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@ -29,15 +29,19 @@ History
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<p>
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<p>
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<ul>
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<ul>
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<li>Frequency range:
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<li>Frequency range base station: 869.040 MHz - 893.970 MHz
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<li>xxx voice channels
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<li>Frequency range mobile station: 824.040 MHz - 848.970 MHz
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<li>Control channels: 21 for System A
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<li>Voice channels: 395 for System A (formerly 312)
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<li>Control channels: 21 for System B
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<li>Voice channels: 395 for System B (formerly 312)
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<li>Duplex distance: 45 MHz
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<li>Duplex distance: 45 MHz
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<li>Channel spacing: 30 KHz
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<li>Channel spacing: 30 KHz
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<li>Voice modulation: FM
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<li>Voice modulation: FM
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<li>Signalling modulation: carrier FSK
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<li>Signalling modulation: carrier FSK
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<li>Frequency deviation: 8 KHz (FSK)
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<li>Frequency deviation: 8 KHz (FSK)
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<li>Mobile station transmit power:
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<li>Mobile station transmit power: 4 Watts (vehicular) 1.6 or 0.6 Watts
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<li>Base station transmit power:
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<li>Base station transmit power: ??? (around 50 Watts)
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</ul>
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</ul>
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</p>
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</p>
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331
docs/c-netz.html
331
docs/c-netz.html
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@ -24,16 +24,16 @@ History
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<p>
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<p>
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C-Netz was the third mobile telephone network in Germany.
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C-Netz was the third mobile telephone network in Germany.
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It existed between 1984 (officially Mai 1985) and December 2000.
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It existed between 1984 (officially Mai 1985) and December 2000.
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In 1989, the German Wall came down and C-Netz was quickly deployed in eastern Germany to support the congested fixed network.
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It was the first cellular system, so frequencies could be used more efficiently.
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It was the first cellular system, so frequencies could be used more efficiently.
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It offered handover capability, so moving phones can change cells during a call.
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It offered handover capability, so moving phones could change cells during a call.
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New was the SIM card, which was similar to GSM.
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The SIM card was introduced, which is similar to GSM.
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This card allowed to use phones by different subscribers with different subscriber numbers.
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This card allowed to use phones by different subscribers with different subscriber numbers.
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Authentication was used to prevent fraud, but is was used only with SIM card phones.
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Authentication was used to prevent fraud, but it was used only with SIM card phones. The magnetic cards could be cloned by receiving 'roaming' messages.
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Extra services (e.g. conditional call forwarding, answering machine) were installed in the mobile network.
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Extra services (e.g. conditional call forwarding, answering machine) were installed in the mobile exchange.
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A scrambler inside the phone and base station prevented eavedropping with radio scanners.
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A scrambler inside the phone and base station prevented eavedropping with radio scanners.
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Phones became smaller and portable, even handheld phones were available.
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Phones became smaller and portable, even handheld phones were available.
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It used full duplex radio link.
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All phones were available under a dedicated prefix, so the caller must not know the location of the phone anymore.
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All phones were available under a dedicated prefix, so the caller must to know the location of the phone anymore.
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</p>
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</p>
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@ -59,10 +59,125 @@ All phones were available under a dedicated prefix, so the caller must to know t
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<p class="toppic">
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<p class="toppic">
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<a name="howitworks"></a>
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<a name="howitworks"></a>
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How it works
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</p>
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</p>
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<p>
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<p>
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*TBD*
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Like AMPS (Advanced Mobile Phone Service), the C-Netz is a cellular network.
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</p>
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<center><img src="c-netz_zellstruktur.png"/></center>
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<p>
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Base stations are grouped into clusters.
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Each cluster has arround 7 base stations.
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Each base station in a cluster must have different channels.
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As depictet, the frequency of a base station marked with "1" can be re-used in other clusters.
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To handle more calls with the same amount of channels, the size of a cell must be reduced.
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By using small cell structure, it is likely to loose radio link while calling and moving at the same time.
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To prevent loss of radio link while moving to far away from a cell, handover to stronger or closer cell is performed.
