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HSL over TDM / ATM

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  • #52125

    Dear friends

    I am looking for the difference between HSL over TDM and HSL over ATM: the principles, standards and dimensiontion guide. Can anybody help me? many thanks!!


    Hi Tuannd,

    As I know that the HSL is over ATM, but its can be over TDM but its will be as simulation and its will be 30 % use of the 2 Mbps.
    Also in TDM you can use the total bandwidth or the total E1 but fractional 30 channels .


    I want to know difference between TDM HSL and ATM HSL


    Can anybody describe a little what is the difference between ATM and TDM?

    galal Ajlouni

    Would you please help me to get the formula how to calculate link load (in erlangs) for ATM-HSL (High speed link) .


    Want to know ATM HSL Bandwidth

    Wallis Dudhnath

    ATM and TDM are two types of data transfer technologies. TDM stands for Time-division multiplexing, which is a method of combining multiple data streams into one and sending it together over one signal. ATM stands for Asynchronous Transfer Mode. It is based on a fixed “cell” that is used to convey a Multimedia payload, i.e. Voice, Data, etc..

    Summary: ATM uses “cells” whereas TDM uses a “nailed up” TimeSlot to convey information. Internally, HSL uses ATM “cells”.

    Over 20 years ago when TDM was overloaded with the signalling load there was the move to 2Mbits/s HSL. This was an interim step before the full adoption of Sigtran (SS7overIP).

Viewing 7 posts - 1 through 7 (of 7 total)
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