G Ethernet Cabling; Ethernet Cabling - Fluke 2680A User Manual

Introduction
This appendix details the unshielded twisted-pair (UTP) cables used for
10/100BaseT Ethernet interconnection. UTP cable configurations are summarized
in Figure G-1.
UTP Cables
There are two types of UTP cables: patch cord cables and direct connection cables.
Patch cord cables connect an instrument or host computer to an existing
10/100BaseT hub, usually via a network outlet. A patch cord cable has straight-
through by pin-to-pin connections (see Figure G-1).
Direct connection cables are used to make a direct connection between an
instrument and a host computer. A direct connection cable has the receive (RX)
and transmit (TX) signal lines crossed. These cables are also known as crossover
or cross-wired cables. This allows the RX line input to become a TX output, and
vice versa (see Figure G-1). This signal reversal is a requirement when making a
direct connection between an instrument and host computer. Be sure you use
twisted-pairs for the RX and TX lines.
Be sure to use CAT5 or better cable for a 100 Mbs network
connection.

Ethernet Cabling

Note
Appendix G
G-1