Multitech MTPSR1-202ST Guía de usuario descargar pdf (Pagina 88)

ProxyServer User Guide

MTPSR1-202ST

Access: The T1 line element made up of two pairs of wire that the telephone company brings to the

customer premises. The Access portion ends with a connection at the local telco (LEC or RBOC).

Accunet Spectrum of Digital Services (ASDS): The AT&T 56 Kbps leased (private) line service.

Similar to services of MCI and Sprint. ASDS is available in nx56/64 Kbps, where n=1, 2, 4, 6, 8, 12.

ACK (ACKnowledgement code) (pronounced “ack”): A communications code sent from a receiv-

ing modem to a transmitting modem to indicate that it is ready to accept data. It is also used to

acknowledge the error-free receipt of transmitted data. Contrast with NAK.

Adaptive Differential Pulse Code (ADCPM): In multimedia applications, a technique in which pulse

code modulation samples are compressed before they are stored on a disk. ADCPM, an extension of

the PCM format, is a standard encoding format for storing audio information in a digital format. It

reduced storage requirements by storing differences between successive digital samples rather than

full values.

Address: A numbered location inside a computer. It’s how the computer accesses its resources, like

a video card, serial ports, memory, etc.

AMI line coding: One of two common methods of T1 line coding (with B8ZS). AMI line coding places

restrictions on user data (B8ZS does not).

Analog signal: A waveform which has amplitude, frequency and phase, and which takes on a range

of values between its maximum and minimum points.

Analog Transmission: One of two types of telecommunications which uses an analog signal as a

carrier of voice, data, video, etc. An analog signal becomes a carrier when it is modulated by altering

its phase, amplitude and frequency to correspond with the source signal. Compare with digital

transmission.

Application Program Interface (API): A software module created to allow dissimilar, or incompatible

applications programs to transfer information over a communications link. APIs may be simple or

complex; they are commonly required to link PC applications with mainframe programs.

ASCII (American Standard Code for Information Interchange) (pronounced “askey”): A binary

code for data that is used in communications and in many computers and terminals. The code is

used to represent numbers, letters, punctuation and control characters. The basic ASCII code is a 7-

bit character set which defines 128 possible characters. The extended ASCII file provides 255

characters.

Asynchronous Transfer Mode (ATM): A very high-speed method of transmission that uses fixed-

size cells of 53 bytes to transfer information over fiber; also known as cell relay.

AT Commands: A standard set of commands used to configure various modem parameters, estab-

lish connections and disconnect. The “AT” is used to get the “attention” of the modem before the

actual command is issued.

Availability: The measure of the time during which a circuit is ready for use; the complement of

circuit “outage” (100% minus % outage = % available).

B7ZS (Bipolar 7 Zero Suppression) line coding: One method of T1 line coding (see also “B8ZS”

and “AMI”). B7ZS line coding does not place restrictions on user data (AMI does).

B8ZS (Bipolar 8 Zero Suppression) line coding: One of two common methods of T1 line coding

(with AMI). B8ZS line coding does not place restrictions on user data (AMI does). A coding method

used to produce 64 Kbps “clear” transmission. (See also “B7ZS” and “AMI” line coding)

Backbone: 1. A set of nodes and their interconnecting links providing the primary data path across a

network. 2. In a local area network multiple-bridge ring configuration, a high-speed link to which the

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