Integrated data voice multiplexer supporting handshake and loop-

Details Integrated data voice multiplexer supporting handshake and loop- Integrated data voice multiplexer supporting handshake and loop-

1988-12-23

1990-03-13

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 11, 370 76, H04J 314

Patent

active

049088190

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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"Integrated Data Voice Carrier", Seiscor Technologies, Jan. 1985, IDVC Technical Manual, p. 10.

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