scroll to top
Stuck on your essay?
Get ideas from this essay and see how your work stacks up
Word Count: 2,027
The Asynchronous Transfer Mode has been chosen as the standard system concept for integrated broadband communication networks by the ITUT The system is predicted to grow rapidly as soon as it becomes widely accepted by network operators and users Why has communications evolved in history towards the ATM concept and why has it been chosen as the broadband solution In the late 1800s public telephone networks capable of transmitting analogue voice signals were established The users were connected together via switches across the network to form a circuit This was the first transfer mode used in telephone networks and it is known as circuit switching The invention of the vacuum tube led to the introduction of frequency division multiplexing FDM in 1925 and therefore the ability to make multiple connections on a single line The public switched telephone networks PSTNs expanded but with the circuit switched transfer mode remaining in use This is because it provided an obvious way of keeping the constant connection necessary for voice traffic The invention of the transistor and the concept of pulse code modulation PCM allowed digital communications to be developed in the late 1960s The interconnection of computer systems over telecommunication networks soon became a requirement Modems were used at first to generate analogue signals compatible with the PSTNs from the digital computer data to allow such interconnections The already wide spread use of the PSTNs was an advantage of this scheme however it was soon recognized as not being an optimum solution for data transfer The analogue PSTNs were unsuitable in terms of switching capacity bandwidth and channel noise In data communication applications data tends to be transferred in bursts separated by silence The constant connection provided by circuit switching therefore does not provide optimum usage of the network resources The PSTNs were ordinally dimensioned to provide capacity to transport voice signals which provides very limited bandwidth and therefore a low maximum
@Kibin is a lifesaver for my essay right now!!
- Sandra Slivka, student @ UC Berkeley
Wow, this is the best essay help I've ever received!
- Camvu Pham, student @ U of M
If I'd known about @Kibin in college, I would have gotten much more sleep
- Jen Soust, alumni @ UCLA