Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Qualcomm Moderated Thread - please read rules before posting -- Ignore unavailable to you. Want to Upgrade?

To: propitious7 who wrote (28823)	11/12/2002 11:18:29 PM
From: Eric L	Respond to of 197031

<< But (in U.S.) isn't analog in the 400mhz spectrum while CDMA is either in 800 mhz of 1900 mhz.>> No. Analog AMPS is 800 MHz throughout the Americas. - Eric -

To: propitious7 who wrote (28823)	11/13/2002 2:32:23 AM
From: engineer	Read Replies (1) \| Respond to of 197031

nope, you got it wrong. A carrier in the 800 Mhz band has 12.5 Mhz in which they can mix what they want. The analog channels are 210 khz wide, so for 1.2288 Mhz, you need to get rid of 5 analog channels. GSM has just about the same channelization, so hence they can do the same. AT&T has to do the same thing in ther stuff, whichg is to have the A band be a couple of peices split up. It is like 10 MHz and a 2.5 Mhz peice split apart. So if they put in GSM in their freq spectrum, then they are doing it just like the analog guys are or the CDMa guys are.

To: propitious7 who wrote (28823)	11/13/2002 10:22:29 AM
From: RalphCramden	Read Replies (1) \| Respond to of 197031

CDMA in North America shows up at 800 MHz and at 1900 MHz. 800 MHz is often called "Cellular" (even though all of these systems are "cellular") while 1900 MHz is referred to as "PCS" for Personal Communication System (even though all these systems are "pcs"). The first CDMA in North America was, as engineer described, an "overlay" of the analog (AMPS) system. CDMA did and still does coexist in the "Cellular" 800 MHz band. They coexist by living next to each other, as engineer describes when you want to put up a CDMA channel, you clear out all the AMPS channels in the 1.23 MHz of spectrum. Worldwide, CDMA can be found at 400, 800, 900, 1900, 2100 MHz. But that doesn't mean that CDMA couldn't be deployed at another frequency if it was available somewhere in the world. The infrastructure and phones are cheap and easy to redesign for different frequencies. GSM1X could be done either as an overlay, as engineer suggests, within the existing GSM bands (which cover different frequencies in different parts of the world). I believe I have read the suggestion that for Europe GSM1X could be in 450 MHz while regular GSM staid in its current band. The GSM1X phones would be dual-band dual-mode, able to operate BOTH as traditional GSM phones in traditional GSM band AND as GSM1X phones in 450 MHz band. GSM1X enabled systems would recognize this phone as capable of GSM1X and would direct it to that band when it roamed into or registered in their system. When the phone left GSM1X capable systems it would be directed by the system to switch over to regular GSM bands. Or if it lost GSM1X coverage, or was turned out outside GSM1X coverage, it would search for a regular GSM system if it couldn't find a GSM1X system. As a result, the GSM1X phone would be identical to a GSM phone from the point of view of the user. If the user is a data user, it would be identical to a GSM phone PLUS it would be better (faster) at data than a "regular" GSM phone. The key really with CDMA is that it is an efficient air interface. The customer for that is the service provider, who can service more customers with a given amount of spectrum and a given number of base stations. The GOAL of GSM1X would be transparency, there is no reason the customer even needs to know that his phone is not just another GSM phone. To the moon, Ralph