Method and apparatus for polling subscriber terminals

Details Method and apparatus for polling subscriber terminals Method and apparatus for polling subscriber terminals

1985-12-26

1987-08-25

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

370 85, 370 90, 358 84, 358 86, G08B 500, H04N 700, H04J 316

Patent

active

046896198

ABSTRACT:
Subscriber terminals serviced by a plurality of remotely located two-way addressable cable television systems are polled using polling command signals addressed to the different terminals from a polling center. The polling command signals are sent to the subscriber terminals via their associated headends. Responses from the polled subscriber terminals are successively received at the polling center. The round trip signal propagation times required to communicate the polling command and response signals to and from each of the headends is equalized so that the response from the polled subscriber terminals are received in the same order in which the terminals are addressed by the polling command signals. A uniform delay is inserted after each successive polling command signal to allow for variations in the signal propagation times between the headends and individual subscriber terminals coupled thereto.

REFERENCES:
patent: 4149144 (1979-04-01), Diefenderfer
patent: 4332027 (1982-05-01), Malcolm et al.
patent: 4361903 (1982-11-01), Ohta
patent: 4595921 (1986-06-01), Wang et al.
Integrated Electronics: Analog and Digital Circuits and Systems, Jacob Millman, Christos C. Halkias, 1972, p. 635.

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