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reaching police and emergency, taxi, delivery or
automated services (vending machines,
supervision, vehicle tracking). Horizontal
applications are more generic and include those for
Internet access, e-mail, messaging, e-commerce
and entertainment.
GPRS is able to take advantage of the global
coverage of existing GSM networks. Applications
developed for GPRS can be deployed on a large
9,600/14,400
9,600/14,400
9,600/14,400
9,050/13,400/
15,600/21,400
9,050/13,400/
15,600/21,400
9,050/13,400/
15,600/21,400
9,050/13,400/
15,600/21,400
A comparison between GSM and GPRS
1. A normal GSM call uses only one of eight
repeating time slots in the GSM channel, giving a
data speed of 9,600 bps. The T310/T312 sup-
ports a more efficient coding scheme, giving data
speeds of up to 14,400 bps (with necessary net-
work support). Furthermore, High Speed Circuit
Switched Data (HSCSD) adds the possibility of
using two time slots for receiving data, increasing
the data speed to as much as 28,800 bps (net-
work dependent).
scale and can reap the associated benefits. GPRS
also provides a secure way to connect to private
networks, banking and financial services.
With GPRS, the T310/T312 sends data in
"packets" at a very high speed. The T310/T312
uses transmission capacity only when data is sent
or received. For details, see "GPRS technical data"
on page 66.
GSM
9,600 bps
1
14,400, 19,200 or 28,800 bps (HSCSD)
2
GPRS
9,050, 13,400,
15,600, 18,100,
21,400, 26,800,
27,150, 31,200
40,200, 42,800,
46,800 or 64,200 bps
2. In GPRS, data is sent in packets, with up to
three time slots being combined to provide the
necessary bandwidth. The T310/T312 is pre-
pared to support 3+1 time slots, giving speeds of
up to 40,200 bps for receiving data, depending
on coding scheme.
22
T310/T312
White Paper
January 2003
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