US3560663A
Expired / Lapsed
US
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Traffic control for modifying the routing plan in a network of switching centers
Assignee: Automatic Electric Laboratories Inc
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Filing: 1969-01-30
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Granted: 1971-02-02
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Expires: 1989-01-30
Abstract
Abstract A communications network is disclosed wherein the code translation and routing apparatus at each switching center includes a memory having a number of code words and a number of routing words. Each code word stores a code which usually comprises three or six digits used in an associative search by comparison with the corresponding dialed digits. Each code word or group of code words is followed by one or three routing words, each of which designates one or more trunk groups, which may comprise a primary route and a number of alternate routes. Some of the code words include an automatic traffic control digit which directs which one of three routing words is to be used. The value of the traffic digit for each code or group of codes may be modified by a traffic controller by a call from a special station, to thereby designate which one of three predetermined routing plans stored in the respective routing words is to be used. Thus under abnormal traffic conditions caused, for example, by overloads in emergencies, or destruction of facilities, the traffic routing plan may be modified.
Inventors
- 👤 David K K Lee
- 👤 Don N Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:26
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54; H04Q3/545
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
264 words
In a communication switching system having a plurality of terminations, and a switching network for selectively connecting a calling termination to one of the others in accordance with a call-directive code comprising digits of signals received via the calling termination; translation and routing means including a plurality of code translation stores (DPI2 and DPI22-DPI21 words, FIGS. 5 and 6), each individual to a call directive code, a plurality of route selection control stores (DPI3, DPI24 and DPI25 words) which store information effectively designating terminations and an order of perference thereof, means associating code translation stores with route selection control stores, means to receive digits of a call directive code, means using said received digits to select the corresponding code translation store, means to select an associated route selection control store, means to select a termination in accordance with the information from the route selection control store, and means to supply the identity of the selected termination to equipment which operates the switching network to connect the calling and selected terminations; wherein at least some of said code translation stores include storage devices storing a traffic plan digit (ATC in DPI21 words) having a plurality of possible values, with the terminations designated and their order of preference for the code being according to one of a plurality of predetermined plans in respective route selection control stores, one of which is selected dependent on the value of said traffic plan digit; and traffic plan control means to selectively modify the respective values of the traffic plan digits of at least some of the code translation stores.
Claim 2
Dependent Claim
264 words
In a communication switching system having a plurality of terminations, and a switching network for selectively connecting a calling termination to one of the others in accordance with a call-directive code comprising digits of signals received via the calling termination; translation and routing means including a plurality of code translation stores (DPI2 and DPI22-DPI21 words, FIGS. 5 and 6), each individual to a call directive code, a plurality of route selection control stores (DPI3, DPI24 and DPI25 words) which store information effectively designating terminations and an order of perference thereof, means associating code translation stores with route selection control stores, means to receive digits of a call directive code, means using said received digits to select the corresponding code translation store, means to select an associated route selection control store, means to select a termination in accordance with the information from the route selection control store, and means to supply the identity of the selected termination to equipment which operates the switching network to connect the calling and selected terminations; wherein at least some of said code translation stores include storage devices storing a traffic plan digit (ATC in DPI21 words) having a plurality of possible values, with the terminations designated and their order of preference for the code being according to one of a plurality of predetermined plans in respective route selection control stores, one of which is selected dependent on the value of said traffic plan digit; and traffic plan control means to selectively modify the respective values of the traffic plan digits of at least some of the code translation stores.
Claim 3
Dependent Claim
90 words
In a communication switching system, the combination as claimed in claim 1, wherein said traffic plan control means includes a traffic control station, means to supply digital information from the traffic control station to said translation and routing means, and traffic plan control apparatus in the translation and routing means to analyze the digital information from the traffic control station to identify a code translation store and a traffic plan digital value, and to modify the value of the traffic plan digit in said code translation store to that value.
Claim 4
Dependent Claim
88 words
In a communication switching system, the combination as claimed in claim 2, wherein said code translation stores are organized into sets, each comprising one or more of the code translation stores, each said set being associated with at least one of the said route translation stores, some of the sets being associated with a plurality of the route selection control stores, wherein different possible values of the traffic plan digit of each code translation store of the set identify different ones of the associated route selection control stores.
Claim 5
Dependent Claim
64 words
In a communication switching system, the combination as claimed in claim 3, wherein the traffic plan control apparatus of the translation and routing means is arranged to modify the value of the traffic plan digit of only one code translation store, or alternatively of all of the code translation stores of a set, depending on the digital information received from the traffic control station.
Claim 6
Dependent Claim
97 words
In a communication switching system, the combination as claimed in claim 4, wherein one of said terminations is a traffic control termination, wherein said traffic control station is connected to the last said termination, and wherein the digital call information for calls from the traffic control station via its termination is received in the translation and routing means in the same manner as for normal calls via other terminations, the translation and routing means including means to recognize a special class of service for the traffic control termination to permit actuation of the traffic plan control apparatus.
