Multiplex communications – Wide area network – Packet switching
Patent
1991-12-03
1993-08-31
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 84, H04J 322
Patent
active
052415392
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a communication system according to the preamble of patent claim 1, and also to interfaces matched thereto.
A system of this type is known from German Offenlegungsschrift 3,033,871. This communication system consists of a first subscriber network in which the voice processing is executed with pulse code modulation and of a second subscriber network in which the voice processing is executed with delta modulation. The subscribers of the networks are connected to one another across an interface, with a signaling converter being provided in the interface. The subscriber terminals of the first network, which are equipped with a cryptogenerator, additionally have a delta modulation device corresponding to the second network for voice processing.
SUMMARY OF THE INVENTION
The object of the invention is to disclose a communication system or interfaces of the type mentioned at the beginning in which it is possible to connect networks having different bit rates in a simple manner.
This object is achieved according to the invention by a communication system, having a first subscriber network in which the subscriber terminals have a voice processing device employing pulse code modulation, having at least one further subscriber network in which the subscriber terminals have voice processing devices and in which the bit transmission rate is not greater than that in the first subscriber network, having at least one interface with signaling converter connecting the networks, having predetermined subscriber terminals of the first subscriber network, which additionally have a voice processing device in accordance with each of the further subscriber networks. The subscriber terminals have data format adaptation devices connected downstream of the additional voice processing devices. The interfaces have data format adaptation devices, and each of the interfaces has a source network identification device with which a source network identifier is appended to the call number from the further subscriber network, by means of which one of the additional voice processing and data format adaptation devices is switched on in the subscriber terminal of the first network. One of the interfaces has a data format adaptation device and a source network identification device, with which a source network identifier is appended to the call number from a further network, by means of which one of the additional voice processing and data format adaptation devices is switched on in the subscriber terminal of the first network. Another of the interfaces has a data format adaptation device and a modem for digital signal transmission in an analog network. A source network identification device is provided, with which a source network identifier is appended to the call number from the analog network, by means of which one of the additional voice processing and data format adaptation devices is switched on in the subscriber terminal of the first network.
A great advantage of the communication system according to the invention is that it is also possible to exchange encrypted messages between subscribers on different networks without the message appearing in the interface without encryption.
A further advantage is conferred by the fact that it is not necessary to alter the existing networks in the communication system according to the invention.
Likewise it is not necessary to alter any of the subscriber terminals in the corresponding networks (Eurocom network and IVSN Nato network).
An extension of the communication system according to the invention to further digital or analog networks is readily possible.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the present invention which are believed to be novel, are set forth with particularity in the appended claims. The invention, together with further objects and advantages, may best be understood by reference to the following description taken in conjunction with the accompanying drawings, in the several Figures in which like reference numera
REFERENCES:
patent: 5058156 (1991-10-01), Dietze
"Application of ISDN To Interconnect Heterogeneous Switched Networks" by Najjar, IEEE Military Communications Conference Milcom 1986.
"Teilnehmersignalisierung (D-Kanal)" by Fundneider, Telcom Report Sonderheft, Diensteintegrierendes Digitalnetz ISDN, No. 8, Feb. 1985, pp. 26-30.
Marcelo Melvin
Olms Douglas W.
Siemens Aktiengesellschaft
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