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H-1
Appendix H
Ethernet Cabling
Introduction H-1.
This appendix details the unshielded twisted-pair (UTP) cables used for 10BaseT
Ethernet interconnection. UTP cable configurations are summarized in Figure H-
1.
UTP Cables H-2.
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 10BaseT
hub, usually via a network outlet. A patch cord cable is characterized by pin-to-
pin conformity (see Figure H-1).
Direct connection cables are used to make a direct connection between an
instrument and a host computer. A direct connection cable is characterized by
crossing the receive (RX) and transmit (TX) signals lines. This allows the RX line
input to become a TX output, and vice versa (see Figure H-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.