Mobile data terminal channel busy arrangement

Details Mobile data terminal channel busy arrangement Mobile data terminal channel busy arrangement

H - Electricity

04

B

325/16

H04B 1/38 (2006.01) H03G 3/00 (2006.01) H04L 1/20 (2006.01) H04L 7/04 (2006.01)

Patent

CA 1181815

MOBILE DATA TERMINAL CHANNEL BUSY ARRANGEMENT ABSTRACT OF THE DISCLOSURE A channel busy arrangement for use in a radio-based data transmission system comprising a plurality of data terminals. A carrier activity signal (CAS) generated by a receiver associated with a data terminal is used to trigger a CAS pulse of approximately 300 msec. A demodulated audio signal from the receiver is coupled to a SYNC detector for detecting a data synchronizing (SYNC) signal generally transmitted before a data message and to an optional continuous tone coded squelch system (CTCSS) for generating a CTCSS signal. The CAS pulse, SYNC signal and CTCSS signal are logic ORed to generate a channel busy signal used for inhibiting data transmission. Thus, data transmission is inhibited only during a 300 msec CAS pulse, when a SYNC signal is present, or during valid non-data transmissions (voice) even in the presence of an interfering signal.

402530

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