US3624305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication switching network hold and extra control conductor usage
Assignee: AG Communication Systems Corp
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Filing: 1970-07-13
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Granted: 1971-11-30
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Expires: 1990-07-13
Abstract
Abstract A common control switching system with a network having a main section for line to line and trunk connections and an auxiliary portion for register and sender connections. The terminal stage of the network has a multiple to both the originating and terminating sides of the main portion and to the auxiliary portion. For outgoing calls the connections are set up with the calling line having a double connection to the register and to the originating side of the main network, and the trunk circuit is set up with a double connection to the sender and to the terminating side of the network. In the auxiliary portion, diodes are provided in the hold conductor at the inlet side of each 1XN switch to permit the register and sender connections to be initially held by ground potential from the register and sender circuits respectively and subsequently released, while ground on the hold conductor in the main portion of the network holds that connection. The terminating junctors in the main portion of the network provide for call supervision for a local mode with a transmission bridge, and a trunk mode and a test mode with metallic switch through. The test mode operates a test-call relay for splitting the hold conductor between the originating and terminating parts of the network, and an extra control conductor through the originating section is connected via make contacts of the testcall relay and the hold conductor of the terminating section to the cutoff relay of a line circuit, to thereby permit making a busy test for test and verification calls, and also to control the cutoff relay for tests from a common test set.
Inventors
- 👤 George Verbaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:05
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
620 words
A communication switching system comprising: a plurality of communication lines, some of which are trunk lines for outgoing calls; a plurality of registers and a plurality of senders, a switching network having a main portion for selectively interconnecting said lines, and an auxiliary portion for selectively connecting lines to registers and trunk lines to senders, said network including a plurality of switching devices to switch in each connection a set of conductors including transmission path conductor means and a hold conductor, each of said lines having a network terminal circuit coNnected to a multiple to both portions of the network, each of said trunk lines also having a circuit with hold control means to apply holding potential to the hold conductor of its terminal multiple, each register and sender including hold control means to apply holding potential to the hold conductor, wherein each switching device comprises a single inlet and a plurality of outlets, contact means for connecting the transmission and hold conductors of the inlet to a selected outlet, setting means to operate the contact means to connect the inlet to a selected outlet, and hold means connected to the hold conductor of the inlet to hold the contact means after operation thereof, the auxiliary portion of the network having at least a terminal stage with the outlets of each of its switching devices connected to the multiples of individual terminals, and each of the switching devices of the auxiliary portion having a diode connected in series in the hold conductor between the connection to its holding means and said contact means, the diode being poled to prevent hold potential on the hold conductor of a terminal multiple from holding the switching devices of the auxiliary portion, while permitting hold potential from the auxiliary portion to extend to the hold conductor of the terminal multiple, a plurality of junctors in the main portion of the network, having switch-through relay means with a split condition in which the transmission conductor means is open, and a switchedthrough condition in which the transmission conductor means is metallically connected through the junctor, the hold conductor being connected through under both conditions; network control means (marker 102) to supply operating potentials to said network-switching devices, and instructions to said junctors; central processing apparatus for processing calls to establish network connections, including means to cause the network control means to supply operating potentials to establish a connection in said auxiliary portion from a calling one of said lines to a register, and to instruct said register to operate its hold control means to hold the connection; means subsequently effective to cause the network control means to supply operating potentials to establish a connection in said auxiliary portion from a sender to one of said trunk line terminal circuits, and to instruct said sender to operate its hold control means to hold the connection, and means to cause the network control means to supply operating potentials to establish a connection in said main portion from said calling line via one of said junctors to said trunk line terminal circuit, with the junctor in said split condition, the hold control means of the trunk being operated to hold the connection in the main portion; and means subsequently effective to instruct said register and said sender to each release their hold control means to thereby remove the hold potentials from the respective hold conductors to release the respective register and sender connections in the auxiliary portion, said diodes being effective to prevent the hold potential from the trunk line terminal from holding these auxiliary portion connections, and means to cause the network control means to instruct said junctor to change from the split condition to the switched-through condition.
