Also found in: Dictionary, Thesaurus, Medical, Financial.
telephone modem[′tel·ə‚fōn ′mō‚dem]
A piece of equipment that modulates and demodulates one or more separate telephone circuits, each containing one or more telephone channels; it may include multiplexing and demultiplexing circuits, individual amplifiers, and carrier-frequency sources.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
analog telephone adapterA device that adapts a subscriber's analog telephones to a digital voice service from a VoIP, cable or DSL provider. Connecting to the modem, router or directly to the cable coming into the premises, the analog telephone adapter (ATA) delivers dial-tone, manages the call setup and provides the conversion between digital and analog voice. See IP phone and VoIP.
|With this adapter, an analog telephone is connected to either a router (LAN) or the Internet (WAN) for VoIP service. For telco company (PSTN) backup, it includes an FXO port. See SIP and FXS. (Image courtesy of Grandstream Networks, Inc., www.grandstream.com)|
|In this earlier Comcast cable example, the coax line was split between the ATA and cable modem. The ATA was wired to an analog telephone for voice, and the cable modem connected to the router for data. Newer Comcast gateways include the cable modem, ATA and wireless router in one device. See cable/DSL gateway.|
|Direct to Internet|
|Connected to the Internet via Ethernet to the local network, this ATA converts IP packets into analog voice (and vice versa) for the cordless base station. All other phones in this home are IP phones that also connect to the Internet. The ATA allows older equipment to co-exist with a new VoIP phone system. See VoIP.|
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.