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Line transmission systems (combined with near-field transmission systems H04B5/00) > Details

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• H04B 3/03 Hybrid circuits (for transceivers H04B1/52, H04B1/58)
• H04B 3/04 Control of transmission; Equalising
• H04B 3/20 Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
• H04B 3/26 Improving frequency characteristic by the use of loading coils
• H04B 3/28 Reducing interference caused by currents induced in cable sheathing or armouring
• H04B 3/30 Reducing interference caused by unbalanced currents in a normally balanced line
• H04B 3/32 Reducing cross-talk, e.g. by compensating
• H04B 3/36 Repeater circuits (H04B3/58 takes precedence)
• H04B 3/40 Artificial lines; Networks simulating a line of certain length
• H04B 3/42 Circuits for by-passing of ringing signals
• H04B 3/44 Arrangements for feeding power to a repeater along the transmission line
• H04B 3/46 Monitoring; Testing