From e8a3306eee9eadd8d8d2547ed4e6c012a155109b Mon Sep 17 00:00:00 2001 From: Andreas Eversberg Date: Sun, 29 Oct 2017 07:58:20 +0100 Subject: Add option to cross-connect calls; Calls between mobiles are now possible 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. --- docs/software.html | 61 ++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 38 insertions(+), 23 deletions(-) (limited to 'docs') diff --git a/docs/software.html b/docs/software.html index 731899d..944e2a5 100644 --- a/docs/software.html +++ b/docs/software.html @@ -139,29 +139,6 @@ Finally store the settings using "alsactl store" command. Do this whenever you want to keep your adjustments.

-

-Channel crossing -

- -

-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': -

- -
-
-# 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.
-
-
-

Emphasis

@@ -334,6 +311,44 @@ Current transceiver and call state can be viewed by pressing 'c' key. Press 'c' again to turn off this view.

+

+Mobile to mobile calls +

+ +

+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.) +

+ +

+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. +

+ +
+
+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
+
+
+ +

+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. +

+
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