1. DTMF
(GSM Glossary/Glossary)

...through "D" are "system" codes. Most end users won't need any of those; they are used to configure phone exchanges or to perform other special functions. ...

2. Technical introduction to GSM modem technology
(Tech. Info/Info GSM / UMTS)

... piece of device which acts as a spy in the system. Can be a good debugging utility wherein a person can configure/monitor a remote PC based system and even rectify it. Some companies do sell t...

3. Tranceiver ISM-868
(2.4 GHz modules/Transceiver Modules)

...ing unreceived packets. The host system does not have to perform any radio-specific tasks. The module can be configured in many ways and supports data transfer with fast channel and address switching....

4. Tranceiver ISM-2400
(2.4 GHz modules/Transceiver Modules)

...ng unreceived packets. The host system does not have to perform any radio-specific tasks. The module can be configured in many ways and supports data transfer with fast channel and address switching....