Title:
ON-HOOK TRANSMISSION CIRCUIT FOR WIRED LINE
Document Type and Number:
Japanese Patent JPH05130650
Kind Code:
A
Abstract:
PURPOSE: To provide an on-hook transmission circuit preventing the generation of defective operation in a subscriber's terminal.
CONSTITUTION: The on-hook transmission circuit is provided with bias parts respectively connected to the 1st and 2nd lines 1, 2, a constant current source 5 connected in parallel with the lines l, 2, a control signal input part 5a connected to the current source 5, a loop monitoring part 6 for inputting signals from the bias parts 3, 4, and a scanning signal part SCN and constitute so that current source 5 allows to current to flow between the 1st and 2nd lines 1, 2 only when a signal commanding the setting of the on-hook transmission state is inputted from the input part 5a.
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Inventors:
YAMAMOTO YUZO
ITO SHINICHI
ITO SHINICHI
Application Number:
JP29025991A
Publication Date:
May 25, 1993
Filing Date:
November 07, 1991
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
H04M19/00; H04M1/60; H04M3/00; H04M19/02; H04Q3/42; H04M3/22; (IPC1-7): H04M19/00; H04M19/02; H04Q3/42
Attorney, Agent or Firm:
Teiichi