COMPUTER NETWORKING

PHYSICAL LAYER AND TRANSMISSION MEDIA

TRANSMISSION MEDIA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A cable that consists of color coded pairs of insulated copper wires that are twisted around each other to form pairs that are encased in a plastic sheath.
A
coaxial cable
B
twisted pair cable
C
fiber optic cable
D
None of the above
Explanation: 

Detailed explanation-1: -UTP cable is a 100 ohm copper cable that consists of 2 to 1800 unshielded twisted pairs surrounded by an outer jacket. They have no metallic shield. This makes the cable small in diameter but unprotected against electrical interference. The twist helps to improve its immunity to electrical noise and EMI.

Detailed explanation-2: -A twisted-pair cable simply refers to a cable in which pairs–one or more–of insulated strands of copper wire are twisted around one another. In the pair, one wire is used to transmit data, and the other is the ground reference.

Detailed explanation-3: -Unshielded twisted pair (UTP) cables are found in many Ethernet networks and telephone systems. For indoor telephone applications, UTP is often grouped into sets of 25 pairs according to a standard 25-pair color code originally developed by AT&T Corporation.

Detailed explanation-4: -Twisted pairs are made up of two insulated copper wires that are twisted together. The twisting is done to help cancel exterior electromagnetic interference. Crosstalk interference can come from other pairs within a cable. Each type of twisted pair cable has bandwidth and data rate specifications.

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