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Time DivisionMultiplexing

Synchronous Asynchronous

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Synchronous TDMSeparate time slot for each device…..

…whether or not the device has anything to transmit.

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 Asynchronous TDM

The frame contains a fixed number of slots. The slotsare however not dedicated to fixed devices.

Number of slots is not necessarily the same as number

of input devices.

More than one slot in a frame may be allocated to aninput device.

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Consider multiplexing scheme in T1 line.

… an example of Synchronous TDM.

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 Added Channel Framing

Ex.: E1 Standard

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