Arrangement for reducing glare on two-way trunks

Claim 2

In a communication system, a first and a second switching office, a plurality of two-way trunks interconnecting said offices, control means at each said office for seizing idle ones of said trunks for calls outgoing from said offices, and an arrangement for blocking the simultaneous seizure of idle ones of said trunks by the control means at both offices comprising circuit means effective upon the successive seizures of predetermined numbers of first ones of said trunks for busying at one of said offices a distinct number of other ones of said trunks, wherein the distinct number of other trunks busied varies with the number of first trunks seized.

Claim 3

The invention defined in claim 1 wherein said circuit means comprises means for directionalizing at least two of said other trunks.

Claim 4

The invention defined in claim 1 wherein each said two-way trunk comprises an individual trunk circuit associated with each said office and transmission means interconnecting said trunk circuits, and wherein said circuit means comprises first means in each said trunk circuit for detecting when said trunk circuit has been seized for a call outgoing from the office associated therewith, second means in each said trunk circuit for detecting when said trunk circuit has been seized for a call incoming to the office associated therewith, and means responsive to said first or said second detecting means for blocking the seizure of said trunk circuit by said control means.

Claim 5

The invention defined in claim 3 wherein said circuit means comprises means for actuating the blocking means of one of said first office trunk circuits under control of the blocking means of another of said first office trunk circuits and means for actuating the blocking means of one of said second office trunk circuits under control of the second detecting means of another of said second office trunk circuits.

Claim 6

In a communication system, a first and a second switching office, a pluralIty of two-way trunks interconnecting said offices, control means at each said office for testing the busy condition of said trunks for calls outgoing from said offices, and an arrangement for blocking the simultaneous seizure of idle ones of said trunks by the control means at both said offices comprising circuit means effective upon each seizure of a predetermined number of said trunks for imposing a busy condition at the opposite ends of at least two other ones of said trunks.

Claim 7

In a communication system, a first and a second switching office, a pluralIty of two-way trunks interconnecting said offices, control means at each said office for testing the busy condition of said trunks for calls outgoing from said offices, and an arrangement for blocking the simultaneous seizure of idle ones of said trunks by the control means at both said offices comprising circuit means effective upon each seizure of a predetermined number of said trunks for imposing a busy condition at the opposite ends of at least two other ones of said trunks.

Claim 8

The invention defined in claim 5 wherein said predetermined number is one.

Claim 9

The invention defined in claim 5 wherein said predetermined number is at least two.

Claim 10

The invention defined in claim 5 wherein each said trunk comprises relay means associated with each said office for blocking the seizure of said trunk by said associated office control means, and wherein said circuit means comprises first means responsive to the seizure of a first one of said trunks for actuating at said first office the relay means associated with another one of said trunks and second means responsive to the seizure of said first trunk for actuating at said second office the relay means associated with still another one of said trunks.

Claim 11

The invention defined in claim 5 wherein each said trunk comprises relay means associated with each said office for blocking the seizure of said trunk by said associated office control means and wherein said circuit means comprises first means responsive to the concurrent seizure of a plurality of said trunks for actuating at said first office the relay means associated with a first one of said trunks other than said plurality and second means responsive to the seizure of a number of trunks less than said plurality for actuating at said second office the relay means associated with a second one of said trunks other than said plurality.

Claim 12

In a communication system, first and second switching offices, a plurality of two-way trunks interconnecting said offices, control means at each said office for extending calls in either direction over idle ones of said trunks and means for blocking attempts to simultaneously extend calls in both directions over the same trunks comprising circuit means for converting at least a pair of said two-way trunks into one-way trunks in opposite directions in response to each seizure of a predetermined number of trunks other than said pair.

Claim 13

In a communication system, first and second switching offices, a plurality of two-way trunks interconnecting said offices, control means at each said office for extending calls in either direction over idle ones of said trunks and means for blocking attempts to simultaneously extend calls in both directions over the same trunks comprising circuit means for converting at least a pair of said two-way trunks into one-way trunks in opposite directions in response to each seizure of a predetermined number of trunks other than said pair.

Claim 14

The invention defined in claim 10 wherein said circuit means comprises means for converting one of said pair of trunks into a one-way trunk in accordance with a first predetermined number of said other trunks and means for converting the other trunk of said pair into a one-way trunk in accordance with a second predetermined number of said other trunks.

Claim 15

In a communication system at least two switching offices, a plurality of two-way trunks interconnecting said offices, means at each said office for selecting said trunks, and circuit means at one of said offices effective upon each seizure of a predetermined number of said trunks for making a first portion of said trunks available for selection at said one office and for making a second portion of said trunks available for selection at said other office.

Claim 16

In a communication system at least two switching offices, a plurality of two-way trunks interconnecting said offices, means at each said office for selecting said trunks, and circuit means at one of said offices effective upon each seizure of a predetermined number of said trunks for making a first portion of said trunks available for selection at said one office and for making a second portion of said trunks available for selection at said other office.

Claim 17

In a communication system including communication paths extending between first and second offices, each end of each said path having a two-way trunk circuit associated therewith, means in each trunk circuit for indicating that the associated communication path is busy, and circuit means responsive to seizure of particular communication paths for operating the busy indicating means associated with other of said communication paths, said circuit means including means in the trunk circuits associated with one end of two of said particular communication paths for operating the busy indicating means of a trunk circuit associated with another communication path and means in the trunk circuit associated with the other end of said particular communication paths for operating the busy indicating means of a tRunk circuit associated with a distinct other communication path.

Claim 18

In a communication system including communication paths extending between first and second offices, each end of each said path having a two-way trunk circuit associated therewith, means in each trunk circuit for indicating that the associated communication path is busy, and circuit means responsive to seizure of particular communication paths for operating the busy indicating means associated with other of said communication paths, said circuit means including means in the trunk circuits associated with one end of two of said particular communication paths for operating the busy indicating means of a trunk circuit associated with another communication path and means in the trunk circuit associated with the other end of said particular communication paths for operating the busy indicating means of a tRunk circuit associated with a distinct other communication path.