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</p>
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<center><img src="c-netz_frequenzen.png"/></center>
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<p>
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Two frequency bands are used, one for uplink and one downlink.
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Only one exception is the control channel "131".
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It is the same for all base stations.
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To avoid collisions, the channel is divided into time slots.
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The time slots are re-used in the same way as channels are re-used in other clusters.
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This reduces the number of channels for call setup to only one channel.
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The mobile phone does not have to search for a valid control channel first.
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Also it is possible to have a dedicated control channel for cells in high traffic areas.
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</p>
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<center><img src="c-netz_zeitschlitze.png"/></center>
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<p>
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As depicted, the base station and mobile station use one or more time slots.
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Generally every 8th time slot is used.
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In this case the base station transmits every 600ms.
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The mobile phone transmits two time slots later.
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Every time slot contains two message blocks.
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One block is used for call setup.
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The other block is used for periodic check if the phone is still available.
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</p>
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<p>
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Message blocks contain 70 bits.
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The first 6 bits define the message type.
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The other 64 bits depend on the message type.
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The 70 bits are grouped into 10 words of 7 bits each.
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Eeach word gets 8 redudancy bits by using a BCH code.
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The redundany allows to correct up to two bit errors in a word.
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</p>
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<center><img src="c-netz_interleaving.png"/></center>
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<p>
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To correct burst errors (several bit errors after each other), the bits are interleaved before transmitted.
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As depicted above, the first bit of all words are transmitted first, then the next bit and so on.
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</p>
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<center><img src="c-netz_frame_k.png"/></center>
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<p>
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A sync word of 11 bits is added in front of each message three times.
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Additional 14 guard bits are used to allow the transmitter to ramp up and down RF power between time slots.
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</p>
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<center><img src="c-netz_frame_v.png"/></center>
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<p>
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Also message blocks are transmitted during voice conversation.
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The blocks are used to terminate the call, perform handover, measure link or transmit metering information.
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4 bits the message is transmitted every 12.5 ms. After 600 ms, the complete frame is transmitted.
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To remove the 4 bits from audio stream, the voice is time compressed (speed up) to 10/11th.
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The 4 bits + 2 guard bits are transmitted in the 1/11th gap between voice chunks.
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On the receiving end, the voice chunks are expanded again.
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The phone will keep in sync with the voice chunks by keeping in sync with the message bits.
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</p>
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<center><img src="c-netz_frame_v2.png"/></center>
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<p>
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The level at the end of one voice chunk may not match the level of the beginning of the next chunk.
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The offset must be removed by the receiver.
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</p>
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<center><img src="c-netz_lr.png"/></center>
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<p>
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This is an example of a broadcast message by a base station on the control channel.
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The message type 'O' (letter o) is "100111", so this message block contains cell informations and access informations.
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</p>
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<center><img src="c-netz_symbole.png"/></center>
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<p>
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The location of parameters inside a message (information elements) are shown by letters.
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Each letter is a different parameter as depicted above.
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</p>
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<center><img src="c-netz_call.png"/></center>
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<p>
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The first thing a phone does is looking for a strongest cell.
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The phone accesses the cell by transmitting a location update message.
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The cell acknowledges or rejects the phone.
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</p>
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<p>
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The call setup is depiced above.
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The mobile phone transmits a message that it wishes to make a normal call or emergency call.
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If the channel is available, the base station requests the dialed number from the phone.
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The phone transmits the dialed number.
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If the number is ok, the base station acknowledges the dialed number.
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After a voice channel is allocated, the phone is requested to change to that channel two time slots later.
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On this voice channel, the mobe phone and the base station transmit 8 messages to prove quality of channel.
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Messages VH1 and VHK are transmitted while the call is set up.
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Then the phone is ordered to switch to voice conversation.
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The following messages are transmitted between the voice chunks.
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</p>
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</p>
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<p class="toppic">
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<p class="toppic">
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@ -88,14 +203,14 @@ We need to calibrate the speed of our transmit signal (and receive signal as wel
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<p>
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<p>
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First of all we need a reference clock.
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First of all we need a reference clock.
