Polling pattern generator for CATV system
First Claim
1. In a polling pattern generator for a CATV system having a single center and a number of terminal units connected to said single center for transmitting television programs through cables to said terminal units, the improvement comprising:
- means for providing polling pattern signals, each said polling pattern signal having a specific address code for calling a corresponding terminal unit and a command code for requesting a designated answer from the called terminal unit, at least one said polling pattern signal being periodically transmitted at a predetermined interval, whereupon said terminal unit is called in response to said address code and a designated answer is provided from said terminal unit in response to said command code of said polling pattern signal.
1 Assignment
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Accused Products
Abstract
A polling pattern generator system for use in a CATV system including a polling pattern generator and a passive data monitor. The polling pattern generator periodically generates polling pattern signals each of which has a specific address code for calling a corresponding terminal unit and a command code for requesting a designated answer from the called terminal unit. The passive data monitor compares an up data signal outputted from the terminal unit in response to the command code with the designated answer requested by the command code and judges whether or not an operational state of the terminal unit is acceptable from the resultant comparison output. The passive data monitor sets the address code in the designated terminal unit.
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Citations
4 Claims
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1. In a polling pattern generator for a CATV system having a single center and a number of terminal units connected to said single center for transmitting television programs through cables to said terminal units, the improvement comprising:
- means for providing polling pattern signals, each said polling pattern signal having a specific address code for calling a corresponding terminal unit and a command code for requesting a designated answer from the called terminal unit, at least one said polling pattern signal being periodically transmitted at a predetermined interval, whereupon said terminal unit is called in response to said address code and a designated answer is provided from said terminal unit in response to said command code of said polling pattern signal.
- View Dependent Claims (2, 3, 4)
Specification