Telecommunication system and method for implementing an ISDN PBX interface

• US 6,345,091 B1
• Filed: 08/17/2000
• Issued: 02/05/2002
• Est. Priority Date: 02/19/1998
• Status: Expired due to Term

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Networks (Nokia Corporation)
• Inventors: Lampola, Pekka, Vernooij, Antonius
• Primary Examiner(s): SMITH, CREIGHTON H
• Application Number:
  US09/641,381
• Time in Patent Office: 537 Days
• Field of Search: 379/225, 379/219, 379/220.01, 379/224, 379/229, 379/231, 379/234
• US Class Current: 379/225
• CPC Class Codes: H04Q 11/0464 Primary rate access circuits
• CPC Class Codes: H04Q 2213/13176 Common channel signaling, CCS7
• CPC Class Codes: H04Q 2213/13205 Primary rate access, PRI
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/1322 PBX

Abstract

An ISDN telecommunication system and a method for implementing a private branch exchange interface. The system comprises an ISDN exchange (1), a primary rate interface (2), a PBX interface (3) and an ISDN PBX (4) provided with a multi-channelling device (6) for dividing the primary rate interface (2) into at least two PBX interfaces (3, 3′). In the invention, a B channel in the primary rate interface is converted into a D channel, which is used in the PBX interface (3, 3′). On the other hand, the information in the D channel of the primary rate interface (2) can be used and is distributed between the PBX interfaces (3, 3′).

Claims

1. Telecommunication system comprising a telephone exchange (1) provided with ISDN properties, including an information channel B and a signalling channel D, a primary rate interface (2) connected to the telephone exchange (1), a private branch exchange interface (3) communicating with the telephone exchange (1), and an ISDN private branch exchange (4) connected to the telephone exchange via the PBX interface, characterised in that the system comprises means (6) for dividing the primary rate interface (2) into at least two PBX interfaces (3, 3′

).

2. System as defined in claim 1, characterised in that the system comprises means for converting a B channel in the primary rate interface (2) into a D channel.

3. System as defined in claim 1, characterised in that the means (6) for dividing the primary rate interface are implemented in a multi-channelling device.

4. System as defined in claim 1, characterised in that, in the system, the B channel is in the same time slot in the PBX interface (3) and in the primary rate interface (2).

5. System as defined in claim 1, characterised in that the system comprises means for removing the D channel converted from a B channel of the primary rate interface (2) into time slot no. 16 of the PBX interface (3).

6. System as defined in claim 1, characterised in that the system comprises means (6) for distributing the messages transmitted in the D channel of the primary rate interface (2) into the D channels in the PBX interfaces (3, 3′

).

7. Method for implementing a private branch exchange interface in a telecommunication system comprising a telephone exchange (1) provided with ISDN properties, including an information channel B and a signalling channel D, a private branch exchange interface (3) communicating with the telephone exchange (1), and an ISDN private branch exchange (4) connected to the telephone exchange (1) via the PBX interface (3), characterised in that the primary rate interface (2) is divided into at least two PBX interfaces (3, 3′

).

8. Method as defined in claim 7, characterised in that one of the B channels in the primary rate interface (2) is converted into a D channel.

9. Method as defined in claim 7, characterised in that the B channel is transmitted in the same time slot in the PBX interface (3) and in the primary rate interface (2).

10. Method as defined in claim 7, characterised in that the D channel converted from a B channel of the primary rate interface (2) is transmitted in time slot no. 16 of the PBX interface (3).

11. Method as defined in claim 7, characterised in that the information in the D channel of the primary rate interface (2) is distributed into the D channels of the PBX interfaces (3, 3′

).