Receive Data plus (RD+)

2 Transmit Data minus (TD-) Receive Data minus (RD-)

3 Receive Data plus (RD+) Transmit Data plus (TD+)

6 Receive Data minus (RD-) Transmit Data minus (TD-)

4,5,7,8 Not used Not used

Note: The “+” and “-” signs represent the polarity of the wires that make

up each wire pair.

Straight-Through Wiring

If the twisted-pair cable is to join two ports and only one of the ports has an

internal crossover (MDI-X), the two pairs of wires must be straight-through. (When

auto-negotiation is enabled for any RJ-45 port on this switch, you can use either

straight-through or crossover cable to connect to any device type.)

Crossover Wiring

If the twisted-pair cable is to join two ports and both ports are labeled with an “X”

(MDI-X) or neither port is labeled with an “X” (MDI), a crossover must be

implemented in the wiring. (When auto-negotiation is enabled for any RJ-45 port

on this switch, you can use either straight-through or crossover cable to connect

to any device type.)

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MRV Communications MR2228-S2C User Manual Page 34