US 5,179,587 A · Digital telecommunications exchange system

Abstract

A telecommunications system operable to connect terminal devices for exchange of data has control devices (ST, GST), an accessory control device (HS), and a memory (SP). The control devices effect addressed connections via hierarchical coupling fields (KF) to which terminal devices (T, PC, VP) and/or transmission lines (VL) are coupled, each by two user channels and one signalling channel. Routine transmissions to and from a telephone apparatus (T), computer (PC) or the like are effected by connection addressing codes transmitted on the signalling channel. For special functions or transmissions, a unique code is inserted in the signalling data, which causes the control device (GST, ST) to pass the signalling data to the accessory control device (HS). The accessory control device replaces the unique code with a connection addressing code if the terminal is authorized, and returns the signalling information to the control device, where it effects the desired connection. The memory (SP) stores data not used in switching, such as "telephone book" listings, usage data, authorizations and the like. When a transmission involves a change in redundantly stored data in the memory and in the terminal device memories, the control devices and/or terminal devices locate and update all occurrences of the data. The system connects special functions to the exchange, without interfering with basic switching functions.

Claims19

Dependent claims

A digital telecommunications exchange system with a control device having a memory, and with a large number of termination circuits for making operative connections via subscribers' lines including at least one of connection lines for terminal devices and line circuits for additional exchange systems, the subscribers' lines in each case having at least two user channels and one data/signalling channel, information on the user channels being transmitted between the connection lines and a coupling device of the telecommunications exchange system, and information on the data/signalling channel being carried between said subscribers' lines and the control device via a bus system, the telecommunications exchange system comprising:

a data memory;
at lest one computer coupled to one of the connection lines, the computer having a computer memory;
and,
an accessory control device associated with said control device, and means to transmit data between the computer and the control device, for effecting data transmission in at least one direction between the computer and the data memory, and wherein changes in contents of said data memory are monitored by the accessory control device, the accessory control device including a table of information as to correspondence between data in the data memory and at least one of data int he computer memory and other data in the data memory, whereby changes to the data memory are likewise effected in corresponding contents of at least one of the data memory and the computer memory.

1 more element

A digital telecommunications exchange system with a control device having a memory, the telecommunications exchange system having a large number of connection circuits for making operative connections between at least two of a plurality of terminal devices including one of terminals and exchange systems, via communication lines in each case having at least two user channels and one data/signalling channel, information on the user channels being transmitted over connection lines between the terminal devices and a coupling device of the telecommunications exchange system, and information on the data/signalling channel being carried between the terminal devices and the control device via a bus system, for effecting addressed connections of the communication lines between the terminal devices, comprising:

an accessory control device associated with the control device, and wherein switching information intended for the control device and transmitted via the data/signalling channel is marked by a first indication code by one of said terminals and exchange devices, said information being processed in the control device of the telecommunications exchange system, and instead of the first indication code, a different special indication code being used by at least one of said terminals and exchange devices, respectively, which are authorized, and transmitted to the accessory control device, the accessory control device being operable to replace said different special indication code with the first indication code, whereupon the switching information is transmitted to the control device of the telecommunications exchange system for effecting a desired function.

Dependencies are inferred from the claim text.

Digital telecommunications exchange system

Life of this patent

Digital telecommunications exchange system

Life of this patent

Abstract

Claims19