Black-box 5000 User Manual download pdf (Page 258)

Multiserver 5000

256

DIT, direct in termination — A service offered by a

PBX which allows incoming calls to the PBX to

be routed directly to a selected telephone or

group of telephones without operator

intervention. Billing does not start until the

telephone answers.

DLC, data link control — A communications

protocol that sets up, controls, checks, and

terminates information transfer between two

stations on a data link.

downline loading — The process of sending

configuration parameters, or operating

software, from a controlling device to another

device.

DSP, digital signal processor — This microprocessor

is used in voice compression and fax

demodulation.

DSR, data set ready — An RS-232 interface control

signal that indicates that the modem is

connected to a telephone circuit.

DSU, data service unit — A DCE that replaces a

modem in connection to a DDS: a baseband

device, often included in the cost of the DDS

circuits.

DTE, data terminal equipment — The equipment

serving as the data source and/or destination.

May refer to computer ports, terminals, and

printers. Also, interface signals typically

presented by this equipment.

DTMF, Dual Tone Multifrequency — used for call

addressing in pushbutton telephones. Also

known as Multifrequency Pushbutton (MFPB)

in Europe.

DTR, data terminal ready — An RS-232 interface

control signal that indicates that a DTE is ready

for data transmission.

E&M — In industry usage, a signaling convention

between voice PBXs. As related to the

Multiserver’s voice/fax module, a strapping

option for compatibility with the tie-trunk side

of a voice PBX. There are 5 types (Type I

through Type V) of E&M strapping options in

domestic models, and 3 types (Types I, II, and

V) in international models.

EBCDIC, Extended Binary Coded Decimal

Interchange Code — An 8-bit IBM character

code.

echo — The return of transmitted data to its origin.

ENQ, enquiry — A control character used as a

request for identification or status in

communications protocols. For example, in the

Hewlett-Packard ENQ/ACK protocol, ENQ is

sent by the transmitting device to determine if

the destination terminal is ready for more data.

See also ACK.

equalizer — A device used by modems to

compensate for distortions caused by telephone

line conditions.

<esc>, escape — An ASCII or EBCDIC character

used to modify the meaning of the character

that follows (dependent on defined protocol).

It is often used to set equipment in different

modes of operation or to position a cursor on a

terminal.

fast busy signal — See Reorder.

Fast Packet multiplexing — A remote networking

technique that dynamically combines various

signals including voice, fax, async and sync data,

video, and LAN onto one communications

channel with 95% or better efficiency.

fax, facsimile — Transmission of hardcopy (written,

typed, or drawn) images through a voice/fax

channel.

Fax Demodulation — A technique for detecting a

Group 3 fax signal on the voice line and

reducing it to its original speed for transmission

across the link (64 Kbps to

9.6 Kbps). At the other side, the signal is

recognized as fax and is sent to the appropriate

device.

fax sharing device — A device used when a fax

machine is shared between the Public Switched

Telephone Network (PSTN) and the

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