Newsgroups: sci.electronics.misc
Subject: Re: PIN Description of NOKIA 3110
References: <[email protected]> <[email protected]>
"Jerry G."  writes:
 
> I don't know the pinouts, 

The pinouts are listed in http://www.mobileworld.org/ like 
lots of technical information from many other mobile phones that
the manufacturers did not want to give publically available.
The 3110 information is at
http://www.mobileworld.org/tech_info/gsm/nokia.htm#NOKIA 3110

> but I believe you will need a cellier modem
> to interface to the phone itself.  

You don't need a modem to interface to that phone. There are
already serial control bus pins available in the back of mobile
phones. With suitable software and cable that mobile phone
can transfer the data through radio waves in GSM data format.
In GSM system there is no need for any modem, because in GSM data
the data is transmitted as data (same way as the digitized and compressed
normal speech audio in GSM) to the GSM exchange, which can then route it to
to some data network or modem pool. 

> It is actualy a 2 way duplex radio,
> and there are some complex criteria that must be worked out to
> interface it.

GSM phone is not just a 2 way radio. It has much more functions
than just simple 2 way radio. GSM phone includes 2 way radio capable
of transmitting and receiving digital data at varying conditions,
signal processing for speec encoding and decording, lots of control
software inside etc.

> I use a cell phone phone with computers at times.  I have a cellier
> modem that plugs into the base of the phone, and then connects to the
> serial port on the computer.  It simulates a dial tone as if your were
> actualy on a phone line...

Many new GSM phones on the market (newer than 3110) have even more advanced
data functions built it. The connector on the back of the telephone
has direct RS-232 pins on it's connector. The phone looks like
a normal modem connected to the serial port of the computer.
And it is possible to make a data call just like it were
a normal modem (just send ATD command and telephone number and here you go..).

-- 
Tomi Engdahl (http://www.iki.fi/then/
Take a look at my electronics web pages at http://www.hut.fi/Misc/Electronics/