Product data

Networking Hardware

NOTE: Male/female end connections will vary. Please be

sure you purchase a cable with the proper connectors to

attach your devices.

2.2.3 Null Modem (Crossover) Cable

A null modem serial cable allows two DTE (data terminal equipment) devices to communicate

directly without a DCE (data communications equipment) device, such as a modem. The null mo-

dem cable connects the Rx (receive) pins to opposing Tx (transmit) pins and CTS (clear to send)

pins to their opposing RTS (request to send) pins. Both ends of the cable terminate in DB-9 con-

nectors.

Figure 6. Null Modem Serial Cable

NOTE: Both straight-through and null modem serial cables

will vary in color, length, and male/female end connections.

They may look identical on the outside, but internally they

are different.

2.2.4 Ethernet Cable

Category 5 or 5e cables (Cat5) have four twisted pairs of conductors terminating in an RJ-45

connector. The conductors can either be solid or stranded. Solid conductor is less expensive,

however,itdoesnotprovidetheexibilityandresiliencyofstrandedconductor.Thesecablesare

most commonly used in LAN/WAN 100Mbit/s networks.

Figure 7. Standard Ethernet Cable