Method for transferring information in the form of time separated signal elements between subscribers in a telecommunication system and a telecommunication system, etc.

Claim 3

A method as recited in claim 1, wherein the signal elements are synchronous delta modulated signals.

Claim 4

A method as recited in claim 1, wherein the signal elements are asynchronous delta modulated signals.

Claim 5

A method as recited in claim 1, wherein the signal elements are pulse amplitude modulated signals.

Claim 6

A method as recited in claim 1, wherein the signal elements are pulse code modulated signals.

Claim 7

A telecommunication system comprising: at least one group of subscriber equipments; a control unit; and a transmission channel interconnecting said subscriber equipments and said control unit, said control unit including means for selecting a call number from a set of available call numbers when a connection is to be established between at least two of said subscriber equipments and means for transferring the selected call number to said transmission channel; and each subscriber equipment including information transmitting means, information receiving means, means responsive to said control unit for registering the selected call number on said transmission channel from said control unit, means operative in synchronism with said information transmitting means to transmit the so-registered call number to said transmission channel, comparison means for comparing the call number stored in said registering means with subsequently received call numbers from other subscriber equipments, and means for activating said information receiving means when said comparing means indicates a conformity between the call number stored in said registering means and a subsequently received call number from another subscriber equipment.

Claim 8

A telecommunication system comprising: at least one group of subscriber equipments; a control unit; and a transmission channel interconnecting said subscriber equipments and said control unit, said control unit including means for selecting a call number from a set of available call numbers when a connection is to be established between at least two of said subscriber equipments and means for transferring the selected call number to said transmission channel; and each subscriber equipment including information transmitting means, information receiving means, means responsive to said control unit for registering the selected call number on said transmission channel from said control unit, means operative in synchronism with said information transmitting means to transmit the so-registered call number to said transmission channel, comparison means for comparing the call number stored in said registering means with subsequently received call numbers from other subscriber equipments, and means for activating said information receiving means when said comparing means indicates a conformity between the call number stored in said registering means and a subsequently received call number from another subscriber equipment.

Claim 9

A telecommunication system as recited in claim 6 wherein said information transmitting means and said information receiving means is a delta modulation transmitter-receiver.

Claim 10

A telecommunication system as recited in claim 6 wherein said information transmitting means and said information receiving means is a pulse amplitude modulation transmitter-receiver.

Claim 11

A telecommuNication system as recited in claim 6 wherein said information transmitting means and said information receiving means is a pulse code modulation transmitter-receiver.

Claim 12

A telecommunication system as recited in claim 6, comprising a switching means (R) for connecting during alternating time periods, the subscriber equipments (S1-S256) to each other for transferring signal elements between the subscribers, and the subscriber equipments to the control unit (CU) for transferring control information between the control unit and the subscriber equipments.

Claim 13

A telecommunication system as recited in claim 6 wherein each subscriber equipment further comprises a line number register where a line number associated with the respective subscriber is registered, the comparison means (E1a, E1b) comparing the line number registered in the line number register (LNa, LNb) with each control information transmitted from the control unit (CU) during the time periods intended for transferring of control information between the control unit (CU) and the subscriber equipment in order to determine if the control information is intended for the subscriber in question.

Claim 14

A telecommunication system as recited in claim 6 further comprising a ringing signal code generator for continuously transmitting a ringing signal number (RSN) together with a signal element representing a ringing signal to all the subscriber equipments, the control unit (CU) further comprising means (SK2) for registering the ringing signal number in the registering means (CNa, CNb) of each called subscriber so that in the subscriber equipments where conformity is obtained in the comparison means (E1a, E1b) between the ringing signal number registered in the registering means (CNa, CNb) and the ringing signal number transmitted from the ringing signal code generator, the information receiving means being activated in the same way as upon reception of other signal elements.

Claim 15

A telecommunication system as recited in claim 6, the control unit (CU) further comprises a ringing tone code generator arranged to be connected to a calling subscriber and to transmit signal elements representing a ringing tone together with the call number registered in the registering means (CNa, CNb) of the calling subscriber, the signal elements representing the ringing tone being demodulated in the same way as other signal elements.

Claim 16

A telecommunication system as recited in claim 6 wherein the subscribers are arranged in groups (G1, G2), the subscriber equipments belonging to the same group being connected directly with each other during time periods for transferring of signal information, each group comprising a translating register (AC1, AC2) with a storage cell for each possible call number within the same group for storing a call number belonging to a subscriber within another group with which a connection has been established, so that when a call number together with a signal element intended for a subscriber in another group is transmitted from a subscriber, the transmitted call number is replaced in the translating register (AC1 AC2) by the call number valid within the other group and stored in the corresponding storage cell, the control unit (CU) further comprising means for registering in the translating register (AC1, AC2) in the respective group the call number selected from the other group in the storage cell corresponding to the selected call number within the associated group upon establishing a connection between subscribers belonging to different groups.

Claim 17

A telecommunication system as recited in claim 6 wherein the subscribers are arranged in groups and each subscriber group (G1, G2) further comprises a buffer register (BR1, BR2) to which the signal elements intended for other groups are fed in due order from the group, and the control unit further comprising timing means for transMitting the signal elements from the buffer register (RB1, RB2) so that the transmitting is executed in cyclical order from the different buffer registers.

Claim 18

A telecommunication system as recited in claim 6 wherein the subscribers are arranged in groups and each subscriber group (G1, G2) further comprises control circuits (R1, R2, A70, A71, A80, A81) activated by timing means in the control unit so that the transferring of information between subscribers belonging to the same group is done during certain periodically repeated time periods (j0) during which registering of information intended for other groups is done in the buffer registers (BR1, BR2), while the transferring of information from the respective buffer register to other groups is done during the time periods (j1, j2) separated from the first-mentioned time periods and the control of the different groups is executed alternately during an individual time period (u1, u2) separated from the periods for transferring information.