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Dial back

The procedure for identifying and authenticating a remote information-systems (IS) terminal, where the host system disconnects the terminal and re-establishes contact.


A one-way communication from a base station (such as a hospital switchboard) to a mobile device (such as a cell phone) or fixed receivers (such as an intercom system).

Password protection

A protected and private string of numeric and alphabetic characters used to authenticate an identity or to authorize access to data, a network, or a device.

Plug and play

The ability of certain operating systems to automatically (a) detect a new device that has been added to the system, (b) uniquely identify that device, and (c) install the appropriate drivers and system files for that device.

Printer Server

A device that connects printers to client computers over a network. It accepts print jobs from the computers and sends the jobs to the appropriate printers.


A unit used to connect two or more networks or devices, usually wirelessly.

Routing directory

A matrix associated with a network control protocol, which gives the hierarchy of link routing at each node.


A device that provides service to the users of a shared network by managing shared resources.

Speed dialing

A function available on many telephone systems allowing the user to place a call by pressing a reduced number of keys.


A proprietary voice-over-IP service and software application that allows users to communicate with peers by voice using a microphone, video using a webcam, and instant messaging over the Internet.

Skype phone

A telephone that uses the Skype service to place calls over the Internet, rather than a traditional landline.


A telephone with a loudspeaker and microphone, allowing it to be used without picking up the handset.

Telephone line

The wire that carries telegraph and telephone signals, allowing people to place phone calls.

Telephone extension

An additional telephone set that is connected to the same telephone line.

Telecommunications service

Any service provided by a company that specializes in the telephone or similar industries.

Telecommunications system

A collection of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment that interconnect to form an integrated whole.