Multichannel telephone system
First Claim
Patent Images
1. In a multi-channel telephone system having:
- (A) a plurality of telephones, each of said telephones having a transceiver unit;
(B) a plurality of user channels; and
(C) a key service unit having a plurality of user channel transceivers for interfacing between said plurality of telephones and a primary communications link via said user channels;
an improvement comprising;
(A) channel monitor means for frequently monitoring said plurality of user channels for energy, for determining availability of said user channels based upon such monitoring, and for providing an output related to the availabilty of said user channels; and
(B) channel status list means for receiving said output from said channel monitor means and for maintaining a list relating to availabilty of said user channels.
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Accused Products
Abstract
A multi-channel RF telephone system that utilizes a dedicated channel status monitor to develop a list of available communications channels, and a common channel transceiver to transmit this list to the telephones. The telephones select a channel to use from this list by sequentially accessing the list a number of times based upon, at least in part, an identification number uniquely assigned to the telephone in question. If the selected channel is in fact unavailable, the telephone can update the list it maintains independently.
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Citations
43 Claims
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1. In a multi-channel telephone system having:
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(A) a plurality of telephones, each of said telephones having a transceiver unit; (B) a plurality of user channels; and (C) a key service unit having a plurality of user channel transceivers for interfacing between said plurality of telephones and a primary communications link via said user channels; an improvement comprising; (A) channel monitor means for frequently monitoring said plurality of user channels for energy, for determining availability of said user channels based upon such monitoring, and for providing an output related to the availabilty of said user channels; and (B) channel status list means for receiving said output from said channel monitor means and for maintaining a list relating to availabilty of said user channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In a multi-channel telephone system having:
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(A) a plurality of telephones, each of said telephones having a transceiver unit; (B) a plurality of user channels; and (C) a key service unit having a plurality of user channel transceivers for interfacing between said plurality of telephones and a primary communications link via said user channels; an improvement comprising; (A) channel monitor means for determining availabilty of said user channels for use in interfacing between said plurality of telephones and said primary communications link; and (B) common channel transceiver means for occasionally transmitting information regarding availability of said user channels to said plurality of telephones. - View Dependent Claims (16, 17, 18, 19, 20)
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21. In a multi-channel telephone system having:
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(A) a plurality of telephones, each of said telephones having a transceiver unit; (B) a plurality of user channels; and (C) a key service unit having a plurality of user channel transceivers for interfacing between said plurality of telephones and a primary communications link via said user channels; an improvement comprising; (A) means for providing said telephones with a channel status list comprising a list of user channels that appear to be available for use in interfacing said telephones with said primary communications link; (B) means for providing each of said telephones in said system with an identification number unique to each telephone within said system; and (C) providing communications link establishment means for selecting a user channel from said channel status list to be used for attempting to establish an interface between one of said telephones and said primary communication link, said communications link establishment means operating to initially select one of said user channels based, at least in part, upon the identification number for that telephone. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. In a multi-channel telephone system having:
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(A) a plurality of user channels, at least some of said user channels comprising radio frequency links having preselected frequencies; (B) a plurality of telephones, each of said telephones having a transceiver unit capable of transmitting and receiving information over at least one of said user channels; and (C) a key service unit having a plurality of user channel transceivers capable of transmitting and receiving information over at least one of said user channels for interfacing between at least one of said plurality of telephones and a primary communications link via one of said user channels; an improvement comprising; (A) channel monitor means incapable of transmitting information over said user channels for frequently monitoring said plurality of user channels for energy, for determining availability of said user channels based upon such monitoring, and for providing an output related to the availabilty of said user channels; and (B) channel status list means for receiving said output from said channel monitor means and for maintaining a list relating to availabilty of said user channels. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification