Chapter 4, Problem 1RQ

Program Description Answer

Telecommunications Industry Association (TIA)/Electronic Industries Alliance (EIA) do not recognize “Coaxial cable” for horizontal wiring because the possible cables are Unshielded Twisted Pair (UTP), Shielded Twisted Pair (STP), and fiber optic cable.

Hence, the correct answer is option “C”.

Explanation of Solution

Coaxial cable:

Coaxial cable is a copper cable that comes with a metal shield and other components that block signal interference.

• Bayonet Neill–Concelman (BNC) connectors use the coaxial cable for transferring the signal.
• The twisted-pair and fiber-optic cables replaced the coaxial cable.

Explanation for incorrect options:

UTP:

UTP refers to unshielded twisted pair cables. It is a copper-based cable with one or more insulated twisted pair wires covered in a plastic sheath. It transmits data through electric signals.

• The number of pairs in UTP increases the bandwidth. UTP will reduce crosstalk and electromagnetic interference.
• Therefore, TIA/EIA uses UTP cable for horizontal wiring.

Hence, option “A” is wrong.

STP:

STP is a copper-based cable with insulated twisted pair wires covered in a metallic shielding such as foil. It transmits data through electric signals.

• It provides more protection from radio interference and electromagnetic interference.
• Therefore, TIA/EIA uses STP cable for horizontal wiring.

Hence, option “B” is wrong.

Fiber optic:

Fiber optic cable contains one or more glass or plastic fibers in its core. It consists of two types: single-mode fiber (SMF) and multimode fiber (MMF). It transmits data through laser light or light-emitting diode (LED).

• It provides more bandwidth than metal cables and also allows longer transmission distances.
• Therefore, TIA/EIA uses fiber optic cable for horizontal wiring.

Hence, option “D” is wrong.