Multiplex communications – Wide area network – Packet switching
Patent
1989-06-28
1992-04-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 13, 3701051, 371 54, H04J 306, H04J 314, H04L 704
Patent
active
051054221
ABSTRACT:
In the ISDN system complex line adapting circuits are provided on the two sides of the transmission line and they handle an extensive protocol. These circuits are divided into two sub-circuits connected to one another over fixed interfaces. The sub-circuit which is located nearest to the transmission line, however, is to have a considerably varying structure depending on the transmitting medium. For a modular structure it is now proposed to subdivide this sub-circuit into two partial circuits interconnected over a newly created simple binary interface. Thus, only the partial circuit which is located nearest to the transmission line needs to be specifically designed for the transmitting medium, for example, glass fibre lines, whereas the protocol management is performed in the other partial circuit, which always has the same structure irrespective of the transmitting medium. In addition, an efficient frame structure of the newly created binary interface is devised, wherein the data supplied by the other sub-circuit are converted and also the transmission error messages are processed.
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patent: 4597073 (1986-06-01), Staples
patent: 4607364 (1986-08-01), Neumann et al.
patent: 4730302 (1988-03-01), Fuerlinger et al.
patent: 4792800 (1988-12-01), Fujioka
patent: 4794595 (1988-12-01), Ohyama
patent: 4965795 (1990-10-01), Coffelt et al.
Siemens, "ICs for Telecommunications".
Meyer Franz X.
Noll Joachim J.
Riekmann Dieter A. H.
Barschall Anne E.
Hsu Alpus H.
Olms Douglas W.
U.S. Philips Corporation
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