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Since most systems have standard crystals, we cannot use our system clock as reference without any help.
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Since most computer systems have standard crystals, we cannot use our system clock as reference without any help.
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I decided to use the NTP daemon.
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I decided to use the NTP daemon.
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After running the system for several days, the clock speed should be accurate enough for our needs.
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After running the system for several days, the clock speed should be accurate enough for our needs.
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Be sure to choose a place with constant temperature.
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Be sure to choose a place for your PC with constant temperature.
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</p>
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</p>
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<p>
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<p>
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In /etc/ntp.conf define one or more servers to geht the time from. I suggest to use the German atom clock of the PTB:
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In /etc/ntp.conf define one or more servers to get the time from. I suggest to use the German atom clock of the PTB:
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</p>
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</p>
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<pre>
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<pre>
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@ -142,7 +257,7 @@ To minimize this effect, don't use extension cables.
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<p>
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<p>
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Since we have precise system clock now, we can measure the speed of our sound adapter.
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Since we have precise system clock now, we can measure the speed of our sound adapter.
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Later we will use the measurement result to adjust our signal processor.
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Later we will use the measurement result to adjust our signal processor.
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Be sure to have your machine running for at least 3-4 days (with your sound adapter attached, in case you have USB sound adapter).
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Be sure to have your machine running for at least 5 to 7 days (with your sound adapter attached, in case you have USB sound adapter).
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The machine must have network connection to the NTP server.
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The machine must have network connection to the NTP server.
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I suggest to use 'ntp1.ptb.de' and 'ntp2.ptb.de' as reference.
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I suggest to use 'ntp1.ptb.de' and 'ntp2.ptb.de' as reference.
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Use command line option '-M' or '--measure' to measure my sound adapter.
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Use command line option '-M' or '--measure' to measure my sound adapter.
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@ -258,6 +373,200 @@ When we make a call and another phone is regisered, the phone will loose coverag
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After the call, the other phone re-registers again.
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After the call, the other phone re-registers again.
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</p>
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</p>
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<p>
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Now power up a phone.
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Depening on your card reader, insert chip or magnetic card.
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Hopefully you get a response from the phone.
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If it responds, you will hear a short burs on receiver.
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This bursts is just 37.5 ms long and sounds a bit less noisy than the noise floor.
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If the burst is received and correctly decoded, the base station knows the transmitter's polarty and selects it.
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</p>
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<pre>
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telegramm.c:1486 info : RX Level: 96% Jitter: 0.04 Sync Time: 3968.18 (TS 10.02) POSITIVE
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***********************************************
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*** Autoselecting positive FSK TX polarity! ***
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***********************************************
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cnetz.c:895 info : Received Attachment 'Einbuchen' message from Subscriber '6215784' with chip card's security code 11029
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transaction.c:208 info : Transaction state IDLE -> EM
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transaction.c:70 info : Created transaction for subscriber '6215784'
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database.c:117 info : Adding subscriber '6,2,15784' to database.
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database.c:121 info : Subscriber '6,2,15784' busy now.
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cnetz.c:709 notice : Frame sync offset = 800.18, correcting!
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cnetz.c:760 info : Sending acknowledgement 'Einbuchquittung' to Attachment request.
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database.c:124 info : Subscriber '6,2,15784' idle now.
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transaction.c:89 info : Destroying transaction for subscriber '6215784'
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transaction.c:208 info : Transaction state EM -> IDLE
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</pre>
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<p>
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Level adjustment:
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We see a receive level of arround 96%.
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This is already good, since I did the adjustment previously.
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Tune your receiver to the uplink frequency, so you get loopback of base station broadcast.
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Use the variable resistor (connecting your transmitter) to adjust the volume until the RX level matches the same level of your previously received bust.
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In my case I adjust the transmitter to match arround 96%. (+- 10% is good)
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Now, whatever frequency deviation the phone transmits for signalling, so does your base station.
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Use the other variable resistor (connecting your receviver) to adjust the volume until the level matches about 100%. (+- 10% is good)
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Switch back the receiver to uplink frequency and restart the phone.
