JPH0517736B2 - - Google Patents

Info

Publication number
JPH0517736B2
JPH0517736B2 JP62027243A JP2724387A JPH0517736B2 JP H0517736 B2 JPH0517736 B2 JP H0517736B2 JP 62027243 A JP62027243 A JP 62027243A JP 2724387 A JP2724387 A JP 2724387A JP H0517736 B2 JPH0517736 B2 JP H0517736B2
Authority
JP
Japan
Prior art keywords
signal
level
low
capacitor
impulsive noise
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP62027243A
Other languages
English (en)
Japanese (ja)
Other versions
JPS63196146A (ja
Inventor
Sunao Ronte
Mitsuo Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anritsu Corp
Original Assignee
Anritsu Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anritsu Corp filed Critical Anritsu Corp
Priority to JP2724387A priority Critical patent/JPS63196146A/ja
Publication of JPS63196146A publication Critical patent/JPS63196146A/ja
Publication of JPH0517736B2 publication Critical patent/JPH0517736B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Monitoring And Testing Of Exchanges (AREA)
  • Noise Elimination (AREA)
JP2724387A 1987-02-10 1987-02-10 信号受信装置 Granted JPS63196146A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2724387A JPS63196146A (ja) 1987-02-10 1987-02-10 信号受信装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2724387A JPS63196146A (ja) 1987-02-10 1987-02-10 信号受信装置

Publications (2)

Publication Number Publication Date
JPS63196146A JPS63196146A (ja) 1988-08-15
JPH0517736B2 true JPH0517736B2 (enrdf_load_stackoverflow) 1993-03-10

Family

ID=12215638

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2724387A Granted JPS63196146A (ja) 1987-02-10 1987-02-10 信号受信装置

Country Status (1)

Country Link
JP (1) JPS63196146A (enrdf_load_stackoverflow)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56119506A (en) * 1980-02-26 1981-09-19 Matsushita Electric Ind Co Ltd Noise eliminating circuit
JPS57211891A (en) * 1981-06-24 1982-12-25 Fujitsu Ltd Tone detector

Also Published As

Publication number Publication date
JPS63196146A (ja) 1988-08-15

Similar Documents

Publication Publication Date Title
US5140631A (en) Apparatus and method for determining the state of a telephone line
US4958371A (en) Method and apparatus for determining when a telephone handset is off-hook
US4645883A (en) Double talk and line noise detector for a echo canceller
US4803718A (en) Hold detecting and control circuit for a key telephone system
EP1005209A2 (en) Signalling method for invoking a test mode in a network interface unit
US4066848A (en) Telephone ring detector circuit
HU182505B (en) Circuit arrangement for setting an interface up between at least one subscriber channel and a digital circuit containing switching matrix
US4156799A (en) Automatic disconnect circuit
US4056691A (en) Telephone subscriber line circuit
EP0287369B1 (en) Remote disconnection and shortcircuiting apparatus
US5218635A (en) Low-frequency alternating current signal detector, in particular for central office line interface circuits
US4468541A (en) Terminal equipment ring/ding suppression circuit
EP0489215B1 (en) Coupling device to be connected to a DCE for the connection to a public switched telephone network having a local power supply circuit for allowing the use of the local telephone, DCE and workstation including the same
US4196321A (en) Loopback test system
US4177361A (en) Signaling tone transparent echo suppressor
US4336422A (en) Toll restrictor
US6359972B1 (en) Line in use detection
US4323733A (en) Range extender with variable gain for coin telephone loops
US4152549A (en) Suppressor of spurious ringing currents for telephone apparatus
JPH0517736B2 (enrdf_load_stackoverflow)
US6519323B1 (en) Test unit for use at a network interface device
US4056690A (en) Automatic number identification in subscriber loop carrier systems
US4759050A (en) Intelligent toll telephone system and method
CA1138581A (en) Loop, dial pulse and ring trip detection circuit with capacitive shunt network
US4042786A (en) Telephone ringer circuit