Term

Definition

AA

Auto Attendant (built-in or external). This feature acts as an automatic operator that directs incoming callers to stations by offering a menu of dialing prompts.

ABR

Automatic Busy Redial.

ACB

Automatic Callback.

ACD

Automatic Call Distribution. Allows incoming calls to be distributed to a group of ACD agents. The ACD Supervisor's LCD telephone displays ACD Agent and Group information which allows the Supervisor to monitor calls and assist agents.

ADM

Add-on Module---See DADM.

AMI

Alternate Mark Inversion.

ANI

Automatic Number Identification- Telephone number of the calling party is sent to the Strata DK system over incoming DID or Tie lines. This feature is provided by some long distance telephone service companies.

B-channel

Used in ISDN. Data or voice information is transmitted on the B-channels of an ISDN line at 64kpbs. The B-channel refers to the frequency range of transmissions on a copper pair; it is a logical, rather than physical channel. Also see BRI and PRI.
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B8ZS

Bipolar 8 Zero Substitution.

BGM

Background music -- Allows customer-supplied music to be sent to telephone speakers and external speakers.

BLF

Busy Lamp Field.

BPS

Bits Per Second -- Unit of measure that refers to the transmission speed (baud rate) of electronic signals. It is used when describing the Data Interface Unit and modem operation.

BRI

Basic Rate Interface -- ISDN line with 2B + 1D channel. BRI lines can have a U-interface with RJ-11 jacks and single twisted pair wiring, or RJ-45 four pair S/T interface wiring. BRI is a smaller ISDN interface than PRI.

BSIA

Base Station Interface Adapter -- Interface between the Strata Airlinkô Wireless Telephone  Base Stations and the host telephone system.
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CESID

Caller's Emergency Service Identification -- Telephone number for specific station or station location which is sent to the CAMA trunk.

CLASS

Custom Local  Area Signaling Services -- Defines a number of features offered by local telephone companies.

CLID or CND

Calling Line Identification or Calling Number Delivery -- Telephone number or name of the calling party sent to the Strata DK system over incoming ground or loop start CO lines. This feature is one of the "CLASS" features offered by some local telephone companies.

CO

Central Office -- The facility which houses switching equipment that provides telephone service (CO lines, E & M Tie lines, DID lines, Centrex lines, etc.) for the immediate geographical area.
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CODECs

Code/Decoder -- Semiconductors that allow the system to process analog-to-digital and digital-to-analog conversions.

CSU

Channel Service Unit. required between the CK PRI interface and the PRI line provider interface in most locations of the U.S.

CNIS

Calling Number Identification Services -- Caller ID for ISDN. CNIS is calling party information for outgoing and incoming calls sent to the ISDN network.

DADM

Digital Add-on-Module -- Optional device that connects to 2000-series digital telephones to provide the telephones with 20 flexible feature buttons that can be assigned individually for Direct Station Selection, System and Personal Speed Dial, and CO line access.

D-channel

Used in ISDN. This Channel transmit call control information (out-of-band signaling) for B-channels. The D-channel is a logical, not physical channel.
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DDCB

Digital Door Phone/Lock Control Unit -- A peripheral hardware unit compatible with designated digital telephone circuits that supports optional door phones (MDFBs) and provides door lock control.

DDSS

Digital Direct Station Selection Console -- A device that helps facilitate the processing of a heavy load of incoming calls. The DDSS connects only to designated digital telephone circuits, and is associated with a digital telephone.

DH

Distributed Hunt.

DID Line

 Direct Inward Dialing line -- Allows external callers to dial directly to an internal number.

DIL

Direct In Line -- Refers to two-way, standard CO trunk lines that are assigned to a particular extension or hunt group.

DISA

Direct Inward System Access -- Enables an outside party to access the Strata DK system internal stations or outgoing CO lines without having to go through an operator or automated attendant. An optional security code may be set to prevent unauthorized access to outgoing CO lines for through system calling.
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DKT

Digital Key Telephone.

[DN]

Directory Number.

DNIS

Dialed Number Identification Service -- Telephone number of called party is sent to the Strata DK over incoming DID or Tie Lines. This feature is provided by some long distance telephone companies.

DSS

Direct Station Selection -- Enables a telephone user (as well as a DSS console and ADM user) to call another station  with the touch of a flexible feature button.

DTMF

Dual-tone Multi-frequency -- Push-button tone dialing.

DVSU

A subassembly that equips a digital telephone with the capability to receive Speaker Off-hook Call Announce (OCA) calls. DVSU is nor required to receive Handset OCA (HS-OCA).

