Time-division multiplexing, or TDM, is a multiplexing method for transmitting multiple data streams in a single communication path.
In time-division multiplexing TDM , the data from different input channels is divided into fixed-length segments and then combined in round-robin fashion into a single output data stream, which can then be transmitted over a single channel transmission system and demultiplexed at the destination location.
L-55 Time Division Multiplexing TDM, TDM/PAM in Digital Communication by Engineering Funda
The segments can be created by the multiplexer itself or can be inherent in the input channel signals, such as fixed-length frames. For example, if input streams A, B, and C are divided into segments as shown here:. One weakness in this mechanism is that if an input channel does not have anything important to carry for a time, empty segments are inserted into the output stream anyway.
For example, if channel A is not transmitting data, one-third of the output channel is not being used. You can overcome this weakness by using a more sophisticated multiplexing technique called statistical multiplexing.
TDM is used in T1 lines to enable them to simultaneously carry 24 data channels by interleaving data into portions of a single bit frame.
For example, bits 1 through 8 represent channel 1, bits 9 through 16 represent channel 2, and so on to bits through for channel 24, plus bit for synchronization.
This framing process occurs times per second, producing a total throughput of 1. Local Security Database is the database of user and group accounts on a server or workstation running Microsoft Windows NT installed as part of a workgroup.
In the workgroup security model, each A Workgroup in Windows Networks is a logical grouping of networked computers that can share resources with each other. These resources might include files, printers, and other devices.
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