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Add option to cross-connect calls; Calls between mobiles are now possible

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Use -x to enable call cross-connect. No MNCC socket, no call device must
be specified!

Be sure to have at least one control channel and two voice channels.
Alternatively you can use one combined control/voice channel and one
voice channel.
This commit is contained in:
Andreas Eversberg
2017-10-29 07:58:20 +01:00
parent 87a21a285a
commit e8a3306eee
5 changed files with 330 additions and 30 deletions
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docs/software.html
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@@ -139,29 +139,6 @@ Finally store the settings using "alsactl store" command.
Do this whenever you want to keep your adjustments.
</p>
<p class="toppic">
Channel crossing
</p>
<p>
By default, the right channel of your sound adapter is used to connect to the radio.
Some adapters have mono input, especially on microphone jack.
In this case you will always receive audio, no matter if you cross the channels or not.
If you cross the channels, the left channel of your sound adapter is used.
I use mono cables with only one channel on the tip of the plug.
Usual sound adapters connect left channel on the tip of the plug, so we need to swap channels to use mono plugs.
Use the command line option '-x' or '--cross':
</p>
<pre>
# src/bnetz/bnetz -k 1 -x -l 2
bnetz.c:268 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.
</pre>
<p class="toppic">
Emphasis
</p>
@@ -334,6 +311,44 @@ Current transceiver and call state can be viewed by pressing 'c' key.
Press 'c' again to turn off this view.
</p>
<p class="toppic">
Mobile to mobile calls
</p>
<p>
Calls can be forwarded between mobiles.
By default, only one call can be made with the built-in console.
If a headset is used, only one call can be made between headset and one mobile station.
If call forwarding is used, two (or more) mobile stations can directly call each other.
It is essential to have at least two voice channels of course.
Depending on the network, a control channel or alternatively a combined control+voice channel is required.
This feature makes sense for SDR only, because SDR can provide multiple voice and control channels.
(It is also possible to use two radio receivers and transmitters connected to a sound card.)
</p>
<p>
To forward calls, be sure to configure the network with at least two channels that support voice.
Add '-x' to your command line.
On one phone, enter the number of the other phone and start the call.
</p>
<pre>
nmt -k 1 -k 4 -a hw:0,0 -a hw:0,0 -T CC/TC -T TC -0 1 -0 2 -Y se,1 -x
</pre>
<p>
This example will run a base station with two channel (1 and 4) via two radios connectd to a stereo sound card.
The sound card is accessed via '-a hw:0,0'.
Because the sound card is stereo, the '-a' option can be given for two channels.
The first channel is a combined control+traffic channel and the second a traffic channel.
Both channels have different supervisory signals '-0 1 -0 2'.
The station code is '-Y se,1'.
Refer to NMT section about configuring an NMT network.
I highly recommend to use an SDR instead of radios connected to a sound card.
</p>
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