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Current supply arrangements for telephone systems
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Industry
CPC
H04M19/00
This industry / category may be too specific. Please go to a parent level for more data
Parent Industries
H
ELECTRICITY
H04
Electric communication
H04M
TELEPHONIC COMMUNICATION
Current Industry
H04M19/00
Current supply arrangements for telephone systems
Sub Industries
H04M19/001
Current supply source at the exchanger providing current to substations
H04M19/003
Arrangements for compensation of the DC flux in line transformers
H04M19/005
Feeding arrangements without the use of line transformers
H04M19/006
Circuits for increasing the range of current supply source
H04M19/008
Using DC/DC converters
H04M19/02
providing ringing current or supervisory tones
H04M19/023
by reversing the polarity of the current at the exchange
H04M19/026
Arrangements for interrupting the ringing current
H04M19/04
ringing-current generated at substation
H04M19/041
Encoding the ringing signal
H04M19/042
with variable loudness of the ringing tone
H04M19/044
according to the level of ambient noise
H04M19/045
Call privacy arrangements
H04M19/047
Vibrating means for incoming calls
H04M19/048
Arrangements providing optical indication of the incoming call
H04M19/06
Current supply source at subordinate switching centre charged from main exchange
H04M19/08
Current supply source at substation
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