Method and apparatus for confirming transmission in bidirectiona

Details Method and apparatus for confirming transmission in bidirectiona Method and apparatus for confirming transmission in bidirectiona

1977-04-14

1979-05-29

Griffin, Robert L.

325 31, 325 30, H04B 100

Patent

active

041568478

ABSTRACT:
In a bidirectional CATV system, in which interrogations and commands to terminals for individual subscribers occur at high speed, the status of individual terminals is checked rapidly and reliably without interfering with other transmissions. In response to diagnostic commands from the head end unit, the terminal responds with a message that is unlike the usual transmission, and identifies the status established in response to prior commands. The head end unit is thereby without delay able to ascertain not only that the prior commands were correctly transmitted and received but that the appropriate actions were taken in response thereto.

REFERENCES:
patent: 3757225 (1973-09-01), Ulicki
patent: 3790700 (1974-02-01), Callais et al.
patent: 3794922 (1974-02-01), Osborn
patent: 3803491 (1974-04-01), Osborn
patent: 3806814 (1974-04-01), Forrbes
patent: 3944742 (1976-03-01), Cunningham
patent: 3987397 (1976-10-01), Belcher et al.
patent: 4044376 (1977-08-01), Porter

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