110 lines
4.6 KiB
HTML
110 lines
4.6 KiB
HTML
<html>
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<head>
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<title>osmocom-analog</title>
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</head>
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<body>
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<center><table border='0' cellspacing='0' cellpadding='0' width='816'><tr><td><font face="ARIAL" size='5'>
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<h2><center>B-Netz</center></h2>
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<center><img src="b-netz.jpg"/></center>
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<p align='justify'>
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Before testing this software, power on your B-Netz.
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Refer to the manual how to dial a number.
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Start dialing and after some seconds you should hear a busy signal.
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This means that the phone sweeps over all channels to find a base startion.
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If no free base station is found, you will get a busy signal.
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</p>
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<center><img src="b-netz-display.jpg"/></center>
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<p align='justify'>
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Now run your base station on channel 1.
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Tune the transmitter to 153.010 MHz and the receiver to 148.410.
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You should tune the receiver to 153.010 first, to check if you hear the idle signal from the base station.
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Then tune to actually uplink frequency 148.410 MHz.
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</p>
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<font size='4'><pre>
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# src/bnetz/bnetz -k 1
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...
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bnetz.c:316 info : Entering IDLE state, sending 'Gruppenfreisignal' 2 on channel 1.
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Base station ready, please tune transmitter to 153.010 MHz and receiver to 148.410 MHz.
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To call phone, switch transmitter (using pilot signal) to 153.370 MHz.
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on-hook: ..... (enter 0..9 or d=dial)
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</pre></font>
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<p align='justify'>
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Now dial again on the phone and watch the base station receiving the call:
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</p>
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<font size='4'><pre>
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bnetz.c:471 info : Received signal 'Kanalbelegung' from mobile station, sending signal 'Wahlabruf'.
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bnetz.c:561 info : Received station id from mobile phone: 50993
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bnetz.c:569 info : Received number from mobile phone: 800330100
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bnetz.c:571 info : Sending station id back to phone: 50993.
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bnetz.c:631 info : Dialing complete 50993->0800330100, call established.
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bnetz.c:637 info : Setup call to network.
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call.c:574 info : Incomming call from '50993' to '0800330100'
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bnetz.c:669 notice : Received 'Schlusssignal' from mobile station
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bnetz.c:352 info : Entering IDLE state, sending 'Gruppenfreisignal' 2.
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call.c:695 info : Call has been released with cause=16
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</pre></font>
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<p align='justify'>
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The first thing the phone does is to find the channel 1.
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Then it transmits a signal tone, called 'Kanalbelegung'.
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The base station responds and sends a signal tone, called 'Wahlabruf'.
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Then the phone sends caller ID + number.
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The base station replies the caller ID to prevent false transmissions.
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After establishment, you can use the headset, if present, for speech communication with the phone.
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If you hangup the phone, the call gets released by a message, called 'Schlusssignal'.
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The base station returns to idle.
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</p>
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<p align='justify'>
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In order to call the phone from the base station, you need to transmit channel 19.
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Your transmitter must tune to 153.370 MHz in order to page the phone.
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The phones listens to incomming signals from the base station.
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In order to transmit on channel 19, you may use a second transmitter or re-tune your single transmitter.
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There are many ways todo that, but it is actually up to your own how to couple it and how to control your transmitter.
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I use an optocoupler to tell my transmitter to switch to channel 19.
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</p>
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<center><img src="trigger-1.jpg"/></center>
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<br>
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<center><img src="trigger-2.jpg"/><img src="trigger-3.jpg"/></center>
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<p align='justify'>
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I measure about 3 Volts peak on the ouput of the USB chip I use.
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Since my optocoupler triggers at arround 1 Volts, I have two Volts on the Resistor, which results in 10 mA current.
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In order to check and change the voltage, use '-P positive' or '-P negative' option to select trigger level on one audio channel.
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Run the base station and enter a 5 digit number.
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Measure the voltage on both audio output channels.
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Once you press 'd' for dialing, the base station triggers the channel using positive or negative level.
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See if and where the voltage changes.
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The trigger is just about two seconds long, so check your meter quickly after pressing 'd'.
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Once the base station timed out, press 'h' for hangup and try again.
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</p>
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<font size='4'><pre>
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./bnetz/bnetz -k 1 -P positive
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...
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on-hook: 55555 (enter 0..9 or d=dial)
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call.c:437 info : Outgoing call to 55555
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bnetz.c:757 info : Call to mobile station, paging station id '55555'
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bnetz.c:375 info : Entering paging state (try 1), sending 'Selektivruf' to '55555'.
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bnetz.c:411 info : Paging mobile station 55555 complete, waiting for answer.
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</pre></font>
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<p align='justify'>
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Now again it is up to your own to make the transmitter switch to channel 19 on trigger level.
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If you use a second transmitter, use the tigger to press the PTT button.
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</p>
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[<a href="index.html">Back to main page</a>]
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</font></td></tr></table></center>
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</body>
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</html>
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