Telephone interconnect detection system
First Claim
1. A system for selectively determining, during operation, interconnect of a plurality of first telephone lines with a plurality of second telephone lines interconnected by a switching device, one of said plurality of first or second lines being telephone system trunk lines and the other being telephone set lines, and said switching device being a pbx or the like, said system comprising:
- means for selecting in sequential order ones of said first lines according to a predetermined logic, and generating operation signals;
a pulse generator for generating a sensing pulse within the audio bandwidth of said switching device;
means for selectively applying one of said sensing pulses to one of said selected first lines in response to said operation signals for transmission of said one sensing pulse through said switching device;
a selectively operable first filter connected to said first lines, said first filter being operable in response to said operation signals to attenuate said sensing pulse for inhibiting outbound transmission of said sensing pulse over said first lines;
a detector connected to said second lines for detecting the presence of said sensing pulse on any one or more of said second lines, and identifying said one or more second lines; and
a selectively operable second filter connected to said second lines, said second filter being operable in response to said operation signals to attenuate said sensing pulse for inhibiting outbound transmission of said sensing pulse over said second lines.
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Accused Products
Abstract
A telephone interconnect detection system for selectively determining, during operation, interconnection of a plurality of trunk lines with a plurality of set lines interconnected by a pbx or the like. The system includes a processor for selecting in sequential order ones of the trunk lines according to a predetermined logic, and generating trunk and set operation control signals; a pulse generator for generating a limited bandwidth and duration sensing pulse within the audio bandwidth of the pbx; a multiplexer for selectively applying one of the sensing pulses to one or more selected trunk lines for transmission of the pulse through the pbx; a selectively operable band-reject filter connected to the trunk lines and tuned to the frequency of the sensing pulse, the filter operating in response to the trunk operation signal to attenuate the pulse for inhibiting its outbound transmission over the trunk lines; a detector connected to the set lines for detecting the presence of the sensing pulse on any one or more of the set lines, and identifying those one or more set lines; and a selectively operable second band-reject filter connected to the set lines and tuned to the frequency of the sensing pulse, the filter operating in response to the set operation signal to attenuate the sensing pulse for inhibiting its outbound transmission over the set lines. The first and second filters include a plurality of individual two stage filters, one filter being connected to each of the trunk and set lines.
29 Citations
20 Claims
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1. A system for selectively determining, during operation, interconnect of a plurality of first telephone lines with a plurality of second telephone lines interconnected by a switching device, one of said plurality of first or second lines being telephone system trunk lines and the other being telephone set lines, and said switching device being a pbx or the like, said system comprising:
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means for selecting in sequential order ones of said first lines according to a predetermined logic, and generating operation signals; a pulse generator for generating a sensing pulse within the audio bandwidth of said switching device; means for selectively applying one of said sensing pulses to one of said selected first lines in response to said operation signals for transmission of said one sensing pulse through said switching device; a selectively operable first filter connected to said first lines, said first filter being operable in response to said operation signals to attenuate said sensing pulse for inhibiting outbound transmission of said sensing pulse over said first lines; a detector connected to said second lines for detecting the presence of said sensing pulse on any one or more of said second lines, and identifying said one or more second lines; and a selectively operable second filter connected to said second lines, said second filter being operable in response to said operation signals to attenuate said sensing pulse for inhibiting outbound transmission of said sensing pulse over said second lines. - View Dependent Claims (2, 3, 4, 5)
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6. A system for selectively determining, during operation, interconnect patterns of a plurality of first telephone lines with a plurality of second telephone lines interconnected by a switching device, one of said plurality of first or second lines being telephone system trunk lines and the other being telephone set lines, and said switching device being a pbx or the like, said system comprising:
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means for selecting at least one line of said plurality of first lines according to a predetermined logic; means for generating a limited duration sensing signal having a frequency within the audio bandwidth of said switching device; means for selectively applying said sensing signal to said selected first line; means for inhibiting outbound transmission of said sensing signal over said selected first line, whereby said sensing signal will be transmitted through said switching device to one or more of said plurality of second lines connected to said selected first line by said switching device, but will go substantially undetected by a user with a telephone set connected to said selected first line; means for detecting the presence of said sensing signal on any of said plurality of second lines, and indicating said one or more second lines whereon said sensing signal is detected, whereby the interconnect pattern of said selected first line with said one or more second lines existing during the duration of said sensing signal is determined; and means for inhibiting outbound transmission of said sensing signal over said one or more second lines, whereby said sensing signal will go substantially undetected by a user with a telephone set connected to one of said one or more second lines. - View Dependent Claims (7, 8, 9, 10)
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11. A system for selectively determining, during operation, interconnect of a plurality of first telephone lines with a plurality of second telephone lines interconnected by a switching device, one of said plurality of first or second lines being telephone system trunk lines and the other being telephone set lines, and said switching device being a pbx or the like, said system comprising:
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a processor for selecting in sequential order ones of said first lines according to a predetermined logic, and generating operation signals; a pulse generator for generating a limited bandwidth and duration sensing pulse within the audio bandwidth of said switching device and applying one of said sensing pulses to one or more of said selected first lines in response to said operation signals for transmission of said one sensing pulse through said switching device; a selectively operable first filter connected to said first lines, said first filter being operable in response to said operation signals to attenuate said sensing pulse for inhibiting outbound transmission of said sensing pulse over said first lines; a detector connected to said second lines for detecting the presence of said sensing pulse on any one or more of said second lines, and identifying said one or more second lines; and a selectively operable second filter connected to said second lines, said second filter being operable in response to said operation signals to attenuate said sensing pulse for inhibiting outbound transmission of said sensing pulse over said second lines. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification