Hadeeelana

10-Sep-14

PHYSICAL MEDIA

Physical Media

Physical Media

1

10-Sep-14

Physical Media
Copper Coaxial Cable - Thick or Thin Unshielded Twisted Pair - CAT 3,4,5,5e&6 Optical Fiber Multimode Singlemode Wireless Short Range Medium Range (Line of Sight) Satellite

Physical Media

Copper Media: Coaxial Cable
Coaxial cable is a copper-cored cable surrounded by a heavy shielding and is used to connect computers in a network. Outer conductor shields the inner conductor from picking up stray signal from the air. High bandwidth lossy channel. but

Category RG-59 RGRG-58 RGRG-11 RG-

Impedance 75 Ω 50 Ω 50 Ω

Use Cable TV Thin Ethernet Thick Ethernet

Repeater is used to regenerate the weakened signals.

2

10-Sep-14

Copper Media: Twisted Pair
Twisted-pair is a type of cabling that is used for telephone communications and most modern Ethernet networks. A pair of wires forms a circuit that can transmit data. The pairs are twisted to provide protection against crosstalk, the noise generated by adjacent pairs. There are two basic types, shielded twisted-pair (STP) and unshielded twisted-pair (UTP).

Shielded Twisted Pair (STP)

3

10-Sep-14

Unshielded Twisted Pair (UTP)

Unshielded Twisted Pair (UTP)
Consists of 4 pairs (8 wires) of insulated copper wires typically about 1 mm thick. The wires are twisted together in a helical form. Twisting reduces the interference between pairs of wires. High bandwidth and High attenuation channel. Flexible and cheap cable. Category rating based on number of twists per inch and the material used CAT 3, CAT 4, CAT 5, Enhanced CAT 5 and now CAT 6.

4

10-Sep-14

Physical Media

Categories of UTP
UTP comes in several categories that are based on the number of twists in the wires, the diameter of the wires and the material used in the wires. Category 3 is the wiring used primarily for telephone connections. Category 5e and Category 6 are currently the most common Ethernet cables used....