Exam 4: Transmission Media

Coaxial cable can be used over longer distances and support more stations on a shared line than twisted pair.

A single orbiting satellite will operate on a number of frequency bands called ________ channels.

A communication ________ is a microwave relay station used to link two or more ground based microwave transmitter/receivers known as earth stations.

For ________ media the bandwidth of the signal produced by the transmitting antenna is more important than the medium in determining transmission characteristics.

A thin,flexible medium capable of guiding an optical ray is an ________.

A form of attenuation known as ________ is when a transmitted signal attenuates over distance because the signal is being spread over a larger and larger area.

Unshielded twisted pair provides better performance at higher data rates.

The least expensive and most widely used guided transmission medium for both analog and digital signals is ________.

Wireless transmission frequencies in the range of about 1 GHz to 40 GHz are referred to as ________ frequencies.Highly directional beams are possible at these frequencies.

Used for amateur radio,CB radio,and international broadcasts such as BBC and Voice of America,________ propagation is a signal from an earth based antenna reflected from the ionosphere back down to earth.

Twisted pair is much less susceptible to interference and crosstalk than coaxial cable.

Requiring line of site transmission and fewer amplifiers or repeaters than coaxial cable over the same distance,________ is used in long haul telecommunications.

________ is a general term used to encompass frequencies in the range of 3 kHz to 300 GHz.

Defined as an electrical conductor,or system of conductors,used either for radiating or collecting electromagnetic energy,unguided media uses an ________ to achieve transmission and reception.

________ twisted pair is subject to external electromagnetic interference,including interference from nearby twisted pair and from noise generated in the environment.

A ________ consists of two insulated copper wires arranged in a regular spiral pattern.

The most commonly used medium in the telephone network is twisted pair.

Defined as the power output in a particular direction compared to that produced in any direction by a perfect omnidirectional antenna,________ is a measure of the directionality of the antenna.

Twisted pair,coaxial cable and optical fiber are examples of ________ media,which provide a physical path along which signals are propagated.

Often used in LANs,________ transmission has a higher refractive index at the center which makes the light rays moving down the axis advance more slowly than those near the cladding.