Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Espana SAfiledCriticalAlcatel Espana SA
Publication of ES177444A1publicationCriticalpatent/ES177444A1/es
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/738—Interface circuits for coupling substations to external telephone lines
H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
H04M1/745—Protection devices or circuits for voltages surges on the line
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Interface Circuits In Exchanges
(AREA)
Devices For Supply Of Signal Current
(AREA)
Telephone Function
(AREA)
ES0177444A1939-12-091947-03-31Circuito para aparatos telefonicos de abonados
ExpiredES177444A1
(es)