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ATM vs STM | Difference between ATM and STM


Refer Following links to subtopics on this ATM tutorial:
ATM Network Architecture & Interfaces   ATM Protocol Stack  ATM services  ATM Switch  ATM Call Flow  ATM vs STM  ATM vs TDM  ATM versus Frame Relay  ATM AAL Layer Types 


This page compares ATM (Asynchronous Transfer Mode) vs STM (Synchronous Transfer Mode) and mention difference between ATM and STM.

ATM-Asynchronous Transfer Mode

ATM operation

• The figure-1 depicts operations performed by ATM protocol stack.

• Here upper layer data is divided into packets of size equal to 48 bytes.

• After the packetization is done, header is added to all the packets.

• This packet along with header is referred as ATM cell.

• This technique is referred as Statistical Multiplexing.

• In ATM network, packets are transmitted only when there is data to be sent. Hence it is better than STM, as there is no bandwidth used when source is idle.

• As header adds overhead to the packet, it adds delay for the packet to be transported through ATM Switch or ATM network.

STM-Synchronous Transfer Mode

ATM vs STM-Difference between ATM and STM

• The figure-2 mentions ATM and STM packetization.

• As shown STM is similar to Time Division Multiplexing.

• No header is incorporated in this technique.

• In STM (Synchronous Transfer Mode), each source has been assigned bandwidth dedicatedly.

• All the sources get periodic turn for transmission.

• As there is no header incorporated to the packets, there is no overhead and hence STM incorporates fixed delays.

• STM is not suitable for bursty source of traffic.

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