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> Linux GPRS and GSM data on
Linux GPRS and GSM data on 2011-11-22
GPRS is
a
data transmission
via GSM
for
packet
data
service is
a superior
digital cellular
standard
.
Although
GSM
is a
circuit-switched
data on
the
occupation of
a
channel
and
in any case
,
but
the data
is always
on
GPRS
connection
(always-on),
packet switching
(packet-switched)
data stream
,
users
pay
according to
use
.
Transmission speed
of GSM
is generally
9.6 kbps,
while
GPRS can
run
at a rate of
56 kbps to
170 kbps.
GPRS
and GSM
chips
usually have
a
UART interface
to the system
.
For the
built-in
GSM / GPRS support
of
motherboard
(
for example
,
with a
connection
to the UART
channel
Siemen MC-45
module
motherboard
)
, the traditional
serial driver
can
drive
this
link.
Consider the
PCMCIA / CF
form factor
(
such as
an
optional
GPRS
card
), serial_cs (
PCMCIA serial
devices
for accessing
the common
card
service
driver)
to
allow
other operating systems
to
this
card
as
a serial device.
The first
unused serial
device
(/ dev / ttySx)
is
assigned to this
card
,
this card
can
then
be treated as
a serial
device access
.
serial_cs
can also
Global Positioning System
(GPS) PCMCIA
and CF
cards
emulate serial
port
.
For
USB GPRS
modem
is concerned
, USB-to-serial
converter
USB port
into a
general
virtual
serial
port
, so the
rest of the system
will
see it as
a serial
device.
GPRS network
using the
GGSN (GPRS
Gateway
Support Node
) is connected to
an external
network (
eg
Internet).
GPRS device
with
extended AT
command set
is similar to
the
modem
,
before
entering the
data
must use the
AT command
mode
to define a
context.
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