Method of simulating an
US5805570A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1995 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | May 2, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13393
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
End-to-end call processing of an ISDN-BRI central-office switch is simulated using a polled multi-tasking method which is executed by a single microcomputer in an ISDN-BRI central-office emulator which includes (i) a packet handler, (ii) a time-space multiplexer, (iii) an in-band tone generator, and (iv) a plurality of dual-interface line modules, each of which includes a U-interface loop termination device and an S/T-interface network termination device. The method includes controlling the packet handler to simulate packet-handling functions required for ISDN signalling and ISDN data exchange, controlling the time-space multiplexer and in-band-tone generator to simulate at least one of the circuit mode voice and data connections functions of the ISDN-BRI central-office switch, and activating either the U-interface loop termination device or the S/T-interface network termination device of at least one of the dual-interface line modules. All relevant in-band call progress tones are generated by a progress tone generator circuit using a single microcomputer which (i) receives a command from an external source, (ii) determines proper inputs to a tone generator and cut-through logic ci…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.