Black-box 5000 User Manual download pdf (Page 262)

Multiserver 5000

260

point-to-point — A communications circuit or

transmission path connecting two points. In the

Multiserver unit that connection can be force-

connected (dedicated point-to-point) or

switched (switched point-to-point).

port — A physical connector on the back of the

Multiserver unit. It can be configured as a link,

or as a user channel. Also, an interface capable

of attaching to a device for communications

with another device.

protocol — The means used to control the orderly

exchange of information between stations of a

data link or on a data communications network

or system.

PTT, Post, Telephone, and Telegraph

Authority — A government agency that

functions as the communications common

carrier and administrator in many areas of the

world.

pulse dialing — Method used for call addressing in

rotary telephones by short pulses of on-

hook/off-hook. Also known as decadic pulsing

in Europe.

QAM, quadrature amplitude modulation — A

modulation technique that combines phase and

amplitude modulation to increase the number

of bits per baud.

RAM, random access memory — A storage device

into which data can be entered (written) and

read; usually (but not always) a volatile

semiconductor memory.

Rapid Relay technology — Four technologies (data

compression, speech compression, Fast-Packet

multiplexing, and automatic fax demodulation)

combined and used in Multiserver products.

RD, received data — An RS-232 data signal received

by the DTE from a DCE.

receive inhibit — A configuration option that

prevents the voice/fax channel from receiving

calls.

remote analog loopback — An analog loopback that

forms the loop at the line (analog output) side

of the remote modem.

remote channel loopback — A channel loopback

that forms the loop at the input (channel side)

of the remote multiplexor.

remote composite loopback — A link loopback that

forms the loop at the output (composite side)

of the remote multiplexor.

remote digital loopback — A digital loopback that

forms the loop at the input side of the remote

modem.

reorder — In a switching mode, the response to

most unsuccessful call attempts.

repeated ring — A configuration option for a KTS-

strapped voice/fax channel. When repeated

ring is configured, the local voice/fax channel

rings the attached telephone set in response to

a remote PBX ringing signal.

ringdown — Causes the local telephone to ring

when the remote telephone is lifted off-hook,

and vice versa.

RI, ring indicator — An RS-232 interface signal,

sent from the modem to the DTE, that indicates

that an incoming call is present.

RJ-type connector — A modular connector that

complies with certain telco standards.

ROM, read-only memory — A nonvolatile

semiconductor storage device manufactured

with predefined contents.

RS-232 — An EIA-recommended standard that is

the most common for connecting serial data-

processing devices. RS-232 specifies the

electrical characteristics of the signals in cables

that connect a DTE to a DCE. An RS-232

standard is functionally identical to CCITT

V.24/V.28.

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