Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1995-05-08
1998-02-03
Chan, Wing F.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
H04M 1100
Patent
active
057153000
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for establishing data connections in an auxiliary-exchange communications installation, in which a central modem is inserted between the terminals involved in the setting up of the connection in dependence on terminals involved in a respective connection setup.
From a special edition of "Special Issue of telcom report and Siemens Magazine COM--ISDN 1985", pages 13-24, 48-72, (Order No. A 19100-L523-V849-X7600; ISBN 3-8009-3849-9) and from German Offenlegungsschrift DE 38 27 493 A1, a communications system is known to which analog and digital telephones, telefax machines, multifunctional terminals, workstation systems, personal computers, teletex and videotext stations and data terminals can be connected.
The essential component of this communications system is a central communications computer with a system data base and at least one multi-tasking operating system. A "task" unit is here understood to be an independent executive unit which consists of an executable program and its respective execution environment, for example memory allocation, device allocation. At any time, each task unit is in one of the states "active", "waiting" or "idle"; task units can run parallel with one another by means of a multi-tasking operating system and, in practice, this can take place both by means of a number of processors operating independently of one another and by means of a single processor in a time-division multiplex process. Other essential characteristics of task units are so that they can communicate with one another via messages and can synchronize each other.
The actual circuit technology of the known digital communications system is constructed modularly in such a manner that the entire system structure is based on function modules; the connection between the modules is established by means of internal system interfaces.
Such a communications system can have differently structured terminals: thus, first subscriber stations which, on the one hand, have a telephone terminal and, on the other hand, a data terminal preceded by an analog modem and a switch-over device by means of which, either the telephone terminal or the data terminal can be connected to the analog subscriber line circuit, can be connected via analog subscriber line circuits. Furthermore, second subscriber stations comprising a telephone terminal and a data terminal which is preceded by data circuit-terminating equipment, can be connected to the communications system. A separate subscriber line circuit is in each case allocated to the telephone terminal and the data circuit-terminating equipment. Finally, third subscriber stations which consist of a data terminal and a preceding data circuit-terminating equipment can be connected to the communications system. By inserting modems, this communications system provides for data links between two first, two second, two third subscriber stations, between a second a third subscriber station and data links between an internal first, second or third subscriber station and an external subscriber station with the same structure.
SUMMARY OF THE INVENTION
The object forming the basis of the invention consists in providing extended possibilities of utilization for an auxiliary-exchange communications installation of the type initially mentioned.
According to the invention, this object is achieved by the method of the present invention for producing data connections in an auxiliary-exchange communications installation, in which a central modem is inserted between the terminals involved in the setting up of the connection in dependence on terminals involved in a respective connection setup. During the setting up of a connection originating from a terminal constructed as an ISDN terminal implementing an A/B service (fax group 2, fax group 3, data via modem, vtx via modem) or of a data transmission service (64 kbit/s), this terminal forms first service indicator information in conformity with the relevant ISDN protocol, which designates the respec
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NTZ--Nachrichtentechnische Zeitschrift 41 (1988) Mar., No. 3, Berlin, W.Germany, ISDN--Kommuniketionssysteme, "Technik und Leistungsmerkmale einer ISDN-TK-Anlage", Peter Kroeger, pp. 144-148.
TN Nachrichten (1987) No. 91, Frankfurt/W. Germany, "D-Kanal-Protokolle im ISDN und ihre Bedeutung Fur die Kommunikation", Reinald Quintenz et al, pp. 41-47.
Special Issue telcom report and Siemens Magazine COM, Dec. 1985, Siemens Aktiengesellschaft, "ISDN in the Office--HICOM, Technology and Applications of the HICOM ISDN Communication System", pp. 4-72.
Lybeer Roger
Schallier Walter
Chan Wing F.
Siemens Aktiengesellschaft
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