diff options
| author | Andreas Eversberg <jolly@eversberg.eu> | 2016-03-01 18:40:38 +0100 |
|---|---|---|
| committer | Andreas Eversberg <jolly@eversberg.eu> | 2016-03-13 09:12:11 +0100 |
| commit | 946c9ce10a92a29584d2e68e9c04fe63dcee7bdc (patch) | |
| tree | f400ab2212900957e358ef236f07307492ecf2d9 /docs/b-netz.html | |
initial git import
Diffstat (limited to 'docs/b-netz.html')
| -rw-r--r-- | docs/b-netz.html | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/docs/b-netz.html b/docs/b-netz.html new file mode 100644 index 0000000..62dd787 --- /dev/null +++ b/docs/b-netz.html @@ -0,0 +1,109 @@ +<html> +<head> +<title>osmocom-analog</title> +</head> +<body> +<center><table border='0' cellspacing='0' cellpadding='0' width='816'><tr><td><font face="ARIAL" size='5'> + +<h2><center>B-Netz</center></h2> + +<center><img src="b-netz.jpg"/></center> + +<p align='justify'> +Before testing this software, power on your B-Netz. +Refer to the manual how to dial a number. +Start dialing and after some seconds you should hear a busy signal. +This means that the phone sweeps over all channels to find a base startion. +If no free base station is found, you will get a busy signal. +</p> + +<center><img src="b-netz-display.jpg"/></center> + +<p align='justify'> +Now run your base station on channel 1. +Tune the transmitter to 153.010 MHz and the receiver to 148.410. +You should tune the receiver to 153.010 first, to check if you hear the idle signal from the base station. +Then tune to actually uplink frequency 148.410 MHz. +</p> + +<font size='4'><pre> +# src/bnetz/bnetz -k 1 +... +bnetz.c:316 info : Entering IDLE state, sending 'Gruppenfreisignal' 2 on channel 1. +Base station ready, please tune transmitter to 153.010 MHz and receiver to 148.410 MHz. +To call phone, switch transmitter (using pilot signal) to 153.370 MHz. +on-hook: ..... (enter 0..9 or d=dial) +</pre></font> + +<p align='justify'> +Now dial again on the phone and watch the base station receiving the call: +</p> + +<font size='4'><pre> +bnetz.c:471 info : Received signal 'Kanalbelegung' from mobile station, sending signal 'Wahlabruf'. +bnetz.c:561 info : Received station id from mobile phone: 50993 +bnetz.c:569 info : Received number from mobile phone: 800330100 +bnetz.c:571 info : Sending station id back to phone: 50993. +bnetz.c:631 info : Dialing complete 50993->0800330100, call established. +bnetz.c:637 info : Setup call to network. +call.c:574 info : Incomming call from '50993' to '0800330100' +bnetz.c:669 notice : Received 'Schlusssignal' from mobile station +bnetz.c:352 info : Entering IDLE state, sending 'Gruppenfreisignal' 2. +call.c:695 info : Call has been released with cause=16 +</pre></font> + +<p align='justify'> +The first thing the phone does is to find the channel 1. +Then it transmits a signal tone, called 'Kanalbelegung'. +The base station responds and sends a signal tone, called 'Wahlabruf'. +Then the phone sends caller ID + number. +The base station replies the caller ID to prevent false transmissions. +After establishment, you can use the headset, if present, for speech communication with the phone. +If you hangup the phone, the call gets released by a message, called 'Schlusssignal'. +The base station returns to idle. +</p> + +<p align='justify'> +In order to call the phone from the base station, you need to transmit channel 19. +Your transmitter must tune to 153.370 MHz in order to page the phone. +The phones listens to incomming signals from the base station. +In order to transmit on channel 19, you may use a second transmitter or re-tune your single transmitter. +There are many ways todo that, but it is actually up to your own how to couple it and how to control your transmitter. +I use an optocoupler to tell my transmitter to switch to channel 19. +</p> + +<center><img src="trigger-1.jpg"/></center> +<br> +<center><img src="trigger-2.jpg"/><img src="trigger-3.jpg"/></center> + +<p align='justify'> +I measure about 3 Volts peak on the ouput of the USB chip I use. +Since my optocoupler triggers at arround 1 Volts, I have two Volts on the Resistor, which results in 10 mA current. +In order to check and change the voltage, use '-P positive' or '-P negative' option to select trigger level on one audio channel. +Run the base station and enter a 5 digit number. +Measure the voltage on both audio output channels. +Once you press 'd' for dialing, the base station triggers the channel using positive or negative level. +See if and where the voltage changes. +The trigger is just about two seconds long, so check your meter quickly after pressing 'd'. +Once the base station timed out, press 'h' for hangup and try again. +</p> + +<font size='4'><pre> +./bnetz/bnetz -k 1 -P positive +... +on-hook: 55555 (enter 0..9 or d=dial) +call.c:437 info : Outgoing call to 55555 +bnetz.c:757 info : Call to mobile station, paging station id '55555' +bnetz.c:375 info : Entering paging state (try 1), sending 'Selektivruf' to '55555'. +bnetz.c:411 info : Paging mobile station 55555 complete, waiting for answer. +</pre></font> + +<p align='justify'> +Now again it is up to your own to make the transmitter switch to channel 19 on trigger level. +If you use a second transmitter, use the tigger to press the PTT button. +</p> + +[<a href="index.html">Back to main page</a>] +</font></td></tr></table></center> +</body> +</html> |