Claim 2
Dependent Claim
620 words
A communication switching system comprising: a plurality of communication lines, some of which are trunk lines for outgoing calls; a plurality of registers and a plurality of senders, a switching network having a main portion for selectively interconnecting said lines, and an auxiliary portion for selectively connecting lines to registers and trunk lines to senders, said network including a plurality of switching devices to switch in each connection a set of conductors including transmission path conductor means and a hold conductor, each of said lines having a network terminal circuit coNnected to a multiple to both portions of the network, each of said trunk lines also having a circuit with hold control means to apply holding potential to the hold conductor of its terminal multiple, each register and sender including hold control means to apply holding potential to the hold conductor, wherein each switching device comprises a single inlet and a plurality of outlets, contact means for connecting the transmission and hold conductors of the inlet to a selected outlet, setting means to operate the contact means to connect the inlet to a selected outlet, and hold means connected to the hold conductor of the inlet to hold the contact means after operation thereof, the auxiliary portion of the network having at least a terminal stage with the outlets of each of its switching devices connected to the multiples of individual terminals, and each of the switching devices of the auxiliary portion having a diode connected in series in the hold conductor between the connection to its holding means and said contact means, the diode being poled to prevent hold potential on the hold conductor of a terminal multiple from holding the switching devices of the auxiliary portion, while permitting hold potential from the auxiliary portion to extend to the hold conductor of the terminal multiple, a plurality of junctors in the main portion of the network, having switch-through relay means with a split condition in which the transmission conductor means is open, and a switchedthrough condition in which the transmission conductor means is metallically connected through the junctor, the hold conductor being connected through under both conditions; network control means (marker 102) to supply operating potentials to said network-switching devices, and instructions to said junctors; central processing apparatus for processing calls to establish network connections, including means to cause the network control means to supply operating potentials to establish a connection in said auxiliary portion from a calling one of said lines to a register, and to instruct said register to operate its hold control means to hold the connection; means subsequently effective to cause the network control means to supply operating potentials to establish a connection in said auxiliary portion from a sender to one of said trunk line terminal circuits, and to instruct said sender to operate its hold control means to hold the connection, and means to cause the network control means to supply operating potentials to establish a connection in said main portion from said calling line via one of said junctors to said trunk line terminal circuit, with the junctor in said split condition, the hold control means of the trunk being operated to hold the connection in the main portion; and means subsequently effective to instruct said register and said sender to each release their hold control means to thereby remove the hold potentials from the respective hold conductors to release the respective register and sender connections in the auxiliary portion, said diodes being effective to prevent the hold potential from the trunk line terminal from holding these auxiliary portion connections, and means to cause the network control means to instruct said junctor to change from the split condition to the switched-through condition.
Claim 3
Dependent Claim
54 words
A communication switching system as claimed in claim 1, wherein each said network terminal circuit includes a cutoff relay connected to the hold conductor of its said multiple, and wherein hold potential on the hold conductor from either the auxiliary portion or the main portion of the network operates and holds the cutoff relay.
Claim 4
Dependent Claim
238 words
A communication switching system as claimed in claim 2, wherein said junctors in the main portion of the network are terminating junctors, each having local-call circuits including a transmission bridge and ringing control circuits, the local-call circuits having calling side and called side connections to said transmission path condUctor means; a reversing relay (AP) for reversing the calling and called side connections of the local call circuits; a trunk-call relay (TK) for disconnecting the local call circuits from the transmission path conductors; wherein the initial instructions to the junctor for said connection through the main portion of the network to said trunk line terminal circuit includes an instruction which operates the trunk-call relay to thereby establish said split condition, and said means to cause the network control means to instruct said junctor to change from the split condition to the switched-through condition comprises instructions to operate said reversing relay, the switched-through condition path for the transmission path conductor means comprising a metallic path through contacts of the trunk-call relay and the reversing relay; wherein the trunk call relay is held via a connection through its own contacts to the hold conductor, and the reversing relay is held via contacts of the trunk-call relay on said call to a trunk line terminal circuit, the reversing relay when used on a call terminating to a local line terminal circuit being held via contacts of a relay of the local-call circuits.
Claim 5
Dependent Claim
76 words
A communication switching system as claimed in claim 3, wherein said main portion of the network includes an extra control conductor extending through the switching devices and junctors for calls to said trunk line terminal circuits, and wherein there are contacts on said trunk-call relay to split the extra control conductor for the split mode, and there are contacts on the reversing relay to complete a path via the extra control conductor in the switched-through condition.
Claim 6
Dependent Claim
109 words
A communication switching system as claimed in claim 4, wherein at least one of said junctors further include apparatus for a test mode, including a test-call relay; wherein said local-call circuits include a party relay for controlling the side of line of ringing, and instructions for the test mode from said network control means operate the trunk-call relay and the party relay, said test-call relay being operated via contacts of the party and trunk-call relays, and locking via its own contacts and contacts of the trunk-call relay; contacts of the test-call relay being used to control connections of the extra control and hold conductors for the test call mode.
Claim 7
Dependent Claim
134 words
A call-supervisory junctor for use in a communication switching system having a switching network with the junctor included between a first and a second section of the switching network, each section being arranged to switch transmission conductors and a hold conductor connected to holding means for the switches in each section, the first section being also arranged to switch an extra-control conductor; said junctor being equipped to provide service for both normal calls and test calls; the improvement in said junctor comprising test-call mode means effective during a test call to split the hold conductor and to connect the extra-control conductor from the first section to the hold conductor of the second section, with the holding means for the switches in the second section remaining connected to the hold conductor of the first section.
