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 ?
Time Multiplexing. Nowadays, FPGAs can operate at clock speeds of hundreds of MHz.
Parallel Time Multiplexing. This proposed strategy is an extension of the previous one.
For instance, a dynamic angular resolution should be only combined with the time multiplexing of the orientations when [F.sub.P] is higher than [F.sub.S].
The main improvement is obtained after time multiplexing the computation of the power per orientations.
Caption: FIGURE 12: Clock regions for the time multiplexing of the computation of multiple N0.
Figure 2 shows a typical RF front-end circuit for an AEA transmit/receive (T/R) module that uses time multiplexing (gating) for achieving transmit/receive isolation.
Figure 3 shows a general time multiplexing format for sharing simultaneous radar, ESM and ECM operations in a multifunction system along with some key loss issues when time sharing pulse Doppler radar functions.
Some of the more important EMC factors that result from a multifunction system time multiplexing scheme are: * The duty cycle of pulse Doppler (PD) radar must be reduced when being time shared with other transmit functions such as ECM and communications.
Within each channel, time multiplexing is required.