Black-box 5000 User Manual download pdf (Page 259)

Glossary

257

Multiserver network. On incoming calls, the fax

signals are routed automatically from either the

PSTN or the Multiserver network to the fax

machine. On outgoing calls, the desired

destination network for the fax machine is

selected by the user.

FCC — A government board that has the power to

regulate all U.S.A. interstate communications

systems as well as all international

communications systems that originate or

terminate in the U.S.A.

FDX — See full-duplex.

feeder mux — Any compatible multiplexer

attached to a Multiserver unit. All of the ports

of a feeder mux are addressable by the network

so that connections can be made on an

individual basis.

FF, form feed — A control character used to tell a

terminal device to go to the top of the next

page.

flow control — The procedure for controlling the

transfer of data between two points in a data

network, such as between a terminal and a

multiplexor, to prevent loss of data when the

receiving device’s buffer reaches its capacity.

forced connection — A dedicated connection

between two channels in the network. Contrast

with switching.

four-wire circuit or four-wire line — A circuit using

two pairs of conductors, one pair for the

transmit channel and one pair for the receive

channel.

fox message — A test message (THE QUICK

BROWN FOX JUMPS OVER THE LAZY DOG.

1234567890), that contains all the letters of the

alphabet and all the numerals. This is usually

produced in the fox-message generator in a

Multiplexor.

full-duplex — Simultaneous two-way independent

transmission.

half-duplex — Transmission in one direction at a

time.

hardware reset — Resets date and time but retains

the current configuration. This reset is accessed

from the front of the Multiserver.

HDX — See half-duplex.

header — Pins on a circuit board on which a

jumper can be installed for hardware

configuration purposes.

host — The central computer (or computer

systems) that provides primary data processing

functions.

hub group — This term is most often used in

discussions of switching. A Multiserver 5000

unit and all attached feeder muxes are

considered a hub group.

Hz, hertz — A measure of frequency or bandwidth

equal to one cycle per second. Named after

experimenter Heinrich Hertz.

indicator lights — The light emitting diodes (LEDs)

on the front of the Multiserver unit.

input level — A level of relative analog signal

strength obtained from the attached telephone

equipment, as measured in the voice/fax

module.

input level display — A visual indication of the

input level as displayed by the voice/fax

module. Used as a diagnostic tool to monitor

the input signal level.

interconnect link — A Multiserver-to-Multiserver

composite link using ESI Protocol.

ISU, integrated service unit — An integral interface

device that combines the functions of a DSU

and a CSU. The 56K CSU/DSU module is an

ISU.

jumper — A miniature connector that fits over, and

electrically connects two pins.

Kbps, kilobits per second — One thousand bits per

second. (Example: 19,200 bps is 19.2 Kbps.)

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