AT&T AT&T Data Module, Data Terminal Equipment DTE, Delay-Dial Tie Trunk, Digital Data Endpoints

Data Module

A data interface device (i.e., Asynchronous Data Unit) providing a standard interface between customer provided data equipment and a data port on the switch.

Data Terminal Equipment (DTE)
DTE refers to a specific RS-232C	connector	termination designed	to connect directly
to a DCE type connection. Typically associated with video display terminals,
printers, and computers which either originate or terminate a			data transmission
path.
Refers to RS-232C compatible Data	Terminal	Equipment

Delay-Dial Tie Trunk

After a request for service (called a seizure) is detected on an incoming trunk, the system sends a momentary signal followed by a steady tone over the trunk. This informs the calling party that dialing can start. This type of trunk allows dialing directly into the system. That is, the digits are received as they are dialed.

Digital Data Endpoints

In System 25, digital data endpoints include any digital device providing a RS-232C connection interface to the switch. The connection is via Asynchronous Data Units (ADUs) to the switch.

Direct Extension Selector (DXS) Console

An option at the attendant console that allows an attendant direct access to voice terminals by pressing a Group Select button and a DXS button.

EIA: (Electronics Industries Association)

Emergency Transfer Unit

Provides direct connection of designated Power Failure Transfer (PFT) registered voice terminals to the CO during a power failure or other service interruption.

Erlang

A traffic measuring unit that expresses the load of one or more traffic-handling devices [36 CCS equals 1 erlang - see CCS (Hundred Call Seconds)].

Extension Number
One- through four-digit number			assigned	to	each	voice	terminal	and data	end point
in the system. Also see “ Personal Dial Code”
External	Call
A	connection between a system		user and	a	party	on the	public	telephone	network or
on	a tie	trunk.
FRL: (Facility		Restriction Level)

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