Claim 7
Dependent Claim
99 words
In a communication switching system, the combination as claimed in claim 5, wherein the format of the digital information for calls from the traffic control station comprises: a special digital code identifying a store containing information for actuating the traffic plan control apparatus, digital code identifying one of said code translation stores; and a digit indicating the new value for the traffic plan digit, and also identifying whether the traffic plan digit is to be modified to that value in only the one code translation store, or also in all of the following code translation stores of the set.
Claim 8
Dependent Claim
41 words
In a communication switching system, the combination as claimed in claim 6, wherein said apparatus includes means which responsive to completion of the modification of the traffic plan digits causes initiation of selection of a termination to a ''''completion'''' announcement trunk.
Claim 9
Dependent Claim
56 words
In a communication switching system, the combination as claimed in claim 6, wherein said apparatus incluDes means responsive to a call in which the received digital information includes a format having said special code, but in which said special class of service is not recognized, to initiate selection of a termination to a ''''violation'''' announcement trunk.
Claim 10
Dependent Claim
89 words
In a communication switching system, the combination as claimed in claim 6, wherein there are a plurality of switching centers which are individually identified by respective ones of said special codes of said format, wherein said traffic control station is connected to a termination of one of these switching centers, which is the originating switching center for traffic control calls, and calls therefrom are routed to a terminating switching center corresponding to the special code, where the traffic plan control apparatus is actuated to modify the traffic plan digits.
Claim 11
Dependent Claim
63 words
In a communication switching system, the combination as claimed in claim 9, wherein the traffic plan control apparatus at the originating switching center includes means to check for said special class of service, and for calls having the format with one of said special codes but originating from other than said traffic control termination, to route the call to a violation announcement trunk.
Claim 12
Dependent Claim
42 words
In a communication switching system, the combination as claimed in claim 10, wherein the traffic plan control apparatus at said terminating switching center, upon completion of the modification of traffic plan digits, initiates selection of a termination to a ''''completion'''' announcement trunk.
Claim 13
Dependent Claim
94 words
In a communication switching system, the combination as claimed in claim 1, wherein said translation and routing means includes a memory comprising a plurality of word stores, each word store having a plurality of storage devices and each having an address individual thereto, there being address means providing access to one word store at a time, either randomly or sequentially; and wherein each of said code translation stores comprises at least one word store of the memory, and each of said route selection control stores comprises at least one word store of the memory.
Claim 14
Dependent Claim
91 words
In a communication switching system, the combination as claimed in claim 12, wherein said traffic plan control means includes a traffic control station, means to supply digital information from the traffic control station to said translation and routing means, and traffic plan control apparatus in the translation and routing means to analyze the digital information from the traffic control station to identify a code translation store and a traffic plan digital value, and to modify the value of the traffic plan digit in the memory word for said code translation store.
Claim 15
Dependent Claim
97 words
In a communication switching system, the combination as claimed in claim 13, wherein said code translation stores are organized into sets comprising word stores at successive addresses in the memory, each set comprising one or more of the code translation stores, each said set being associated with at least one of said route selection control stores which have addresses which follow successively after the code translation stores of the set, wherein different possible values of the traffic plan digits of each code translation store of a set identify different ones of the associated route selection control stores.
Claim 16
Dependent Claim
64 words
In a communication switching system, the combination as claimed in claim 14, wherein the traffic plan control apparatus of the translation and routing means is arranged to modify the value of the traffic plan digit of only one code translation store, or alternatively of all of the code translation stores of a set. depending on the digital information received from the traffic control station.
Claim 17
Dependent Claim
187 words
In a communication switching system, the combination as claimed in claim 15, wherein one of said terminations is a traffic control termination, and wherein said traffic control station is connected to the last said termination, and wherein the digital call information for calls from The traffic control station via its termination is received in a translation and routing means in the same manner as for normal calls via other terminations, the translation and routing means including means to recognize a special class of service for the traffic control termination to permit actuation of the traffic plan control apparatus; wherein the format of the digital information for calls from the traffic control station comprises: a special digital code identifying a word store containing information for actuating the traffic plan control apparatus; a digital code identifying one of said code translation stores; and a digit indicating the new value for the traffic plan digit, and also identifying whether the traffic plan digit is to be modified to that value in only the one code translation store, or also in all of the following code translation stores of the set.
Claim 18
Dependent Claim
87 words
In a communication switching system, the combination as claimed in claim 12, wherein said translation and routing means comprises processing apparatus and said memory, wherein said traffic plan control means includes traffic plan control apparatus which is a portion of said processing apparatus; and wherein each word store of said memory includes storage devices storing a process digit which identifies the type of word and indicates to the processing apparatus what processing action to take with respect to the other digital information read from that word store.
