CDPD
Hi Jozef
The problem is that there are very few devices that can use CDPD. If you had pdQ like device with CDPD when CDPD started, it would have been popular. Those AT&T phones with like 3 lines by 12 characters are very limited. I don't know how programmable they are.
The AT&T 'phones suffer in comparison with what is available today. Shows you how quickly the technology moves on. They were state of the art back in '94. They are not programmable per se, but you can set up your Unwired Planet browser and 'phone book via the keypad.
Also, CDPD (at least in my eyes) is a sinking ship. The handsets are analog, where air time is more expensive, even though the data is cheap. And you know it will be dumped sooner than later.
There is no reason why AMPS need to continue to be expensive. The network infrastructure has been paid for. Look for price cuts as digital rolls out. You already see a two tier approach to cellular marketing - AMPS 'phones are given away, digital 'phones cost you a $100 or more... I don't see AMPS going away for several years, if ever. We still have Plain Old (wired) Telephones.
I don't understand all the rush to high bandwidth. As I mentioned here earlier, 14.4K packet data is all you need for 95% of wireless data apps running on pdQ like devices.
Neither do I. The only possible rationale is "if they build it, they will come". However, we are a few years away form the convergence of 'phone and computer that would justify the high bandwidth services. I know PDq's are here now, but the network infrastructure support for high bandwidth data services isn't, and won't be for a long time.
I thought TCP/IP provides some sort of error checking, while UDP does not (but my knwledge of networking is limited) BTW, what is SMS?
You are right. However, lower layers in the protocol stack also provide error detection and correction, so for embedded applications (like Unwired Planet - applications that run on your 'phone/PDq) TCP isn't needed.
SMS is Short Message Services.
regards
w. |
