H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/66
H04M 7/00 (2006.01) H04B 1/58 (2006.01)
Patent
CA 1206647
ABSTRACT OF THE DISCLOSURE A telecommunications terminal with provision for automatic switching from 4-wire to 2-wire operation is pro- vided with a voltage sensing circuit sensing the way in which DC voltage is fed to the terminal, and in response thereto controlling switches which switch the terminal to prevailing operation conditions.
445322
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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