Translation data change circuits for telephone switching systems

Claim 2

In a telephone system, the combination comprising a primary store for storing a first plurality of information words, each of said words comprising a data portion and an address portion defining the location in said primary store of an information word, a secondary store for storing a second plurality of information words, each of said words comprising a data portion and an address portion defining the location in said secondary store of an information word, a first address register for storing the address portion of a predetermined one of said second plurality of information words, a data register, a second address register, means for transferring the data portion and the address portion of a predetermined one of said first plurality of information words from said primary store to said data register and said second address register, respectively, means for comparing the address portion of said information words in said first and second address registers and for generating a match signal when said addresS portions agree, and means responsive to said match signal for transferring said data portion of said predetermined one of said first plurality of information words in said data register to the location in said secondary store defined by said address portion in said first address register.

Claim 3

In a telephone system, the combination comprising a primary store for storing a first plurality of information words, each of said words comprising a data portion and an address portion defining the location in said store of an information word, a secondary store for storing a second plurality of information words, each of said words also comprising a data portion and an address portion defining the location in said secondary store of an information word, a first address register for storing the address portion of a predetermined one of said second plurality of information words, a data register, a second address register, transfer means for transferring the data portion and the address portion of a predetermined one of said first plurality of information words from said primary store to said data register and said second address register, respectively, first means for comparing the address portion of said information words in said first and second address registers and for generating a match signal when said address portions agree, means responsive to said match signal for reading from said secondary store the data portion of said predetermined one of said second plurality of information words stored at a location defined by the address portion stored in said first address register, second means also responsive to said match signal for comparing said last-mentioned data portion and said data portion stored in said data register and for generating a mismatch signal when said data portions disagree, and means responsive to said mismatch signal for transferring the data portion in said data register to the location in said secondary store defined by said address portion in said first address register.

Claim 4

In a telephone system, the combination comprising a primary store for storing a first plurality of information words, each of said words comprising a data portion and an address portion defining the location in said store of an information word, a secondary store for storing a second plurality of information words, each of said words also comprising a data portion and an address portion defining the location in said secondary store of an information word, a first address register for storing the address portion of a predetermined one of said second plurality of information words, a data register, a second address register, transfer means for transferring the data portion and the address portion of a predetermined one of said first plurality of information words from said primary store to said data register and said second address register, respectively, first means for comparing the address portion of said information words in said first and second address registers and for generating a match signal when said address portions agree, means responsive to said match signal for reading from said secondary store the data portion of said predetermined one of said second plurality of information words stored at a location defined by the address portion stored in said first address register, second means also responsive to said match signal for comparing said last-mentioned data portion and said data portion stored in said data register and for generating a mismatch signal when said data portions disagree, and means responsive to said mismatch signal for transferring the data portion in said data register to the location in said secondary store defined by said address portion in said first address register.

Claim 5

In a telephone system, the combination according to claim 2, in which said first plurality of information words is stored in two areas of said primary store, a first area containing words of said first plurality of information words in which the data portion of each of said words contains old information and a second area containing other words of said first plurality of information words in which the data portion of each of said words contains new information, and in which said transfer means includes means for switching between said first and second areas of said primary store.

Claim 6

In a telephone system, the combination according to claim 2, in which said primary store generates a timing signal after each transfer of an address portion of a predetermined one of said first plurality of information words to said second address register, and also comprising means responsive to said timing signal for advancing said first register to an address portion defining the location in said secondary store of a succeeding information word.

Claim 7

In a telephone system having common control, the combination comprising a primary store for storing a first plurality of information words each comprising a translation data group and an address data group, a secondary store for storing a second plurality of information words each comprising a translation data group and an address data group, means including address decoder means operated responsive to coded signals from said common control for reading from said secondary store a particular translation data group during a first portion of the operative cycle of said common control, a first address register having stored therein a predetermined one of the address data groups of said second plurality of information words, readout means for reading from said primary store during a second portion of said operative cycle a translation data group and an address data group of said first plurality of information words and for storing said last-mentionEd translation data group in a data register and said last-mentioned address data group in a second address register, first comparator means for comparing the address data group in said first address register and the address data group in said second address register and for generating a match signal when said address data groups in said registers agree, means including said decoder means operated responsive to said match signal for identifying in said secondary store the storage location defined by said address data group in said first address register, means also responsive to said match signal for reading from said secondary store a translation data group stored at said last-mentioned storage location, second comparator means for comparing said last-mentioned translation data group and the translation data group stored in said data register and for generating a mismatch signal when said last-mentioned translation data groups disagree, and means responsive to said mismatch signal for writing in said last-mentioned storage location of said secondary store the translation data group stored in said data register.

Claim 8

In a telephone system having common control, the combination comprising a primary store for storing a first plurality of information words each comprising a translation data group and an address data group, a secondary store for storing a second plurality of information words each comprising a translation data group and an address data group, means including address decoder means operated responsive to coded signals from said common control for reading from said secondary store a particular translation data group during a first portion of the operative cycle of said common control, a first address register having stored therein a predetermined one of the address data groups of said second plurality of information words, readout means for reading from said primary store during a second portion of said operative cycle a translation data group and an address data group of said first plurality of information words and for storing said last-mentionEd translation data group in a data register and said last-mentioned address data group in a second address register, first comparator means for comparing the address data group in said first address register and the address data group in said second address register and for generating a match signal when said address data groups in said registers agree, means including said decoder means operated responsive to said match signal for identifying in said secondary store the storage location defined by said address data group in said first address register, means also responsive to said match signal for reading from said secondary store a translation data group stored at said last-mentioned storage location, second comparator means for comparing said last-mentioned translation data group and the translation data group stored in said data register and for generating a mismatch signal when said last-mentioned translation data groups disagree, and means responsive to said mismatch signal for writing in said last-mentioned storage location of said secondary store the translation data group stored in said data register.

Claim 9

In a telephone system, the combination according to claim 5 in which the address data group stored in said first address register is determined by said common control.

Claim 10

In a telephone system, the combination according to claim 5 also comprising a counter circuit operated responsive to timing signals from said primary store for advancing said first register to an address data group defining the location in said secondary store of a succeeding information word.

Claim 11

In a telephone system, the combination according to claim 5, said primary store having a first and a second storage area each containing said first plurality of information words, said first area containing old translation data groups and said second area containing recently changed translation data groups, and in which said readout means includes means for switching between said first and second storage areas of said primary store.

Claim 12

In a telephone switching system having a common control, a first store for storing current customer service information, said first store being operable responsive to address signals from said common control to supply said current information for completing customer calls during a first phase of an operative cycle, a second store having a first section for storing recent change customer service information, means for reading said recent change information from said first section of said second store and temporarily storing said last-mentioned information in a buffer register, means responsive to second address signals from said common control during a second phase of said operative cycle for periodically reading said current information from said first store, a comparator means for comparing said recent change information in said buffer register and said current information read from said first store to generate a mismatch signal when said last-mentioned information groups disagree, means responsive to said mismatch signal for writing said recent change information contained in said buffer register in said first store, said second store having a second section for storing updated recent change customer service information, and means for switching between said buffer register and said first and second sections of said second store.

Claim 13

In a telephone switching system having a common control, a first store for storing current customer service information, said first store being operable responsive to address signals from said common control to supply said current information for completing customer calls during a first phase of an operative cycle, a second store having a first section for storing recent change customer service information, means for reading said recent change information from said first section of said second store and temporarily storing said last-mentioned information in a buffer register, means responsive to second address signals from said common control during a second phase of said operative cycle for periodically reading said current information from said first store, a comparator means for comparing said recent change information in said buffer register and said current information read from said first store to generate a mismatch signal when said last-mentioned information groups disagree, means responsive to said mismatch signal for writing said recent change information contained in said buffer register in said first store, said second store having a second section for storing updated recent change customer service information, and means for switching between said buffer register and said first and second sections of said second store.

Claim 14

In a telephone switching system, a central control, a first store for storing information words comprising translation data and address data, a second store for storing information words also comprising said translation data and said address data, means responsive to instruction from said central control for reading particular translation data from said second store during a normal read phase of an operative cycle of said central control, a first address register having stored therein address data for a predetermined one of said information words, a second address register, a data register, means for reading information words fRom said first store during an updating phase of said operative cycle and for storing the translation data and the address data of said words in said data and second address registers, respectively, first comparator means for comparing the address data in said first and second registers and for generating a match signal when the address data in said last-mentioned registers agree, means responsive to said match signal for reading the translation data from said second store at the location defined by the address data in said first address register, second comparator means for comparing said last-mentioned translation data and the translation data contained in said data register and for generating a mismatch signal when said last-mentioned translation data groups disagree, and means responsive to said mismatch signal for writing in said second store the translation data contained in said data register at the location in said second store defined by the address data in said first address register.

Claim 15

In a telephone switching system, a central control, a first store for storing information words comprising translation data and address data, a second store for storing information words also comprising said translation data and said address data, means responsive to instruction from said central control for reading particular translation data from said second store during a normal read phase of an operative cycle of said central control, a first address register having stored therein address data for a predetermined one of said information words, a second address register, a data register, means for reading information words fRom said first store during an updating phase of said operative cycle and for storing the translation data and the address data of said words in said data and second address registers, respectively, first comparator means for comparing the address data in said first and second registers and for generating a match signal when the address data in said last-mentioned registers agree, means responsive to said match signal for reading the translation data from said second store at the location defined by the address data in said first address register, second comparator means for comparing said last-mentioned translation data and the translation data contained in said data register and for generating a mismatch signal when said last-mentioned translation data groups disagree, and means responsive to said mismatch signal for writing in said second store the translation data contained in said data register at the location in said second store defined by the address data in said first address register.

Claim 16

In a telephone switching system, the combination as claimed in claim 10 also comprising means for selectively introducing address data into said first address register from said central control and for stepping said first address register to introduce therein address data defining successive storage locations in said second store.

Claim 17

In a telephone switching system, the combination according to claim 11 in which said means for stepping said first address register is operated responsive to address timing signals from said first store.