As the others seem to have agreed since I raised the question, Pro is probably only 448kbps upload. The easiest thing to do is to ask Zen.
Even at 448kbps it isn't necessarily a killer point. It depends how much uploading you do, bearing in mind some of the things you listed may upload as well. Desktop iPlayer used to, I don't know if it still does. The streaming iPlayer doesn't.
As well as that, everything that comes down generates an ACK(nowledgment) requesting the next chunk, or a re-transmit request for any uncorrectable errors.
People doing mammoth film downloads for instance, with hundreds of streams, can find they saturate the upstream with ACKs, so the download has to slow down and things start queuing. If they reduce the number of streams, the upstream can cope, and they get faster downloads.
This isn't quite what you intend to do, but I expect you see the principle. You can fill the upstream and degrade the downstream as a result.
But it's an "If
". It could be fine on 448kbps.
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Edited by RobertoS (Wed 28-Mar-12 17:34:41)