CATV telephony system using subsplit band for both directions of

Details CATV telephony system using subsplit band for both directions of CATV telephony system using subsplit band for both directions of

1994-06-14

1996-01-30

Groody, James J.

Television

Two-way video and voice communication

User positioning

348 12, 348 10, 455 51, 455 63, H04N 7173

Patent

active

054884136

ABSTRACT:
A cable television (CATV) system is modified to provide two-way telephone communications in a subsplit band below the video signal, preferrably in the range of approximately 5-40 MHz. Each line amplifier in the coaxial cable network is equipped with a bypass strap or bypass circuitry to maintain a signal path through the line amplifier for the telephone signal in the event of failure of the line amplifier. Due to the decreased attentuation resulting from its lower frequency, the telephone signal can typically travel the distance of three or four line amplifier spacings without amplification. Line amplifier failure is a common occurrence in CATV networks. Therefore, the present invention greatly increases the reliability of telephone communications over CATV networks.

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