User's Manual

GLOSSARY

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234839, Revision 2.2

Input/Output Device

A device that transfers information into or out of a computer.

Interface

A physical point of interconnection between two devices where electrical signal levels, timing, handshaking and pin numbers

are defined. The devices, rules or convention by which one component of a system communicates with another.

Interference

Undesirable disturbances or distortions in a data transmission signal.

I/O

Input/Output. The transfer of information into and out of a computer.

Kermit

Kermit is a file transfer protocol developed for operating systems that could not support the XModem protocol.

Light Emitting Diode (LED)

A diode that glows when a current flows through it. Often used as an indicator light.

Link

A circuit or transmission path, including all equipment, between a sender and a receiver.

Local Echo

A method of communication in which your modem or software displays data locally on your screen, without relying on the

host computer to echo the characters back.

Local Command State

Also called Terminal Command State. When a computer is communicating with a local modem. The local mode, assumes all

commands are for it and acts on the AT commands. As opposed to being connected to a remote modem (see On-Line State).

Local Rx Address

4 digit phone number/address of the modem that you are dialing. Each modem, within a point to multipoint network, must

have a unique Rx address, otherwise more than one modem will be dialed. Used when dialing a remote modem. In point to

point communication, there is no dialing so it does not matter if both modems have the same Rx Address.

Log

List of information concerning the modem. See Fault Log, Physical Layer Log, and Serial Layer Log.

Loop-back

Directing signals back toward the source at some point in the communications path. Used in testing RFI-9256.

Main Port

Port connected to full RS-232 (7 wire) cable. Cable contains Tx, Rx, DCD, RTS, CTS, DTR, and ground. Allows hardware

flow control (hardware handshaking).

Master

Active Modem that synchronises the slave modems to enable the transmission of information. Can communicate with all

slaves in its network.

Modem

Modulator/Demodulator. A device to convert data from a computer or terminal into a form suitable for transmission across

a telephone system.

Modem Returns Response Codes

Suppresses (when activated) the Response Codes, so that they are not displayed on the terminal.