[IP] more on 3G, American Style
Begin forwarded message:
From: vijay gill <vgill@xxxxxxxxxxxxx>
Date: September 22, 2004 6:01:00 PM EDT
To: David Farber <dave@xxxxxxxxxx>
Cc: Ip <ip@xxxxxxxxxxxxxx>
Subject: Re: [IP] 3G, American Style
Allow me to make a few corrections.
On Wed, Sep 22, 2004 at 02:28:08PM -0400, David Farber wrote:
By Eric S. Brown
September 22, 2004
<http://www.technologyreview.com/articles/04/09/wo_brown092204.asp?
trk=nl>
barrier, the new 3G sofferings are recognizably broadband. AT&T's
service
promises 220- to 320-kilobit-per-second Web access, with burst rates
of up
to 384 kilobits per second. The service is surprisingly inexpensive
at $25
a month, but it’s available only over $300 3G phones such as the
Motorola A845 or Nokia 6651 or on laptops equipped with a $150 add-in
card. Verizon's pricier service ($80 per month) offers 300 to 500
This is incorrect. The service for the $150 add-in cards costs $80, same
as verizons. The $25/mo plan is only available on the handset. If you
tether the handset or put the SIM into a data card, you will be charged
extra.
UMTS was meant to blend GSM (Global System for Mobile Communications),
the cellular standard that represents about 70 percent of the world’s
cell phone users, with CDMA (code division multiple access), which
claims about 20 percent of users, mainly in the Americas. Yet two other
UMTS uses techniques commercialized by qualcomm, specifically CDMA. It
did not blend either the back end or the air interface between GSM and
the CDMA as used in the US (is95, 1x et al).
UMTS might more properly be called wideband CDMA.
related, but incompatible variations of CDMA have also survived: the
CDMA-2000/Evolution Data Optimized (EV-DO) service being pushed by
Verizon and Sprint in the United States, and the Wideband-CDMA based
closer to commercial use. Flash-OFDM is a spread spectrum technology
developed by Flarion Technologies that uses a scheme called orthogonal
frequency division multiplexing to improve performance by continually
seeking out the cleanest possible transmission frequencies, allowing
multiple signals to travel over a single path without interfering with
OFDM is used in most peoples new notebooks - .11g utilizes OFDM. OFDM is
not exclusive to Flarion.
/vijay
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