Multitech MTPSR1-202ST Guía de usuario descargar pdf (Pagina 92)

ProxyServer User Guide

MTPSR1-202ST

standard EIA/CCITT interface.

Dedicated Line: A communication line that is not switched. The term leased line is more common.

Default: This is a preset value or option in software packages, or in hardware configuration, that is

used unless you specify otherwise.

Device driver: Software that controls how a computer communicates with a device, such as a printer

or mouse.

Digital Cross-connect System (DCS): The CO device which splits and redistributes the T1 band-

width. the DCS takes time slots from various T1 lines and alters them to provide the needed connec-

tivity. DCS connections are made with software at an administrator’s workstation.

Digital Data: Information represented by discrete values or conditions (contrast “Analog Data”).

Digital Loopback: A technique used for testing the circuitry of a communications device. Can be

initiated locally, or remotely (via a telecommunications device). The tested device decodes and

encodes a received test message, then echoes the message back. The results are compared with

the original message to determine if corruption occurred en route.

Digital PBX: A Private Branch Exchange that operates internally on digital signals. See also “Ex-

change”.

Digital Service, level 0 (DS0): The worldwide standard speed (64 Kbps) for digital voice conversa-

tion using PCM (pulse coded modulation).

Digital Service, level 1 (DS1): The 1.544M bps voice standard (derived from an older Bell System

standard) for digitized voice transmission in North America. The 1.544M bps consists of 24 digitally-

encoded 64 Kbps voice channels (north America) and 2.048M bps (30 channels) elsewhere.

Digital Signal: A discrete or discontinuous signal (e.g., a sequence of voltage pulses). Digital de-

vices, such as terminals and computers, transmit data as a series of electrical pulses which have

discrete jumps rather than gradual changes.

Digital Signaling Rates (DSn): A hierarchical system for transmission rates, where “DS0” is 64

Kbps (equivalent to ISDN B channel), and DS1 is 1.5 Mbps (equivalent to ISDN PRI).

Digital Transmission: A method of electronic information transmission common between computers

and other digital devices. Analog signals are waveforms: a combination of many possible voltages. A

computer’s digital signal may be only “high” or “low” at any given time. Therefore, digital signals may

be “cleaned up” (noise and distortion removed) and amplified during transmission.

Digitize: To convert an analog signal to a digital signal.

DIP switch (pronounced “dip switch”): A set of tiny toggle switches, built into a DIP (dual in-line

package), used for setting configurable parameters on a PCB (printed circuit board).

Driver: A software module that interfaces between the Operating System and a specific hardware

device (i.e. color monitors, printers, hard disks, etc.). Also known as a device driver.

Drop and Insert: The process where a portion of information carried in a transmission system is

demodulated (“Dropped”) at an intermediate point and different information is included (“Inserted”) for

subsequent transmission.

DTE (Data Terminating Equipment): A term used to include any device in a network which gener-

ates, stores or displays user information. DTE is a telecommunications term which usually refers to

PCs, terminals, printers, etc.

DTMF (Dual-Tone MultiFrequency): A generic push-button concept made popular by AT&T

TouchTone.

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