IPC Subgroup
H04B 3/02 Details
Introduced: September 1968
Last revised: January 2006
Full Title
Line transmission systems > Details
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TRANSMISSION
12 direct subcodes
Child Classifications
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- H04B 3/03 Hybrid circuits
- H04B 3/04 Control of transmission; Equalising
- H04B 3/2 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 3/3 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
- H04B 3/4 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