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Using the Centillion EtherSpeedII Switch Modules
B-2 207344-B
UTP Cabling
A 10BASE-T/100BASE-TX connection between two ports requires two twisted
pairs. The transmit data (TD) pair carries data out from the port transmitter.
The receive data (RD) pair carries data in to the port receiver.
The 10BASE-T/100BASE-TX TD and RD circuits must be connected as follows:
• Individual conductors must provide pin-to-pin continuity (TD+ to RD+,
TD- to RD-, and so on) between the EtherSpeedII switch module port and the
attached MDI port on a transceiver or other network interface.
• Each signal circuit must use a single twisted pair throughout the link.
• Standard Ethernet patch panels and cables provide the previous features.
10BASE-T/100BASE-TX MDI Ports and MDI-X Ports
In the 10BASE-T/100BASE-TX standard, MDI is the electrical and mechanical
interface specified for the 10BASE-T/100BASE-TX transceiver or network
interface card connector (for example, on the station at the end of a link).
MDI port pins 1 and 2 carry the transmit (TD) signal, and pins 3 and 6 carry the
receive (RD) signal as shown in Figure B-1
.
Figure B-1. MDI-X Internal Crossover (RJ-45 Example)
9729EA
Transmit
Receive
MDI port network
interface card or
transceiver port
Host module MDI-X port
(transmit and receive
connections reversed)
Transmit
Twisted pairs
Receive
1
2
3
6
1
2
3
6