Integrated data voice multiplexer supporting handshake and loop-back protocols
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United States of America Patent
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Mar 13, 1990
Issued Date -
N/A
app pub date -
Dec 23, 1988
filing date -
Jun 8, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An integrated data voice multiplexer (IDVM) capable of simultaneously supporting loop-back and communication handshake protocols with no performance degradation. This allows the IDVM to be used in both point-to-point and packet switch networks. The IDVM is of the type using frequency shift keyed FSK modulation of two or more carriers to send a data signal. The presence or absence of carrier signals indicates loop-back state. Narrowband modulation is selectively added to at least one carrier to support handshake protocol. The preferred narrowband modulation is biphase at a rate lower than the FSK modulation rate. Encoder, decoder, data hold and detect circuits for supporting standard RS232 protocol are disclosed.
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