Question # 1

the transmission signal coding method of TI carrier is called

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Bipolar

NRZ

Binary

Manchester

Number of bits per symbol used in biodot code is.

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5

7

8

9

The X.25 standard specifies a

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Technique for start stop data

Technique for dial access

DTE/DCE interface

None

Which of the following is considered a broad band communication channel.

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Coaxial cable

Fiber optics cable

Microwave circuits

All of above

Layer one of the OSI model is

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Physical layer

Link layer

Transport layer

Network layer

Which of the following performs modulation and demodulation?

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Fiber optics

Satellite

Coaxial cable

Modern

How many OSI layers are covered in the X-25 standart.

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Two

Three

Seven

Six

Which of the following transmission system provide the highest data rate to in individual device.

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Computer bus

Telephone lines

Voice and mode

Lease lines

A protocol is a set of rules governing a time sequence of events that must take place.

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Between peers

Between an interface

Between moderns

Across an interface

Which of the following might be used by a company to satisfy its growing communications needs.

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Front and processor

Multiplexer

Controller

All of the above

The interactive transmission of data with in a time sharing system may be best suited to.

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Simplex lines

Half duplex lines

full duplex lines

Biflex lines

In OSI network architecture the dialogue control and toke management are responsibility of

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Session layer

Network layer

Transport layer

None

The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as.

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Modulation

Demodulation

Synchronizing

Digitising

the loss in signal power as light travels donw the fiber is called.

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Attenuation

Progragation

scathering

Interruption

Which of the following is required to communicate between two computers.

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Communications software

Protocol

Communication Hardware

All of above including access to transmission medium

A examples of medium speed switched communications service is

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Series 1000

Data phone 50

DDD

All of above

Data communications monitors available on the software marked include.

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ENVIRON/1

TOTAL

BPL

Telnet

Which of the following is an advantage to using fiber optics data transmission.

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Resistance to data theft

Fast data transmission rate

Low noise level

All of above

Communication circuits that transmit data in both directions but not a the same time are operating in

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A simplex mode

A half duplex mode

A full duplex mode

An asynchronous mode

Avalanche photodiode receivers can detect bits of transmitted data by receiving.

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100 photons

200 photons

2000 photons

300 photons

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