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</p>
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<p>
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After some time (1 minute) the base station will check, if the phone is still available.
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It transmits a request (MA) to the phone.
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The phone answers to the request (MFT):
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</p>
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<pre>
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telegramm.c:1473 info : Ignoring mysterious unmodulated telegramm (noise from phone's transmitter)
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database.c:72 info : Check, if subscriber '6,2,15784' is still available.
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transaction.c:208 info : Transaction state IDLE -> MA
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transaction.c:70 info : Created transaction for subscriber '6215784'
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database.c:121 info : Subscriber '6,2,15784' busy now.
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cnetz.c:863 info : Sending keepalive request 'Meldeaufruf'
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transaction.c:208 info : Transaction state MA -> MFT
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telegramm.c:1486 info : RX Level: 96% Jitter: 0.02 Sync Time: 6534.01 (TS 16.50) POSITIVE
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cnetz.c:969 info : Received acknowledge 'Meldung Funktelefonteilnehmer' message from Subscriber '6215784'
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database.c:124 info : Subscriber '6,2,15784' idle now.
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transaction.c:89 info : Destroying transaction for subscriber '6215784'
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transaction.c:208 info : Transaction state MFT -> IDLE
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</pre>
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<p>
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To make a call from the phone to the base station, just enter some digits and press the dial button on the phone.
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The phone requests a call (VWG).
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The base station requests dialed number (WAF).
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The phone transmits dialed number (WUE).
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The base station acknowledges the call (WBP) and then orders the phone to switch to speech channel (VAG).
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Then measurement and through connection of speech takes place:
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</p>
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<pre>
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telegramm.c:1486 info : RX Level: 96% Jitter: 0.04 Sync Time: 12671.99 (TS 32.00) POSITIVE
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cnetz.c:931 info : Received outgoing Call 'Verbindungswunsch gehend' message from Subscriber '6215784'
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transaction.c:208 info : Transaction state IDLE -> VWG
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transaction.c:70 info : Created transaction for subscriber '6215784'
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database.c:121 info : Subscriber '6,2,15784' busy now.
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cnetz.c:854 info : Sending acknowledgement 'Wahlaufforderung' to outging call
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transaction.c:208 info : Transaction state VWG -> WAF
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telegramm.c:1486 info : RX Level: 95% Jitter: 0.04 Sync Time: 3366.02 (TS 8.50) POSITIVE
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cnetz.c:957 info : Received dialing digits 'Wahluebertragung' message from Subscriber '6215784' to Number '02123839349'
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transaction.c:208 info : Transaction state WAF -> WBP
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cnetz.c:782 info : Sending call accept 'Wahlbestaetigung positiv'.
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transaction.c:208 info : Transaction state WBP -> VAG
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cnetz.c:789 info : Sending channel assignment 'Verbindungsaufbau gehend'.
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transaction.c:208 info : Transaction state VAG -> BQ
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cnetz.c:807 info : Staying on combined calling + traffic channel 131
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dsp.c:641 info : Switching channel (mode)
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cnetz.c:1014 info : Sending 'Belegungsquittung' on traffic channel
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cnetz.c:1014 info : Sending 'Belegungsquittung' on traffic channel
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cnetz.c:1014 info : Sending 'Belegungsquittung' on traffic channel
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telegramm.c:1486 info : RX Level: 96% Jitter: 0.02 Sync Time: 9504.02 (TS 24.00) POSITIVE
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cnetz.c:1118 info : Received allocation 'Belegung' message.
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cnetz.c:1014 info : Sending 'Belegungsquittung' on traffic channel
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telegramm.c:1486 info : RX Level: 96% Jitter: 0.02 Sync Time: 9701.99 (TS 24.50) POSITIVE
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cnetz.c:1118 info : Received allocation 'Belegung' message.
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...
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transaction.c:208 info : Transaction state BQ -> VHQ
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telegramm.c:1486 info : RX Level: 96% Jitter: 0.03 Sync Time: 10494.00 (TS 26.50) POSITIVE
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cnetz.c:1118 info : Received allocation 'Belegung' message.
