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diff --git a/docs/radiocom2000.html b/docs/radiocom2000.html index c6924d6..34e2f97 100644 --- a/docs/radiocom2000.html +++ b/docs/radiocom2000.html @@ -23,6 +23,38 @@ History </p> +<p> +Radiocom 2000 (sometimes R2000) was a cellular network used in France. +The network was developed by France Telekom and Matra and became the third mobile network. +There are many similarities to the NMT network, but it was a complete own design. +Development started in 1981 and the network was launched in Paris in 1985, it gradually replaced the second network "correspondance publique". +It was a cellular system, so frequencies could be used efficiently. +The system was capable of allocating channels dynamically. +Handover was implemented later and called RHD "Réseau Haute Densité" (network with high desity). +It was possible to run private base station, where own mobiles were allowed to call only. +In 1988, it had 60,000 subscribers and more than 90% of devices are installed in vehicles. +Originally the 200 MHz and 400 MHz bands were used. +Due to congesting in 1990, the 900 MHz band was introduced. +The network was closed for the exclusive benefit of the standard GSM in July 28th 2000. +</p> + +<p> +<ul> + <li>Frequency range UHF: 424.800 - 427.9875 MHz (down-link); 414.800 - 417.9875 MHz (up-link) + <li>256 voice or contol channels + <li>Duplex distance: 10 MHz + <li>Channel spacing: 12.5 KHz + <li>Voice modulation: FM + <li>Signaling modulation: carrier FSK + <li>Frequency deviation: 1500 Hz ??? (Voice); 1425 Hz (FSK) + <li>Mobile station transmit power: 1 or 6..10 Watts + <li>Features: Speech Compandor (BS->MS only), Group calls +</ul> +</p> + +<p> +</p> + <p class="toppic"> <a name="howitworks"></a> How it works |