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  • mmaronati,

    There is anbother article in this URL, VoIP-PSTN.pdf. If you read this you will get an answer to your query against bullet point 9.

    Re convergence, at the transport level everything voice, data, video are converged as they all travel along the same synchronous links - TDM, STM, WDM and DWDM. Convergence at the access level may be done either through all IP using VoIP and IP data, or through mixed network using CS voice / fax (PSTN) and IP for data as is done through the ADSL system for wireline and 3G for wireless. The bandwidth requirement is higher for VoIP. While this is easily attainable in wireline system although at higher cost, when you try to do this on wireless as in 4G and LTE, you put a stress on Radio spectrum. More bandwidth needs more spectrum which is in short supply, not stretchable, and guided by the laws of Physics, The 3G mixed network is perfectly workable and uses CS voice and IP data. 4G aims to get higher data speed (although the need projected in my view is frivolous). This can be achieved by increasing the IP bandwidth of 3G, leaving the voice on CS. Converting into all IP is an unnecessary additional stress on Radio spectrum., in my view.
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  • Pankaj!! good job ! pretty serious analyzes of an old style mind which reminded me the greatest craftsmen from italy! .. and 'mitra' in italian means 'machine gun'!! and you went like a machine gun!

    I am a telecom consultant but more on the economic/financial planning than technical side as you master with extreme experience. So pardon me if I may run into mumbling not precise considerations.
    From a quick read (and I will read it again as it is a mini encyclopedia of Telecom public structure) I am guessing that you are more in a supporting prospective for the existence of both public organization of telecom: PSTN & VOIP. First of all because it is almost impossible in a relative brief time to substitute PSTN and it can be dangerous as at the moment VOIP may present still some lacking integration.
    Of course we have to keep present in our mind that history shows also that the more human brain focus on something and the better output will follow the moulding the final outcome. So all the negativity may not be there in the next future, as I think also PSTN at the beginning was not perfect as at this time. But you are justly saying why to put so much energy in something that it is not perfect!

    About the Convergence you pressed a negative analyzes focusing on something very specific: the IPTV quality lacks but kind of forgetting some other positivities (I am not an expert to list them at the core level but at the premise level for example that somebody can bring home his ip-phone and looking like he is working from the office, it sounds pretty solid).

    I may comment more when I will read it again, as I validate your researches a lot.
    But one important question it interested me was when, at the Bullet Point #9, you established that VOIP can take 5 times bandwidth then PSTN voice.
    Can you please elaborate the motifs and tech reasons behind that affirmation?

    god bless you

    (PS: I totally agree with you that humanity now should focus on alternative energy, especially for a balance of democracy and freedom, besides avoiding stripping the world heart)
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