Telephone service request scan and dial pulse scan device

Claim 2

In a telephone switching system including a plurality of lines conveying telephone communications and a central control, a scanning circuit arrangement comprising a matrix of scanning terminals respectively connected to said lines and arranged in rows and columns, a group address register associated with said matrix and controlled by said central control at a first rate, means controlled by said group address register for sequentially scanning said matrix row by row and driving therefrom group test words defined by a group address, a comparator, means for sequentially generating subgroup test words forming parts of said group test words, a subgroup address register associated with said generating means and controlled by said central control at a second rate multiple of the first rate, said subgroup test words being defined by a subgroup address, a first multiregister comprising a plurality of test registers for storing said subgroup test words at test subgroup addresses formed by both said group address and said subgroup address, means for sequentially applying to the comparator new subgroup test words actually generated by said generating means and previous subgroup test words stored in said test registers, said new and previous subgroup test words being compared having the same test subgroup addresses, means in said comparator for detecting the addresses of the bits in said new subgroup test words which have changed, a second multiregister comprising a plurality of originating registers respectively assigned to said telephone communications, means in said second multiregister for deriving from a scanning terminal address comprising the group address, the subgroup address and the bit address, the address of the originating register assigned to the communication through the line connected to said scanning terminal, and means to enter said change in said originating register.

Claim 3

In a telephone switching system including a plurality of lines conveying telephone communications and a central control, a scanning circuit arrangement as set forth in claim 1 in which the second multiregister comprises a plurality of originating registers, a plurality of supplemental registers having addresses each including the group address, the subgroup address and the bit address of a scanning terminal, containing the address of an originating register when an originating register is already assigned to the communication through the line connected to said scanning terminal and containing no address when an originating register is to be assigned to said communication, a special register containing the address of an idle originating register to be seized and means for selectively entering the change undergone by said scanning terminal into said assigned originating register and said idle originating register.

Claim 4

In a telephone switching system including a given number of group highways conveying telephone communications in multiplexed time slots and a central control, a scanning circuit arrangement comprising a group register having a given number of binary stages, means controlled by said central control for sequentially connecting at a first rate said group register to said group highways during a selected number by the time slots, the product of the group highway number by the time slot Selected number being equal to the binary stage number, the contents of said group register defining group test words and said connecting means defining group addresses, a comparator, means for sequentially generating subgroup test words forming parts of said group test words, a subgroup address register associated with said generating means and controlled by said central control at a second rate multiple of the first rate, said subgroup test words being defined by a subgroup address, a first multiregister comprising a plurality of test registers for storing said subgroup test words at test subgroup addresses formed by both said group address and said subgroup address, means for sequentially applying to the comparator new subgroup test words actually generated by said generating means and previous subgroup test words stored in said test registers, said new and previous subgroup test words being compared having the same test subgroup addresses, means in said comparator for detecting the addresses of the bits in said new subgroup test words which have changed, a second multiregister comprising a plurality or originating registers respectively assigned to said telephone communications, means in said second multiregister for deriving from a scanning terminal address comprising the group address, the subgroup address and the bit address, the address of the originating register assigned to the communication through the line connected to said scanning terminal, and means to enter said change in said originating register.

Claim 5

In a telephone switching system including a given number of group highways conveying telephone communications in multiplexed time slots and a central control, a scanning circuit arrangement comprising a group register having a given number of binary stages, means controlled by said central control for sequentially connecting at a first rate said group register to said group highways during a selected number by the time slots, the product of the group highway number by the time slot Selected number being equal to the binary stage number, the contents of said group register defining group test words and said connecting means defining group addresses, a comparator, means for sequentially generating subgroup test words forming parts of said group test words, a subgroup address register associated with said generating means and controlled by said central control at a second rate multiple of the first rate, said subgroup test words being defined by a subgroup address, a first multiregister comprising a plurality of test registers for storing said subgroup test words at test subgroup addresses formed by both said group address and said subgroup address, means for sequentially applying to the comparator new subgroup test words actually generated by said generating means and previous subgroup test words stored in said test registers, said new and previous subgroup test words being compared having the same test subgroup addresses, means in said comparator for detecting the addresses of the bits in said new subgroup test words which have changed, a second multiregister comprising a plurality or originating registers respectively assigned to said telephone communications, means in said second multiregister for deriving from a scanning terminal address comprising the group address, the subgroup address and the bit address, the address of the originating register assigned to the communication through the line connected to said scanning terminal, and means to enter said change in said originating register.