Multiplex communications – Pathfinding or routing – Through a circuit switch
Reexamination Certificate
2008-10-21
2011-10-04
Kizou, Hassan (Department: 2472)
Multiplex communications
Pathfinding or routing
Through a circuit switch
C361S018000
Reexamination Certificate
active
08031705
ABSTRACT:
A bus interface unit is provided for intermediate switching in a two-wire current loop, wherein the bus interface unit has a transformer for potential-free decoupling of an alternating current signal modulated with digital receive data and/or for coupling in of an alternating current signal to be modulated with digital send data. The alternating current signal is modulated onto a direct current signal of a two-wire current loop. The bus interface unit has a bidirectional modem unit connected on the secondary side to the transformer for output of the receive data on a data bus and for input of the send data from the data bus. The transformer has two primary windings, which are interconnected such that the magnetic fields generated by the two-wire loop current flowing through it cancel each other out. A lowpass and/or a highpass filter for the alternating current signal is connected upstream from the at least one primary winding.
REFERENCES:
patent: 4888764 (1989-12-01), Haug
patent: 5084868 (1992-01-01), Kelly et al.
patent: 2008/0013226 (2008-01-01), Kirst
patent: 0 365 696 (1990-05-01), None
patent: WO 92/13411 (1992-08-01), None
Kizou Hassan
Maglo Emmanuel
Siemens Aktienegesellschaft
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