Claim 8
Dependent Claim
134 words
A call-supervisory junctor for use in a communication switching system having a switching network with the junctor included between a first and a second section of the switching network, each section being arranged to switch transmission conductors and a hold conductor connected to holding means for the switches in each section, the first section being also arranged to switch an extra-control conductor; said junctor being equipped to provide service for both normal calls and test calls; the improvement in said junctor comprising test-call mode means effective during a test call to split the hold conductor and to connect the extra-control conductor from the first section to the hold conductor of the second section, with the holding means for the switches in the second section remaining connected to the hold conductor of the first section.
Claim 9
Dependent Claim
164 words
A call-supervisory junctor as claimed in claim 6, wherein said communication switching system in which it is used includes network control means (marker 102) for controlling the operation of the switching network and for supplying junctor instructions, the junctor having a plurality of modes and conditions of operation which are set in accordance with the instructions, means to apply hold potential to the hold conductor in the junctor during receipt of instructions; wherein said test-call mode means includes a test-call relay which is operated in response to test-call instructions from the network control means, the test-call relay having a set of break contacts in said hold conductor between the first section and the second section, the holding means for the switches in The second section being permanently connected to the hold conductor of the first section, and the test-call relay having a set of make contacts for connecting the extra control conductor from the first section to the hold conductor of the second section.
Claim 10
Dependent Claim
77 words
A call-supervisory junctor as claimed in claim 7, wherein one of said modes is a trunk call-mode, and wherein the junctor includes trunk-call relay means which in response to trunk-call instructions from the network control means provides a metallic path for the transmission conductors between said first and second sections of the switching network, and wherein said test-call instructions include instructions for operation of the trunk-call relay means as well as for operation of the test-call relay.
Claim 11
Dependent Claim
93 words
A call-supervisory junctor as claimed in claim 8, wherein said modes further include a local-call mode, wherein the junctor includes local-call circuits including at least one relay which may be operated for said local call conditions by instructions from the network control means, and wherein the instructions for the test-call mode includes instructions for operating the trunk-call relay means and said one relay of the local-call circuits, the test-call relay being operated via contacts of the trunk-call relay means and said one local-call relay and locked via contacts of the trunk-call relay means.
Claim 12
Dependent Claim
175 words
The combination as claimed in claim 7, wherein said communication switching system includes a plurality of network terminal circuits including local line circuits having appearances on both the first and second sections of the network, each local line circuit including a cutoff relay connected to the hold conductor for operation in response to a hold potential thereon; wherein for normal calls terminating at a local line circuit said junctor places holding potential on the hold conductor of the first section which holds the switches of both the first and second sections and the cutoff relays of the line circuits connected to each section of the network; wherein some of the said network terminal circuits are test-mode terminal circuits having detection means connected to said extra control conductor which via the connection through the first section of the network and the contacts of the test-call relay of the junctor to the hold conductor of the second section detects the presence of hold potential at a local line circuit to which a test-mode call has been established.
Claim 13
Dependent Claim
103 words
The combination as claimed in claim 10, wherein one of said test-mode terminal circuits is connected to a test trunk for connection to a test set which includes means to supply holding potential to the extra control conductor, which via the connection through the junctor to the hold conductor to a local line circuit connected to the second section operates the cutoff relay, the local line circuits including a line relay which is normally connected to the transmission conductors through break contacts of the cutoff relay so that the line relay is disconnected from the transmission conductors upon operation of the cutoff relay.
Claim 14
Dependent Claim
164 words
The combination as claimed in claim 11, wherein said test trunk includes a hold relay and a connection-detect relay, each having a winding and a plurality of contacts, the winding of the connection-detect relay being connected between the source of potential on one side and on the other side via break contacts to the hold relay to the hold conductor, the winding of the hold relay being connected in a series path from a source of hold potential via a release key on the one side, and on the other side via a set of its own make contacts to the hold conductor, the last set of contacts being shunted by a set of make contacts of the connection-detect relay, so that when a connection from the test-mode terminal circuit is completed the hold potential from the junctor operates the connection-detect relay, which competes a path for operation of the hold relay, and upon operation of the hold relay the connection-Detect relay is disconnected.
Claim 15
Dependent Claim
101 words
The combination as claimed in claim 10, wherein one of said test-mode terminal circuits is connected to a verification circuit, which includes a hold relay having a winding connected directly to the hold conductor for operation upon establishment of a connection, the hold conductor being also connected via contacts of he hold relay and other relays to holding potential; and wherein the extra control conductor from the terminal circuit is connected via contacts of the hold relay and other relays to said detection means, providing a busy test for a local line circuit to which a test-mode connection has been established.
References Cited (Backward Citations)
US3487173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |