Foundry Networks OSI - Manual (Page 45)

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February 2003 © 2003 Foundry Networks, Inc. B-3
100BASE-TX/10BASE-T Pin Assignments
With 100BASE-TX/10BASE-T cable, pins 1 and 2 are used for
transmitting data, and pins 3 and 6 for receiving data.
Because all ports on this switch support automatic MDI/MDI-X
operation, you can use straight-through cables for all network connections
to PCs or servers, or to other switches or hubs. In straight-through cable,
pins 1, 2, 3, and 6, at one end of the cable, are connected straight through
to pins 1, 2, 3 and 6 at the other end of the cable. The table below shows
the 10BASE-T/100BASE-TX MDI and MDI-X port pinouts.
Note: If auto-negotiation is disabled for an RJ-45 port, the auto-MDI/
MDI-X pin signal configuration is also disabled.
RJ-45 Pin Assignments
Pin Number Assignment 1
1 Tx+
2 Tx-
3 Rx+
6 Rx-
1: The “+” and “-” signs represent the polarity of the
wires that make up each wire pair.
Pin MDI-X Signal Name MDI Signal Name
1 Receive Data plus (RD+) Transmit Data plus (TD+)
2 Receive Data minus (RD-) Transmit Data minus (TD-)
3 Transmit Data plus (TD+) Receive Data plus (RD+)
6 Transmit Data minus (TD-) Receive Data minus (RD-)
No other pins are used.