time-division multiplexing

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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.
(communications)
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.

TDM

(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 ?
The proposed CE architecture using time-division multiplexed arithmetic units is shown in Fig.
The multiplier and the divider are time-division multiplexed to calculate the calibration parameters such as the gains and delays.
* The full-service converged carrier uses and/or upgrades the existing building communication infrastructure, and offers both standard Time-Division Multiplexed (TDM) voice services, such as PBX, and data services, such as Internet access and Virtual Private Networking.
Kersey, "Eight element time-division multiplexed fiber grating sensor array with integrated-optic wavelength discriminator," Proceedings of the 2nd European Conference on Smart Structures and Materials, Glasgow, UK, 1994.
Since it contains a separate on-chip Communications Processor Module (CPM), the MSC8101 easily interfaces to Time-Division Multiplexed (TDM) highways, Ethernet, and Asynchronous Transfer mode (ATM) backbones.
It provides next-generation SONET capabilities and serves as an integrated Ethernet over SONET metro access multiplexer that enables service providers to cost-effectively migrate from existing TDM (time-division multiplexed) networks to data-aware packet networks.
MULTIFUNCTION, MULTISERVICE ACCESS PLATFORM features a new FXS interface card that enables voice channels to be connected directly to the unit's time-division multiplexed bus.

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