time-division multiplexing

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Related to time-division multiplexing: TDM

time-division multiplexing

[′tīm di¦vizh·ən ‚məl·tə‚pleks·iŋ]
(computer science)
The interleaving of bits or characters in time to compensate for the slowness of input devices as compared to data transmission lines.
A process for transmitting two or more signals over a common path by using successive time intervals for different signals. Also known as time multiplexing. Abbreviated TDM.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


(1) (Target Disk Mode) A method for transferring files between two Macs. See Target Disk Mode.

(2) (Target Display Mode) An iMac feature that enables the screen to function as an external monitor for another computer. See Target Display Mode.

(3) (Time Division Multiplexing) A technology that transmits multiple signals simultaneously over a single transmission path. Each lower-speed signal is time sliced into one high-speed transmission. In the simplest example, three incoming 1,000 bps signals (A, B and C) can be interleaved into one outgoing 3,000 bps signal as ABCABCABCABC. The receiving end divides the single stream back into its original signals.

TDM enabled the telephone companies to migrate from analog to digital on all their long distance trunks, and later to the local loops. TDM is widely used to combine multiple 64 Kbps streams into the 1.544 Mbps capacity of a T1 channel. For example, a channel bank converts 24 analog voice conversations into digital and then multiplexes them via TDM onto the T1. Contrast with FDM. See TDMA, circuit switching, channel bank and DS.

From FDM to TDM to Packet Switching
TDM has replaced FDM (frequency division multiplexing) for telco backbone networks, but packet switching is expected to become the norm for voice and data in the 21st century.

From FDM to TDM to Packet Switching
TDM has replaced FDM (frequency division multiplexing) for telco backbone networks, but packet switching is expected to become the norm for voice and data in the 21st century.
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References in periodicals archive ?
A formal definition of the time-division multiplexing address assignment (TDMAA) mechanism consisted of two parts, an address-loss function and a scheduling approach.
It can handle calls over traditional time-division multiplexing lines or the Internet via AT&T IP toll-free, local, direct inward dialing, and Megacom toll-free, routing them via the AT&T multiprotocol label switching network to the hosted infrastructure.
The HiPath 4000 system is an IP-convergence platform that works with both legacy time-division multiplexing communications infrastructures and more modern IP-based communications solutions.
Additionally, the product can now be deployed to other underlying platforms, such as IP-based infrastructure and IP-PBXs, allowing companies with an existing IP infrastructure already in place to transition to a VoIP solution with all of the queuing, routing and reporting features found in the FirstPoint Enterprise product operating on a time-division multiplexing (TDM) infrastructure.
In the past, in order to listen in or record information about someone else's phone calls, a person would need physical access to the traditional time-division multiplexing circuit-based PBX equipment, the telephone wiring or PBX trunks to the telephone company's central office.
Level 3's comprehensive voice solutions combine service experience in traditional time-division multiplexing with more than 12 years of innovation in voice over Internet protocol technologies.
The Abacus 5000 IP telephony test system is a fully integrated VoIP and PSTN telephony test system in a single platform, with analog, time-division multiplexing and Ethernet interfaces for comprehensive and realistic testing.
MSSR was developed for access and backbone switching requirements of next-generation Tactical Area Networks based on IP technologies, while CAS is a switch, router and media gateway that provides voice and IP data communications using time-division multiplexing (TDM) and packet data architectures.
Unlike the basic time-division multiplexing (TDM)telephone system, VoIP consists of many components, and the possibility of a fault occurring is greater than that of a TDM telephone system, simply due to the increased number of system components.

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