Polling Method for Cable Television
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09
In a cable television system a large number of subscribers may receive service from a central unit. The central unit polls the subscribers sequentially, and a subscriber may respond with a request for a particular service. The time delay for the polling message to travel from the central unit to a subscriber plus the time for the response of the subscriber to return to the central unit are significant, in terms of the number of message bits that the central unit could transmit during such a delay. However, the central unit can transmit additional polling messages during this delay period, only if the subscribers respond to their individual polling messages in a sequence that does not cause the responses to overlap at the central unit.