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US 3,943,298 AGranted
Automatic number identification
AssigneeStromberg-Carlson Corporation
InventorsRobert J. Clark, Gordon H. Davis, Amin Y. Zaky
Life of this patent
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Abstract
An automatic number identification system in a tributary office having simultaneous dual operation for high traffic capacity. A pair of identifier units applying identification signals via the sleeve wire associated with the calling stations to a common matrix or directory number network.
Claims11
Improved automatic number identification apparatus in a telephone system of the type having:
- a central office;
- a plurality of subscriber lines connected to said central office, each of said subscriber lines having
- a sleeve lead associated therewith in said central office;
- at least two outgoing trunk circuits in said central office;
- means in said central office for connecting the sleeve lead associated with one of said plurality of subscriber lines initiating a call to one of said outgoing trunk circuits, said connecting means functioning further for connecting said sleeve lead associated with another of said plurality of subscriber lines initiating a call to another of said outgoing trunk circuits;
- a plurality of number elements, at least one of said plurality of number elements each associated with one of said plurality of subscriber lines and connected to said sleeve lead associated therewith;
- and
- a plurality of directory number digit buses, said plurality of number elements each so connected through isolation means to said digit buses that a signal issuing from any one of said number elements appears simultaneously on preselected ones of said digit buses to form indicia thereon representative of a unique directory number associated with said any one number element;
- wherein the improvement comprises:
- an identifier unit having said plurality of directory number digit buses connected thereto;
- another identifier unit having said plurality of directory number digit buses connected thereto;
- means for connecting the sleeve lead associated with one said subscriber line initiating a call from said one outgoing trunk circuit to said identifier unit;
- and
- means for connecting the sleeve lead associated with said other subscriber line initiating a call from said other outgoing trunk circuit to said other identifier unit;
- each of said identifier units including:
- a control means,
- means responsive to said control means during an identification time period for generating an identification signal for application to said sleeve lead connected thereto,
- means responsive to said control means during said identification time period for disabling said generating means of the alternate identifier unit, and
- means responsive to said control means during said identification time period for storing said indicia appearing on said number element buses in response to said identification signal applied.
16 more elements
Improved automatic number identification apparatus in a telephone system of the type having:
- a central office;
- a plurality of subscriber lines connected to said central office, each of said subscriber lines having
- a sleeve lead associated therewith in said central office;
- at least two outgoing trunk circuits in said central office;
- means in said central office for connecting the sleeve lead associated with one of said plurality of subscriber lines initiating a call to one of said outgoing trunk circuits, said connecting means functioning further for connecting said sleeve lead associated with another of said plurality of subscriber lines initiating a call to another of said outgoing trunk circuits;
- a plurality of number elements, at least one of said plurality of number elements each associated with one of said plurality of subscriber lines and connected to said sleeve lead associated therewith;
- a plurality of directory number digit buses, said plurality of number elements each so connected through isolation means to said digit buses that a signal issuing from any one of said number elements appears simultaneously on preselected ones of said digit buses to form indicia thereon representative of a unique directory number associated with said any one number element,
- wherein the improvement comprises:
- a first identifier unit having said plurality of directory number digit buses connected thereto and having an idle state and a busy state;
- a second identifier unit having said plurality of directory number digit buses connected thereto and having an idle state and a busy state;
- second means associated with each of said trunk circuits for connecting said sleeve lead associated with said subscriber line initiating a call connected thereto to said first or said second identifier unit in said idle state;
- each of said identifier units including:
- a control means having means therein responsive to said second connecting means for changing the state of said identifier unit from idle to busy, said identifier unit executing an identification program while in said busy state;
- means responsive to said control means during said program for applying an identification signal to said connected sleeve lead;
- means in said first identifier unit responsive to said control means therein during said program of said first identifier unit for delaying said program of said second identifier unit;
- means in said second identifier unit responsive to said control means therein during said program of said second identifier unit for delaying said program of said first identifier unit;
- and
- means responsive to said control means during said program for storing said indicia appearing on said number element buses in response to said identification signal applied to said connected sleeve lead.
15 more elements
Number identification apparatus in a telephone system, comprising:
- a central office;
- a plurality of subscriber lines connected to said central office, each of said subscriber lines having:
- a sleeve lead associated therewith in said central office;
- at least two outgoing trunk circuits in said central office;
- means in said central office for connecting the sleeve lead associated with one of said plurality of subscriber lines initiating a call to one of said outgoing trunk circuits, said connecting means functioning further for connecting the sleeve lead associated with another of said plurality of subscriber lines initiating a call to another of said outgoing trunk circuits;
- a plurality of number element, each having a preselected directory numeral assigned thereto, at least one of said plurality of number elements each associated with a different one of said plurality of subscriber lines, said plurality of number elements assembled in nesting groups of x.sup.1,2 . . . n.sup.-1 number elements where x is the radix of a directory number representation and n is the number of digits in said number representation, each of said number elements in any one of said groups having said preselected directory numeral assigned thereto including like numerals of significance x.sup.1,2 . . . n.sup.-1 in the corresponding positional representation of said preselected directory numeral assigned thereto, each of said number elements having:
- an input terminal for connection to said sleeve lead associated therewith,
- a first output lead connected through an isolation device to said input terminal, and
- a second output lead connected through a second isolation device to said input terminal;
- x.sup.0,1 . . . n buses, each of said x.sup.0,1 . . . n buses having x lines, each of said x lines of any of said x.sup.0,1 . . . n buses having a digit value of said number representation, said first output lead of each of said plurality of number elements connected to one of said x lines of said x.sup.0 bus having said digit value of said number representation corresponding to the numeral of the least significant position of said directory numeral assigned;
- a high-order digit bus for each of said x.sup.1 groups connected to said second output lead of each of said number elements in said group, said high-order digit bus connected through respective isolation devices to one of said x lines, respectively, of said x.sup.1,2 . . . n.sup.-1 bus having said digit value of said number representation corresponding to said like numeral of significance x.sup.1,2 . . . n.sup.-1 for each of said nesting groups;
- said plurality of number elements assembled, further assembled in groups of x.sup.n /a number elements, where a is any digit .noteq.0, x of said number representation;
- ax lines, said high-order digit buses of each (x.sup.n /a)/x of said x.sup.n /a groups connected to one of said ax lines;
- and
- means for selectively connecting said ax lines to said x lines of said x.sup.n bus, whereby all the number elements of any one of said x.sup.n /a groups may be assigned any numeral of significance x.sup.n in said preselected directory numeral.
12 more elements
Dependencies are inferred from the claim text.