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cnetz.c:1024 info : Sending 'Quittung Verbindung halten' on traffic channel
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telegramm.c:1486 info : RX Level: 96% Jitter: 0.03 Sync Time: 10691.98 (TS 27.00) POSITIVE
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cnetz.c:1118 info : Received allocation 'Belegung' message.
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...
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call.c:623 info : Incomming call from '6215784' to '02123839349'
|
||||||
|
transaction.c:208 info : Transaction state VHQ -> DS
|
||||||
|
telegramm.c:1486 info : RX Level: 96% Jitter: 0.02 Sync Time: 11286.00 (TS 28.50) POSITIVE
|
||||||
|
cnetz.c:1145 info : Received connection hold 'Verbindung halten' message.
|
||||||
|
cnetz.c:1051 info : Sending 'Durchschalten' on traffic channel
|
||||||
|
telegramm.c:1486 info : RX Level: 96% Jitter: 0.03 Sync Time: 11483.99 (TS 29.00) POSITIVE
|
||||||
|
cnetz.c:1145 info : Received connection hold 'Verbindung halten' message.
|
||||||
|
...
|
||||||
|
telegramm.c:1486 info : RX Level: 96% Jitter: 0.03 Sync Time: 12276.00 (TS 31.00) POSITIVE
|
||||||
|
cnetz.c:1131 info : Received assignment confirm 'Durchschaltung Quittung' message.
|
||||||
|
cnetz.c:1051 info : Sending 'Durchschalten' on traffic channel
|
||||||
|
telegramm.c:1486 info : RX Level: 97% Jitter: 0.02 Sync Time: 12474.01 (TS 31.50) POSITIVE
|
||||||
|
cnetz.c:1131 info : Received assignment confirm 'Durchschaltung Quittung' message.
|
||||||
|
...
|
||||||
|
transaction.c:208 info : Transaction state DS -> VHQ
|
||||||
|
telegramm.c:1486 info : RX Level: 96% Jitter: 0.03 Sync Time: 1781.99 (TS 4.50) POSITIVE
|
||||||
|
cnetz.c:1131 info : Received assignment confirm 'Durchschaltung Quittung' message.
|
||||||
|
dsp.c:641 info : Switching channel (mode)
|
||||||
|
cnetz.c:1238 info : Sending 'Quittung Verbindung halten' on traffic channel
|
||||||
|
cnetz.c:1238 info : Sending 'Quittung Verbindung halten' on traffic channel
|
||||||
|
cnetz.c:1238 info : Sending 'Quittung Verbindung halten' on traffic channel
|
||||||
|
telegramm.c:1486 info : RX Level: 97% Jitter: 0.07 Sync Time: 5544.05 (TS 14.00) POSITIVE
|
||||||
|
cnetz.c:1286 info : Received supervisory frame 'Verbindung halten' message.
|
||||||
|
cnetz.c:1238 info : Sending 'Quittung Verbindung halten' on traffic channel
|
||||||
|
telegramm.c:1486 info : RX Level: 97% Jitter: 0.07 Sync Time: 8712.02 (TS 22.00) POSITIVE
|
||||||
|
cnetz.c:1286 info : Received supervisory frame 'Verbindung halten' message.
|
||||||
|
cnetz.c:1238 info : Sending 'Quittung Verbindung halten' on traffic channel
|
||||||
|
telegramm.c:1486 info : RX Level: 97% Jitter: 0.09 Sync Time: 11880.04 (TS 30.00) POSITIVE
|
||||||
|
cnetz.c:1286 info : Received supervisory frame 'Verbindung halten' message.
|
||||||
|
cnetz.c:1238 info : Sending 'Quittung Verbindung halten' on traffic channel
|
||||||
|
...
|
||||||
|
|
||||||
|
</pre>
|
||||||
|
|
||||||
|
<p>
|
||||||
|
When calling to the phone, enter the mobile station's ID and press 'd' for dial.
|
||||||
|
If the phone is attached, the base station orders the phone to switch to speech channel (VAK).
|
||||||
|
The rest is similar to incomming calls, excpet the the phone has to answer before the speech is throughconnected:
|
||||||
|
</p>
|
||||||
|
|
||||||
|
<pre>
|
||||||
|
|
||||||
|
call.c:490 info : Outgoing call to 6215784
|
||||||
|
cnetz.c:416 info : Call to mobile station, paging station id '6215784'
|
||||||
|
transaction.c:208 info : Transaction state IDLE -> VAK
|
||||||
|
transaction.c:70 info : Created transaction for subscriber '6215784'
|
||||||
|
database.c:121 info : Subscriber '6,2,15784' busy now.
|
||||||
|
cnetz.c:792 info : Sending channel assignment 'Verbindungsaufbau kommend'.
|
||||||
|
transaction.c:208 info : Transaction state VAK -> BQ
|
||||||
|
cnetz.c:807 info : Staying on combined calling + traffic channel 131
|
||||||
|
dsp.c:641 info : Switching channel (mode)
|
||||||
|
cnetz.c:1014 info : Sending 'Belegungsquittung' on traffic channel
|
||||||
|
cnetz.c:1014 info : Sending 'Belegungsquittung' on traffic channel
|
||||||
|
cnetz.c:1014 info : Sending 'Belegungsquittung' on traffic channel
|
||||||
|
telegramm.c:1486 info : RX Level: 96% Jitter: 0.03 Sync Time: 6335.99 (TS 16.00) POSITIVE
|
||||||
|
cnetz.c:1118 info : Received allocation 'Belegung' message.
|
||||||
|
cnetz.c:1014 info : Sending 'Belegungsquittung' on traffic channel
|
||||||
|
telegramm.c:1486 info : RX Level: 95% Jitter: 0.03 Sync Time: 6534.06 (TS 16.50) POSITIVE
|
||||||
|
cnetz.c:1118 info : Received allocation 'Belegung' message.
|
||||||
|
|
||||||
|
</pre>
|
||||||
|
|
||||||
|
<p>
|
||||||
|
When the mobile phon terminates, it sends the AT message.
|
||||||
|
The base station responds with AF message and switches back to control channel.
|
||||||
|
</p>
|
||||||
|
|
||||||
|
<pre>
|
||||||
|
|
||||||
|
telegramm.c:1486 info : RX Level: 97% Jitter: 0.06 Sync Time: 11880.01 (TS 30.00) POSITIVE
|
||||||
|
cnetz.c:1286 info : Received supervisory frame 'Verbindung halten' message.
|
||||||
|
cnetz.c:1238 info : Sending 'Quittung Verbindung halten' on traffic channel
|
||||||
|
telegramm.c:1486 info : RX Level: 97% Jitter: 0.06 Sync Time: 2375.99 (TS 6.00) POSITIVE
|
||||||
|
cnetz.c:1297 info : Received release frame 'Ausloesen durch FuTln' message.
|
||||||
|
transaction.c:208 info : Transaction state VHQ -> AT
|
||||||
|
call.c:744 info : Call has been released with cause=16
|
||||||
|
cnetz.c:1253 info : Sending 'Auslosen durch FuTln' on traffic channel
|
||||||
|
database.c:124 info : Subscriber '6,2,15784' idle now.
|
||||||
|
transaction.c:89 info : Destroying transaction for subscriber '6215784'
|
||||||
|
transaction.c:208 info : Transaction state AT -> IDLE
|
||||||
|
cnetz.c:274 info : Entering IDLE state on channel 131.