EKT

Electronic Key Telephone.

ESF

Extended Super Frame.
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FIFO

First-in, First-out.

HDCB

Electronic Door Phone/Lock Control Unit -- A peripheral hardware unit compatible with designated electronic telephone circuits that supports optional door phones (MDFBs) and provides door lick control.

HDSS

Electronic Direct Station Selection Console -- A device that helps facilitate the processing of a heavy load of incoming calls. The HDSS console connects only to designated electronic telephone circuits, and is associated with electronic telephones.

HESB

External Speaker Box -- A speaker/amplifier that can be configured with the system to provide a variety of functions. such as a paging speaker and/or Background Music (BGM) Speaker.

HHEU

Headset/Loud Ringing Bell Interface -- Subassembly that fits inside a digital telephone or a 6500-series electric telephone to allow a headset or an external speaker box (BGM) speaker.
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ISDN

Integrated Services Digital Network. ISDN service requires service subscription from a Telco with ISDN equipment. It allows digital information to be exchanged directly at each end of the line, without the need to convert analog to digital signals. Connection speeds are faster and audio quality is superior.

LATA

Local Access and Transport Area.

LCD

Liquid Crystal Display -- The optional display on digital and electronic telephones that displays calling information.

LCR

Least Cost Routing.

LSI

Large Scale Integration -- Related to circuit design technology. Strata DK system printed circuit boards (PCBs) use LSI circuit design.

MDF

Main Distribution Frame -- The wiring frame usually located in a phone closet.

MDFB

Door Phone Box -- A peripheral two-way speaker box option.

MOH

Music-on-Hold -- Customer-supplied music or announcements can be sent to parties on-hold on CO lines or the intercom.

NFAS

Non-facility Associated Signaling -- provides the ability to create ISDN trunk groups beyond the 23 channels available with a single Primary Rate Interface.
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NT-1

Used in ISDN. Network Termination device that powers a U-interface ISDN line and enables multiple S/T ISDN devices to connect to it. The NT-1 must be UL-listed (US) or CSA-certified (Canada).

OCA

Off-hook Call Announce. There are two types: Handset OCA and Speaker OCA.

PBX

Private Branch Exchange -- Industry-standard term which refers to a telephone switch, usually on-premises, which serves an individual company, and is connected to a public telephone exchange through the Central Office (CO).

PCB

Printed Circuit Board.

[PDN]

Primary Directory Number.

PF

Power Failure.

[PhDN]

Phantom Directory Number.

PRI

Primary Rate Interface -- A trunk interface to the ISDN network, which enables multiple use of channels for DID, Tie, FX, WATS, 800, etc. It supports multiple services and dynamic channel allocation. PRI is the larger ISDN interface (via the RPTU) with 23B+D transmission format. Channels are 64-lbps. Also see BRI.
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PSAP

Public Safety Answering Point -- Used for E911 calls.

RAM

Random Access Memory -- Refers to the type of system memory that holds individual system configuration and feature programming. RAM is read/write memory, and can be easily revised in programming.

ROM

Read Only Memory -- Refers to the type of system memory that holds static software that comprises the mechanics of the features' function. ROM is only revised by Toshiba software engineers.

[SDN]

Secondary Directory Number.

SF

Super Frame.

SLT

Single Line Telephone.

SMDI

Simplified Message Desk Interface -- RS-232 link from PIOU, PIOUS, RSSU, RSIS, or RSIU modular jack connected to a voice mail machine to provide Strata DK voice mail integration.
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SMDR

Station Message Detail Reporting.

SMIS

Software Management Information System (SMIS).

S/T Interface

Reference interface points ("S" or "T") of an ISDN network. S/T interfaces are RJ-45, 8-wire connection interfaces for ISDN equipment. An NT-1 is needed to network U-type BRI lines to S/T type interfaces.

TAPI

Telephone Application Programming Interface.

TA

Terminal Adapter or ISDN modem that converts PC and other types of protocol into a signal that works with ISDN. Generally, TAs support RJ-11 voice ports and RS-232C or V.35 or V.449 data interfaces.

TE

Terminal Equipment. This refers to devices using ISDN service (telephones, faxes, computers, etc.) TE1 supports ISDN formats with S/T or U-type interfaces.

TSPI

Telephony Service Provider Interface.

U Interface

A single twisted pair of copper wire on an RJ-11 jack. The wiring is identical to POTS, with different signaling. Only one U-interface device can be attached per line.
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