Claim 19
Dependent Claim
184 words
In a communication switching system, the combination as claimed in claim 17, wherein said code translation stores are organized into sets, each set comprising one or more of the code translation stores, each set comprising word stores having successive addresses, each set being associated with at least one of the route translation stores, which have addresses successively following the code translation store addresses of the set, some of the sets being associated with a plurality of the route selection control stores which have successive addresses; wherein different possible values of the traffic plan digit of each code translation store of the set identify different ones of the associated route selection control stores, each route selection control store associated with a set having a different value of the process digit, each value of the traffic plan digit corresponding to a value of a route selection control word process digit, wherein the processing apparatus includes bistable devices to store the traffic plan digit value of a selected code translation store, and to select a route selection control store having a corresponding value of the process digit.
Claim 20
Dependent Claim
176 words
In a communication switching system, the combination as claimed in claim 18, wherein one of said terminations is a traffic control termination connected to a traffic control station, wherein digital call information for calls from the traffic control station via its termination is received in the translation and routing means in the same manner as for normal calls via other terminations, the translation and routing means including means to recognize a special class of service for the traffic control termination to permit actuation of the traffic plan control apparatus; wherein the format of the digital information for calls from the traffic control station comprises: a special digital code identifying a store containing information for actuating the traffic plan control apparatus, a digital code identifying one of said code translation stores, and a digit indicating the new value of the traffic plan digit, and also identifying whether the traffic plan digit is to be modified to that value in only one code translation store, or also in all of the following code translation stores of the set.
Claim 21
Dependent Claim
102 words
In a communication switching system, the combination as claimed in claim 18, wherein there are a plurality of trunk groups, each comprising a plurality of trunks, each trunk having an individual one of said terminations; and wherein eaCh of the route selection control stores includes storage devices storing a route digit indicator digit and other storage devices which store information which may designate a single trunk group or a given plurality of trunk groups, depending on the value of the route digit indicator digit, and a given order of preference for the trunks groups to designate a primary route and alternate routes.
Claim 22
Dependent Claim
90 words
In a communication switching system, the combination as claimed in claim 20, wherein said traffic plan control means includes a traffic control station, means to supply digital information from the traffic control station to said translation and routing means, and traffic plan control apparatus in the translation and routing means to analyze the digital information from the traffic control station to identify a code translation store and a traffic plan digital value, and to modify the value of the traffic plan digit in that code translation store to that value.
Claim 23
Dependent Claim
96 words
In a communication switching system, the combination as claimed in claim 21, wherein one of said terminations is a traffic control termination, wherein said traffic control station is connected to the last said termination, and wherein digital call information for calls from the traffic control station via its termination is received in the translation and routing means in the same manner as for normal calls via other terminations, the translation and routing means including means to recognize a special class of service for the traffic control termination to permit actuation of the traffic plan control apparatus.
Claim 24
Dependent Claim
63 words
In a communication switching system, the combination as claimed in claim 22, wherein the traffic plan control apparatus of the translation and routing means is arranged to modify the value of the traffic plan digit of only one code translation store, or alternatively of all of the code translation stores of a set, depending on the digital information from the traffic control station.
Claim 25
Dependent Claim
100 words
In a communication switching system, the combination as claimed in claim 23, wherein the format of the digital information for calls from the traffic control station comprises: a special digital code identifying a store containing information for actuating the traffic plan control apparatus; a digital code identifying one of said code translation stores; and a digit indicating the new value for the traffic plan digit, and also identifying whether the traffic plan digit is to be modified to that value in only the one code translation store, or also in all of the following code translation stores of the set.
Claim 26
Dependent Claim
54 words
In a communication switching system, the combination as claimed in claim 24, wherein said memory includes a traffic plan translation code store identified by said special digital code, which store includes stored information which causes a bistable device in said traffic plan control apparatus to be set indicating a traffic plan call in process.
Claim 27
Dependent Claim
68 words
In a communication switching system, the combination as claimed in claim 25, wherein said means to selectively modify the respective values of the traffic plan digits comprises means to write into the devices storing the traffic plan digits of the code translation stores identified by the digital code of said format and also into succeeding code translation stores if so designated by said digit indicating the new value.
Claim 28
Dependent Claim
56 words
In a communication switching system, the combination as claimed in claim 26, wherein a normal routing plan is designated by two values of the traffic plan digit, and wherein the traffic plan control apparatus includes means to inhibit modification of a traffic plan digit responsive to its having a given one of said two normal values.
Claim 29
Dependent Claim
89 words
In a communication switching system, the combination as claimed in claim 26, wherein there are a plurality of switching centers which are individually identified by respective ones of said special codes of said format, wherein said traffic control station is connected to a terminatiOn of one of these switching centers, which is the originating switching center for traffic control calls, and calls therefrom are routed to a terminating switching center corresponding to the special code, where the traffic plan control apparatus is actuated to modify the traffic plan digits.
Claim 30
Dependent Claim
42 words
In a communication switching system, the combination as claimed in claim 28, wherein the code translation stores having a traffic plan digit comprise two word stores, with the traffic plan digit stored in the storage devices of the second word store thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |