H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/3
H04M 11/00 (2006.01)
Patent
CA 1229688
-21- ABSTRACT OF THE DISCLOSURE A method for effecting the communication of digital signals over telephone lines includes the steps of generating a voltage at a first level for providing an inactive state signal directed to a plurality of slave transceiver units and generating a voltage at a second level for providing a first carrier detect signal directed to the slave units. A digitally encoded first data signal is then generated, has a peak amplitude at a third voltage level and is also directed to the slave units. In response to the first carrier detect and first data signals, a voltage will be generated at a fourth level for providing a second carrier detect signal directed to a master transceiver unit. Thereupon, a digitally encoded second data signal will be generated to have a peak amplitude at a fifth voltage level and is also directed to the master transceiver unit. An active bridge apparatus for effecting the communication of digital signals over telephone lines includes an isolated input circuit adapted to be coupled to a master transceiver unit by a single, twisted first pair telephone line. First means are included for transmitting an inactive state signal at a first voltage level to a plurality of slave transceiver units, each of which is adapted to be coupled to the bridge apparatus by a single, twisted pair telephone line. The apparatus also includes second means for transmitting particularly identifiable signals at disclosed voltage levels to effect both control and communications.
476855
Kucharski Paul G.
Pascucci Gregory A.
Johnson Service Company
Kirby Eades Gale Baker
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