TREA

Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange

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Industry

  • CPC
  • H04Q5/00
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Parent Industries

HELECTRICITY H04Electric communication H04QSELECTING

Current Industry

H04Q5/00Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange

Sub Industries

H04Q5/02with direct connection for all subscribers H04Q5/04Signalling by currents in one or other or both line wires or additional wires H04Q5/06Signalling by amplitude or polarity of dc H04Q5/08Signalling by continuous ac H04Q5/10using single frequencies for different subscribers H04Q5/12using combinations of frequencies H04Q5/14Signalling by pulses H04Q5/16by predetermined number of pulses H04Q5/18with indirect connection H04Q5/20the subordinate centre permitting interconnection of subscribers connected thereto H04Q5/22the subordinate centre not permitting interconnection of subscribers connected thereto H04Q5/24for two-party-line systems H04Q5/245Circuit arrangements in which for one subscriber low frequency speech and/or signalling signals proceed on the line, while for the other subscriber the low frequency speech and/or signalling signals are modulated upon a high frequency carrier signal
Industries