Chapter 4 Ethernet Media; Cabling Types; Attachment Unit Interface (Aui) - Cabletron Systems 100BASE-FX Cabling Manual

Enterasys 100base-fx transceivers: user guide

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Ethernet Media

This chapter examines the physical characteristics and requirements of both physical cabling and the

connectors and ports used with the cabling in Ethernet , Full-Duplex Ethernet, and Fast Ethernet

environments.

Attachment Unit Interface cable (referred to hereafter as AUI cable) is a shielded,

multistranded cable that is used to connect Ethernet network devices to Ethernet

transceivers. AUI cable should be used for no other purpose. AUI cable is

available in two basic types: standard AUI and ofﬁce AUI.

AUI cable is made up of four individually shielded pairs of wire surrounded by

an overall cable shielding sheath. The doubled shielding makes AUI cable more

resistant to electrical signal interference than other, lighter cables, but increases

the signal attenuation suffered over long distances.

AUI cables are connected to other devices through DB15 connectors. The

connectors of an AUI cable run from Male to Female at all times. Any transceiver

cable that uses a Male/Male or Female/Female conﬁguration is a non-standard

cable, and should be avoided.

Chapter 4

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