On Tue, 25 Oct 2005 23:56:51 GMT, John Navas
<spamfilter0@navasgroup.com> wrote:

>[POSTED TO alt.cellular.gsm - REPLY ON USENET PLEASE]
>
>In <rtgtl1ledgguen6o1mo5ej4qtqfpo7616a@4ax.com> on Tue, 25 Oct 2005 16:54:01
>-0700, matt weber <mattheww50@cox.net> wrote:
>
>>On Tue, 25 Oct 2005 09:25:11 -0700, Jeff Liebermann
>><jeffl@comix.santa-cruz.ca.us> wrote:
>
>>> All of the handsets have automatic power control to limit the
>>>tx power to only as much as necessary. The tiny new phones barely
>>>transmit at more than 0.1 watt.
>>
>>Wrong yet again, AMPS/D-AMPS phones have no power control loop.
>>IS-136, GSM, and CDMA do have a power control loop.
>
>D-AMPS == IS-136.

WRONG AGAIN. D-AMPS is actually IS-54, and is fully compatible with
AMPS systems in ALL respects. That means all control signaling, call
set up, dialing, all control information is transmitted by FSK, which
places a VERY LOW LIMIT on signaling rates. So low that there was
point in providing any signaling capability outside what was required
to make and receive calls.

IS-136 is a variant of D-AMPS which incorporates a number of
extension and changes relative to IS-54, and is NOT backward
compatible with AMPS, or IS-54 because IS-135 depends upon digital
signaling, sent by QPSK in the Digital Control Channel (DCCH), which
does NOT exist in IS-54.

D-AMPS as defined in IS-54 has NO support for data communications at
all, NONE, ZERO, NIL. That means : NO SMS, NO Circuit Switched Data
(CSD), NO-Caller-ID, NO sleep mode, No power control loop, No paging,
No Voice mail indicator, no e-mail capability, because there is NO
facility for any sort of data tranmission within IS-54.


I don't think you can even get a license to operate an IS-54 system in
the PCS band...