Pulse transformer for a u-interface operating according to the echo compensation principle, and method for the manufacture of a toroidal tape core contained in a U-interface pulse transformer
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United States of America Patent
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-
Sep 12, 2000
Grant Date -
N/A
app pub date -
Mar 17, 1999
filing date -
Sep 17, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the ISDN telecommunication system, the connection between a digital local exchange and the network termination ensues via a public two-wire line at whose ends what are referred to as U-transformers reside. When the network termination leads to a terminal subscriber, then this is called a U.sub.k0 interface whereat the line length between the transformers can amount to up to 8 km. The bit error rate of the transmitted pulses must be <10.sup.-7, whereby the pulses have direct currents for the remote feed of the terminal subscribers that can amount to up to 80 mA superimposed on them. For such U.sub.K0 transformers, a toroidal tape core of a soft-magnetic, amorphous, magnetostriction-free alloy tape is employed. The manufactured toroidal tape core is tempered in a magnetic field, this thermal treatment ensuing in a protective gas atmosphere.
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