Data communication system

Details Data communication system Data communication system

1985-06-25

1987-12-15

Griffin, Robert L.

Telecommunications

Audience survey or program distribution use accounting

455 3, 455 4, 455 53, 358 86, 34082554, H04H 104

Patent

active

047138408

ABSTRACT:
A data communication system for use in a CATV system or the like employing only simple data communications operations between a central control device and terminal units for effecting a descrambling function. The central control device is connected to the plural terminal units via respective transmission paths. When the central control device is unable to communicate with the terminal units, a transmission carrier is applied to the terminal units via the transmission paths. When a polling operation is to be carried out by the central control device, application of the carrier to the transmission paths is suspended to allow the central control device to communicate with the terminal units. In each of the terminal units, a transmission request thereto is detected from the fact that the carrier has been suspended. Upon the detection of a transmission request, an up-data transmission to the central control device is performed.

REFERENCES:
patent: 4455570 (1984-06-01), Saeki et al.
patent: 4512033 (1985-04-01), Schrock

Affiliated with

Also associated with

Rating

Data communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data communication system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1224804