|
||||||
|
telegramm.c:1486 info : RX Level: 96% Jitter: 0.06 Sync Time: 5543.98 (TS 14.00) POSITIVE
|
||||||
|
dsp.c:641 info : Switching channel (mode)
|
||||||
|
telegramm.c:1484 info : RX Level: 97% Jitter: 0.08 Sync Time: 9333.99 (TS 23.57) Bit errors: 6 POSITIVE
|
||||||
|
telegramm.c:1525 notice : Received Telegramm that is not used OgK channel signalling, ignoring! (opcode 22 = AT(V))
|
||||||
|
|
||||||
|
</pre>
|
||||||
|
|
||||||
|
|
||||||
[<a href="index.html">Back to main page</a>]
|
[<a href="index.html">Back to main page</a>]
|
||||||
</td></tr></table></center>
|
</td></tr></table></center>
|
||||||
|
|
|
@ -6,17 +6,22 @@
|
||||||
<body>
|
<body>
|
||||||
<center><table><tr><td>
|
<center><table><tr><td>
|
||||||
|
|
||||||
|
<br><br>
|
||||||
|
|
||||||
<h2><center>osmocom-analog</center></h2>
|
<h2><center>osmocom-analog</center></h2>
|
||||||
|
|
||||||
|
<br><br>
|
||||||
|
|
||||||
<center>
|
<center>
|
||||||
<img src="a-netz_small.jpg"/><img src="b-netz_small.jpg"/><br>
|
<img src="a-netz_small.jpg" title="A-Netz"/><img src="b-netz_small.jpg" title="B-Netz"/><br>
|
||||||
<img src="c-netz_small.jpg"/><img src="nmt_small.jpg"/><br>
|
<img src="c-netz_small.jpg" title="C-Netz"/><img src="nmt_small.jpg" title="Nordisk Mobil Telefon"/><br>
|
||||||
|
<img src="amps_small.jpg" title="Advanced Mobile Phone Service"/><img src="setup_small.jpg"/><br>
|
||||||
</center>
|
</center>
|
||||||
|
|
||||||
<br><br>
|
<br><br>
|
||||||
|
|
||||||
<p>
|
<p>
|
||||||
A base station implementation for classic mobile networks. All these networks use analog voice transmission. The signalling is done by tones and/or FSK modulated digital messages. It started with the idea to make a base station for the German B-Netz, but more networks followed.
|
A base station implementation of classic mobile networks. All these networks use analog voice transmission. The signalling is done by tones and/or FSK modulated digital messages. It started with the idea to make a base station for the German B-Netz, but more networks followed.
|
||||||
</p>
|
</p>
|
||||||
|
|
||||||
<center>
|
<center>
|
||||||
|
@ -25,14 +30,25 @@ A base station implementation for classic mobile networks. All these networks us
|
||||||
<li><a href="install.html">Software installation</a></li>
|
<li><a href="install.html">Software installation</a></li>
|
||||||
<li><a href="headset.html">Connecting headset</a></li>
|
<li><a href="headset.html">Connecting headset</a></li>
|
||||||
<li><a href="software.html">Software usage</a></li>
|
<li><a href="software.html">Software usage</a></li>
|
||||||
<li><a href="a-netz.html">A-Netz</a></li>
|
|
||||||
<li><a href="b-netz.html">B-Netz</a></li>
|
|
||||||
<li><a href="c-netz.html">C-Netz</a></li>
|
|
||||||
<li><a href="nmt.html">NMT</a></li>
|
|
||||||
<li><a href="amps.html">AMPS</a></li>
|
|
||||||
</ul>
|
</ul>
|
||||||
</center>
|
</center>
|
||||||
|
|
||||||
|
<p>
|
||||||
|
Implemented networks:
|
||||||
|
</p>
|
||||||
|
|
||||||
|
<center>
|
||||||
|
<ul>
|
||||||
|
<li><a href="a-netz.html">A-Netz</a> (Germany)</li>
|
||||||
|
<li><a href="b-netz.html">B-Netz</a> (Germany)</li>
|
||||||
|
<li><a href="c-netz.html">C-Netz</a> (Germany)</li>
|
||||||
|
<li><a href="nmt.html">NMT - Nordic Mobile Telephone</a> (Scandinavia)</li>
|
||||||
|
<li><a href="amps.html">AMPS - Advanced Mobile Phone Service</a> (USA)</li>
|
||||||
|
</ul>
|
||||||
|
</center>
|
||||||
|
|
||||||
|
<br><br>
|
||||||
|
|
||||||
</td></tr></table></center>
|
</td></tr></table></center>
|
||||||
</body>
|
</body>
|
||||||
</html>
|
</html>
|
||||||
|
|
Loading…
Reference in New Issue