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This page displays all 「FI」 in main group H04M19/00. |
HB:Handbook | ||||
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CC:Concordance | |||||
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Current supply arrangements for telephone systems (for selecting equipment H04Q 1/28) | HB | CC | 5K037 | |
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.power supply for supply of current in switch for supplying current to substation | HB | CC | 5K037 | |
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..DC flux correction device in line transformer | HB | CC | 5K037 | |
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..feeding device not using line transformer | HB | CC | 5K037 | |
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..range expansion circuit for power supply for supply of current | HB | CC | 5K037 | |
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..use DC/DC converter (DC/DC converter per se H02M3/28) | HB | CC | 5K037 | |
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.providing ringing current or supervisory tones, e.g. dialling tone or busy tone | HB | CC | 5K037 | |
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..the ringing-current being generated at the substations | HB | CC | 5K037 | |
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.in which current supply sources at subordinate switching centres arecharged from the main exchange | HB | CC | 5K037 | |
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.with current supply sources at the substations (generating ringing current H04M 19/04) [1,7] | HB | CC | 5K037 | |
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..not use current of circuit | HB | CC | 5K037 | |