Thread: Dr. Ari Jaaksi on Maemo 5
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allnameswereout is offline allnameswereout
2008-09-20 , 21:06
Posts: 3,397 | Thanked: 1,212 times | Joined on Jul 2008 @ Netherlands
#284
Originally Posted by Jerome View Post
You don't understand.
Indeed, I don't know the exact bandwidth a 3G mast is able to deliver.

If the cell is only serving you, your figures are correct. In real usage, and more so if everybody tries to use voip, umts (or hsdpa, which really is umts with a better modem) degrades. You won't get that upload.
Then you don't get what you're paying for, and you can sue the 3G provider for that. If they advertise with 384 kbit upload, and you don't get 1/6 of that, its serious trouble. It is of no concern whether you're using VoIP or web browsing. They all cost quite some data.

The solution is simple: as demand increases you place more masts.

What is so difficult to understand? Radio is simple: you have one medium and it has a maximum capacity. Whatever tricks you use, when the capacity is exhausted, that's it.
Thats true with any medium. A DSLAM has the very same issues.

I am not comparing codecs, I am explaining the fundamental problem telcos have with sip over air.
No, it hurts their core business, and they don't wish to adapt. That is their fundamental problem with SIP. Else, they'd instead place more severe limits on data usage and max throughput. As you asserted, they don't do this; they put in contract its illegal to use VoIP.

The system is not financially tenable in the second case, especially if these users chose wasteful codecs (out of ignorance usually).
Then you raise the price, and if your competitors don't, your customers go to your competitors. Last time I checked, the telcos were pretty damn profitable.

You don't have that problem with wires, because it is not a shared medium.
Yes, it is. Its called overbooking. A decent ISP states how high the overbooking is, and guarantees a minimum speed (usually far under the maximum speed though). Coincidentally, this is why business DSL is more expensive: the customer gets a guaranteed better overbooking (e.g. 1:10 instead of 1:25) at the DSLAM, and they get a SLA (although with my consumer line for every day my ADSL is down, I don't have to pay). With cable, its approx the same story, and some cable networks even have token ring. This is also why consumer grade (A)DSL is cheaper than T1/E1 because with those you have 1:1 overbooking.
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