Telephonic communications – Subscriber line or transmission line interface
Patent
1994-03-14
1995-09-12
Dwyer, James L.
Telephonic communications
Subscriber line or transmission line interface
379 93, 379 94, 3701101, 370 941, 370 581, H04J 312
Patent
active
054504864
ABSTRACT:
Telecommunication systems such as PABXs are known which comprise ISDN digital linecards with a number of ISDN basic access interfaces. A telecommunication device is proposed comprising configurable ISDN digital linecards. To this end the linecards are provided with configuration means for independently configuring each ISDN basic access interface with respect to the other ISDN basic access interfaces as to mode setting and phantom power feeding to the transmission line to be coupled to the interface. The modes to be set are ISDN-NT or ISDN-TE mode. It is achieved that the PABX can be set to customer specifications without customer specific linecards having to be manufactured. Accordingly, no high manufacturing change-over costs are involved and no expensive extra documentation sets have to be drawn up, as would have been the case when many customer specific linecards would have to be manufactured.
REFERENCES:
Data Sheet for Siemens PEB 2085.
"Communication System for the Parliament of Northrhine-Westfalia (Landtag NRW)", H. Friedel et al, Philips TDS Review. vol. 46, No. 1, Mar. 1988 pp. 1-13.
CCITT "Blue Book" vol. III Fascicle III-8, Recommendations I.310.1470, CCITT IXTH Plenary Assembly, Melbourne, 14-25, Nov. 1988.
"Logic Design Principles with Emphasis on Testable Semicustom Circuits" E. J. McCluskey, Chapter 11.3, pp. 505-513.
Hesdahl Piet B.
Maas Rene
Balconi-Lamica Michael J.
Dwyer James L.
Saint-Surin Jacques M.
Schreiber David
U.S. Philips Corporation
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