Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Reexamination Certificate
2001-01-24
2008-11-04
Singh, Ramnandan (Department: 2614)
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
Reexamination Certificate
active
07447305
ABSTRACT:
A filter (45) is passive and has a complex impedance which gives good impedance matching to the complex impedance of a transmission line. Because the filter is passive, it does not need to be powered and can thus be placed in locations that lack a power supply. The filter can also function in the event of a power failure. Because the filter has an impedance which can be well matched to the complex impedance of a transmission line, problems relating to echo and side tones can be minimized.
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Singh Ramnandan
Telefonaktiebolaget LM Ericsson (publ)
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