9
Hardware Installation and Network Topology
C H A P T E R
1
Straight-through vs. crossover cables
Ports on the switch are wired MDI so you can use a straight-through
cable when connecting to a Fast Ethernet repeating hub port, which is
usually wired MDI-X. For direct connection to another MDI port
(workstation, server, or another switch), you must use a crossover
cable. The pinouts of MDI and MDI-X ports are shown below.
Connector pinouts
Switch or NIC RJ-45 (MDI)
Hub RJ-45 (MDI-X)
1
TX+
1
RX+
2
TX-
2
RX-
3
RX+
3
TX+
4
Unused
4
Unused
5
Unused
5
Unused
6
RX-
6
TX-
7
Unused
7
Unused
8
Unused
8
Unused
Determining which cable to use
Different switch and repeater manufacturers implement their port
configurations differently. The following guidelines are based on the
Intel Express 100BASE-TX Switching Hub (switch), the Intel Express
100BASE-TX Stackable Hub (repeater) and the EtherExpress™
family of adapters (server or workstation). These apply to the majority
of switches and hubs:
For this connection
Use this cable
Switch to repeater
Straight-through
Switch to server or workstation
Crossover
Switch to switch
Crossover
Repeater to server or workstation
Straight-through
NOTE
When making your own
cables, wires 1 and 2
must be a twisted pair
and 3 and 6 must be a
twisted pair.
Summary of Contents for Express 100BASE-TX
Page 1: ...Intel Express 100BASE TX Switching Hub User Guide Part No 654655 001 ...
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