CIS 105 Survey of Computer Information Systems

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 viceversa. 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 dialup 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 Move to Study Unit 10 CIS 105 Home Page CIS 105 Concepts and Terminology Unit 9

Created by James Q. Jacobs

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