| 摘要 |
A cellular telephone communication protocol enables a communication link primarily for the transmission of voice and data. At predetermined intervals an on-demand data regarding location, an event, or a condition is sent by muting the voice audio and sending a data frame having a pre-determined sequence. Following the transmission of the location, event, or condition data transmission of voice and data is resumed. The communication link uses a half duplex, frequency shift, keying modulation technique.
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