Comms 4 Lec SA1 Mod 1 [Part 2]

A tubular outer conductor surrounds the center conductor coaxially and the insulating material is air.

• Rigid Air Filled Coax

• Solid flexible Coax

• Coax

• Malleable Coax

Relatively expensive to manufacture, and to minimize losses, the air insulator must be free of moisture

• Rigid Air Filled Coax

• Solid flexible Coax

• Coax

• Malleable Coax

The outer conductor is braided, flexible, and coaxial to the center conductor.

• Rigid Air Filled Coax

• Solid flexible Coax

• Coax

• Malleable Coax

The insulating material is a solid nonconductive polyethylene material that provides both support and electrical isolation between the inner and outer conductors.

• Rigid Air Filled Coax

• Solid flexible Coax

• Coax

• Malleable Coax

It has lower losses than hollow cables and are easier to construct, install, and maintain.

• Rigid Air Filled Coax

• Solid flexible Coax

• Coax

• Malleable Coax

Coaxial Cable: Advantage

• • More secure

• • Can be used over longer distances

• • Can support more stations on a shared-media network

• • Can support less stations on a shared-media network

• • Can be used over shorter distances

Coaxial Cable: Disadvantage

• • Poor cost-to-performance ratio

• • Low reliability

• • High maintenance

• • High instability

• • High reliability

• Coaxial cables are categorized by their Radio Government (RG) ratings.

• True

• False

• Each RG number denotes a unique set of physical specifications, including:

• • wire gauge of the inner conductor

• • thickness and type of the inner insulator

• • construction of the shield

• • size and type of the outer casing.

• • size and type of the outer cabling

RG-59

• Impedance: 75

  Use: Cable TV

• Impedance: 50

  Use: Cable Broadcast

• Impedance: 50

  Use: Thin Ethernet

• Impedance: 50

  Use: Thick Ethernet