cis 105 survey of computer information systems

CIS 105 Concepts and Terminology Unit 9

CIS 105

Survey of Computer Information Systems

Essential Concepts and Terminology

Study Unit 9

CIS 105 Concepts and Terminology Unit 9

Telecommunications. The process of sending information

of any kind over telephone lines.

CIS 105 Concepts and Terminology Unit 9

Public Switched Telephone Network (PSTN).

The technology enabling direct and almost instantaneous connections between any of nearly one-half billion telephones world-wide.

CIS 105 Concepts and Terminology Unit 9

Local Exchange Carriers (LEC).

Telephone services which provide direct, wired connections between subscribers without accessing long-distance carriers. Also known as local access and transport areas (LATA).

CIS 105 Concepts and Terminology Unit 9

Analog Telephone. A device that transmits a

continuously varying signal matching the acoustics of the human voice.

CIS 105 Concepts and Terminology Unit 9

Subscriber Loop Carrier (SLC).

A telephone system installation that connects as many as 96 subscribers (a local loop) to a local exchange. The SLC may transform local analog signals to digital signals before transmission to the local exchange.

CIS 105 Concepts and Terminology Unit 9

Interexchange Carrier (IXC).

A long-distance telephone company.

CIS 105 Concepts and Terminology Unit 9

Bandwidth. The data transmission capacity of

a communications channel. The bandwidth of a digital signal is measured in bits per second (bps); of an analog signal in Hertz.

CIS 105 Concepts and Terminology Unit 9

T1 Carrier. Specially conditioned copper wires

capable of transmitting 24 voice calls or 1.544 Mbps of data simultaneously.

CIS 105 Concepts and Terminology Unit 9

Fiber-Optic Cable. A bundle of thin strands of glass

used to transmit data by means of pulses of light.

CIS 105 Concepts and Terminology Unit 9

T3 Carrier. A fiber-optic cable capable of

transmitting 672 voice calls or 43 Mbps of data simultaneously.

CIS 105 Concepts and Terminology Unit 9

Microwaves. An electromagnetic wave with a

frequency of at least 1 gigahertz. High-frequency radio waves requiring line-of-sight transmission.

CIS 105 Concepts and Terminology Unit 9

Wireless Networks. Networks that use radio or infrared

signals (instead of cables) to transmit data from one network device to another.

CIS 105 Concepts and Terminology Unit 9

Cell Sites. A network of automatic repeating

transmitters which broadcast a signal throughout a limited geographic are (a cell).

CIS 105 Concepts and Terminology Unit 9

Mobile Telephone Switching Office (MTSO).

The technology connecting cell sites and connected to the standard PSTN telephone system.

CIS 105 Concepts and Terminology Unit 9

Modem. A device that transforms digital

signals into analog form and vice-versa. Modems send and receive data to and from computers over telephone lines.

CIS 105 Concepts and Terminology Unit 9

Modulation. The process of changing the

characteristics of a signal (for example, when a modem changes a digital pulse into an analog signal).

CIS 105 Concepts and Terminology Unit 9

Modulation Protocols. Rules set by international

standards organizations to ensure that modem made by different manufacturers can communicate correctly.

CIS 105 Concepts and Terminology Unit 9

Integrated Services Digital Network (ISDN).

A telephone company service that transports data digitally over dial-up or dedicated lines.

CIS 105 Concepts and Terminology Unit 9

Basic Rate ISDN (BRI). Service offering one or two 64

Kbps channels. Two channel ISDN allows a 128 Mbps data transfer rate, and one channel of data transfer during voice calls.

CIS 105 Concepts and Terminology Unit 9

Primary Rate ISDN (PRI). Service with 23 channels at 64

Kbps each and one signaliong channel, requiring a T1 carrier (1.544 Mbps).

CIS 105 Concepts and Terminology Unit 9

ISDN Adapter. The digital connection between a

computer and an ISDN line, also called a digital modem (a misnomer).

CIS 105 Concepts and Terminology Unit 9

Asymmetric Digital Subscriber Line (ADSL).

A type of DSL service for Internet access that enables download speeds of up to 1.5 Mbps.

CIS 105 Concepts and Terminology Unit 9

Coaxial Cable. A type of high-bandwidth

connecting cable with an insulated center wire surrounded by a grounded shield of braided wire.

CIS 105 Concepts and Terminology Unit 9

Cable Modem. A communications device that

delivers 0.5 to 1.0 Mbps or more of data, used to connect a computer to the cable TV infrastructure.

CIS 105 Concepts and Terminology Unit 9

Digitization. The transformation of media into

digital data.

CIS 105 Concepts and Terminology Unit 9

Broadband. A term used to refer to

communication channels that provide high bandwidth using multiplexing.

CIS 105 Concepts and Terminology Unit 9

End of Study Unit 9. Return to first slide

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Created by James Q. Jacobs