Switching system equipped with line verification apparatus

Claim 2

A test trunk circuit for a communication switching system comprising: a first trunk port; a second trunk port; detector means; means for establishing a potential difference between said second trunk port and a reference terminal; and means responsive to control signals of said communication system for coupling said detector means to said first trunk port and to said reference terminal.

Claim 3

A communication switching system comprising: a plurality of test trunk circuits; and means for generating control signals at a plurality of control signal terminals; said test trunk circuits each comprising: first detection means for detecting current flow of at least a specified amplitude; second detection means for detecting current flow of at least said specified amplitude; each of said detection means comprising a current input terminal and a current output terminal; a first trunk port comprising tip and ring terminals; a second trunk port comprising tip and ring terminals; generating means for generating a potential difference between first and second terminals thereof; means including means connected to certain of said control signal terminals for connecting said first terminal of said generating means to said current input terminals of said first and second detection means, for connecting said current output terminals of said first and second detection means to said tip and ring terminals, respectively, of said first trunk port and for connecting said second terminal of said generating means to said tip and ring terminals of said second trunk port.

Claim 4

A communication switching system comprising: a plurality of test trunk circuits; and means for generating control signals at a plurality of control signal terminals; said test trunk circuits each comprising: first detection means for detecting current flow of at least a specified amplitude; second detection means for detecting current flow of at least said specified amplitude; each of said detection means comprising a current input terminal and a current output terminal; a first trunk port comprising tip and ring terminals; a second trunk port comprising tip and ring terminals; generating means for generating a potential difference between first and second terminals thereof; means including means connected to certain of said control signal terminals for connecting said first terminal of said generating means to said current input terminals of said first and second detection means, for connecting said current output terminals of said first and second detection means to said tip and ring terminals, respectively, of said first trunk port and for connecting said second terminal of said generating means to said tip and ring terminals of said second trunk port.

Claim 5

A trunk circuit for a communication switching system comprising: a plurality of control signal input terminals; a first turnk port comprising tip and ring terminals; a second trunk port comprising tip, ring, and sleeve terminals; signal detector means; first resistance means; second resistance means; and means including means connected to certain of said control signal input terminals for selectively connecting said signal detector means to said tip and ring terminals of said first trunk port and to said tip and ring terminals of said second trunk port and further including means for selectively connecting a potential source to said sleeve terminal through said first resistance means and through the combInation of said first and said second resistance means.

Claim 6

A trunk circuit for a communication switching system comprising: a plurality of control signal input terminals; a first turnk port comprising tip and ring terminals; a second trunk port comprising tip, ring, and sleeve terminals; signal detector means; first resistance means; second resistance means; and means including means connected to certain of said control signal input terminals for selectively connecting said signal detector means to said tip and ring terminals of said first trunk port and to said tip and ring terminals of said second trunk port and further including means for selectively connecting a potential source to said sleeve terminal through said first resistance means and through the combInation of said first and said second resistance means.

Claim 7

A trunk circuit for a communication switching system comprising: a first trunk port comprising tip and ring terminals; a seocnd trunk port comprising tip, ring, and sleeve terminals; a first polar relay having first and second terminals; a second polar relay having first and second terminals; resistance means; a signal generator for generating a potential between first and second terminals thereof; means for connecting said first terminals of said first and second polar relays to said tip and ring terminals, respectively, of said first trunk port; means for connecting said second terminals of said first and second polar relays to said first terminal of said signal generator; means for connecting said second terminal of said signal generator to said tip and ring terminals of said second trunk port; and means for connecting a potential source through said resistance means to said sleeve terminal of said second trunk port.

Claim 8

A trunk circuit for a communication switching system comprising: a first trunk port comprising tip and ring terminals; a seocnd trunk port comprising tip, ring, and sleeve terminals; a first polar relay having first and second terminals; a second polar relay having first and second terminals; resistance means; a signal generator for generating a potential between first and second terminals thereof; means for connecting said first terminals of said first and second polar relays to said tip and ring terminals, respectively, of said first trunk port; means for connecting said second terminals of said first and second polar relays to said first terminal of said signal generator; means for connecting said second terminal of said signal generator to said tip and ring terminals of said second trunk port; and means for connecting a potential source through said resistance means to said sleeve terminal of said second trunk port.

Claim 9

A communication switching system comprising: a plurality of line circuits; a plurality of trunk circuits; a switching network connected to said line circuits and said trunk circuits for selective interconnection thereof under the control of network command signals; scanning means under the control of scanner command signals for generating output signals defining the states of sensing elements connected thereto; a control arrangement comprising means for generating said network command signals, means for generating said scanner command signals and means for generating control signals; said trunk circuits each comprise a plurality of sensing circuits connected to said scanning means and a plurality of control elements connected to said control arrangement and responsive to said control signal, the states of said control elements of a trunk circuit in combination defining a plurality of different transmission and control configuration states of said trunk circuit, the control arrangement being responsive to said output signals of said scanning means for selectively controlling the control elements of said trunk circuits and for controlling said switching network; and at least one of said trunk circuits comprises a test trunk circuit comprising: a first trunk port connected to said switching network, a second trunk port for connection to a test trunk of another switching system, detector means and certain configuration states of said test trunk circuit serve to selectively couple said detector means to said first trunk port and to said second trunk port.

Claim 10

A communication switching system comprising: a plurality of line circuits; a plurality of trunk circuits; a switching network connected to said line circuits and said trunk circuits for selective interconnection thereof under the control of network command signals; scanning means under the control of scanner command signals for generating output signals defining the states of sensing elements connected thereto; a control arrangement comprising means for generating said network command signals, means for generating said scanner command signals and means for generating control signals; said trunk circuits each comprise a plurality of sensing circuits connected to said scanning means and a plurality of control elements connected to said control arrangement and responsive to said control signal, the states of said control elements of a trunk circuit in combination defining a plurality of different transmission and control configuration states of said trunk circuit, the control arrangement being responsive to said output signals of said scanning means for selectively controlling the control elements of said trunk circuits and for controlling said switching network; and at least one of said trunk circuits comprises a test trunk circuit comprising: a first trunk port connected to said switching network, a second trunk port for connection to a test trunk of another switching system, detector means and certain configuration states of said test trunk circuit serve to selectively couple said detector means to said first trunk port and to said second trunk port.

Claim 11

A communication switching system in accordance with claim 5 wherein said test trunk circuit further comprises a source of potential comprising first and second output terminals and one configuration state of said test trunk circuit serves to couple said first output terminal of said potential source to said second trunk port and to couple said detector means to said first trunk port and to said second output terminal of said source of potential.