multiplexing

Group MemberShafqat ullah (2k11-coe-08)

YouSuf Nazir(2011-coe-17)JamShaid ali(2011-coe-10)

Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.

Multiplexing (also called muxing ) is a method by which multiple analog message signals or digital data streams are combined into one signal

Example:In telecommunications, several telephone call may be

carried using one wire.

A Multiplexer (MUX) is a device that combines several signals into a single signal.

A Demultiplexer (DEMUX) is a device that performs the inverse operation.

Multiple low data rate signals are multiplexed over a single high data rate link, then de-multiplexed at the other end.

Space-division multiplexing (SDM)Frequency-division multiplexing (FDM)Time-division multiplexing(TDM)Code division multiplexing (CDM)Wave Division Multiplexing

Categories of Multiplexing

Time-division multiplexing (TDM) is a digital process that can be applied when the data rate capacity of the transmission medium is greater than the data rate required by the sending and receiving devices.

TDM

TDM is a digital multiplexing technique to combine data.

TDM can be implemented in two ways: synchronous TDM and asynchronous TDM.

In synchronous time-division multiplexing, the term synchronous means that the multiplexer allocates exactly the same time slot to each device at all times.

TDM frames

Figure 6.21 Multiplexing and inverse multiplexing