Well, actually, no, I just didn't put full thoughts
and a complete into words; I thought I had
covered myself rather lawyerly by using this
terminology " networks such as ".
Another name that comes into mind: ARDIS
A service that used SMR (not cellular, not
NBPCS) frequencies.
And Skytel. An NBPCS carrier ...
Jim P / WB5WPA /
----- Original Message -----
From: "Mike Clarson" <mclarson@rcc.com>
To: "'Jim P'" <jvpoll@dallas.net>; <rfi@contesting.com>
Sent: Tuesday, March 22, 2005 10:19 AM
Subject: RE: [RFI] Blackberry interference with conference room audio
systems
> Jim: You forgot the network where RIM placed their first Blackberries--the
> RAM Mobile Data Network (on air since 1989) using the Mobitex format. This
> later was renamed BellSouth then Cingular and has since been sold again.
> Don't know the new name.--Mike, WV2ZOW
>
> -----Original Message-----
> From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com]On
> Behalf Of Jim P
> Sent: Monday, March 21, 2005 10:34 PM
> To: Michael Germino; rfi@contesting.com; Leigh L Klotz, Jr.
> Subject: Re: [RFI] Blackberry interference with conference room audio
> systems
>
>
> Leigh, I just want to be clear on this, as all people
> may not have followed the 'evolution' and renaming
> that GSM has gone through into it's current
> manifestation - GPRS.
>
> All this 'renaming' hasn't materially changed the
> air-interface level of the underlying principle upon
> which GPRS (General Packet Radio Service) is
> based, and to a lesser extent, the next migratory
> step, EDGE (Enhanced Data for Global Evolution).
>
> These are based on _the same_ air-interface frame
> structure, logic channel and 200kHz carrier bandwidth
> and symbol rates as GSM (# bits/symbol changes in
> EDGE for higher data rates, as does the modulation
> format).
>
> It's not until the last step towards "3G" cellular/data,
> called (variously) UMTS and IMT-2000, that a major
> change is made,and W-CDMA (Wide-CDMA) is used
> for the air-interface (RF link).
>
> Evolution of GSM to 3G/IMT-2000 via GPRS/ EDGE/ WCDMA
> http://www.geekzone.co.nz/content.asp?contentid=2362
>
> There are other 2-way wireless data networks out there
> too, that actually predate today's GSM/GPRS/EDGE
> networks; they were not as widely publicized as the big
> cellular carriers have done in promoting their offerings ...
>
> The original Blackberies, by RIM (Research In Motion)
> actually used these other networks early on (and may
> still yet to this day); networks such as Pagenet's ReFlex
> R50 protocol, and PageMart's ReFlex R25 network - both
> operating nationwide (originally designed for 2-way paging/
> messaging, but adopted for PDAs as that fad -er-
> technology matured).
> .
> Jim P / WB5WPA /
>
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|