IT1174568B - CIRCUIT TO ADAPT THE OUTPUT IMPEDANCE OF A TELEPHONE TO THE LINE - Google Patents

CIRCUIT TO ADAPT THE OUTPUT IMPEDANCE OF A TELEPHONE TO THE LINE

Info

Publication number
IT1174568B
IT1174568B IT21777/84A IT2177784A IT1174568B IT 1174568 B IT1174568 B IT 1174568B IT 21777/84 A IT21777/84 A IT 21777/84A IT 2177784 A IT2177784 A IT 2177784A IT 1174568 B IT1174568 B IT 1174568B
Authority
IT
Italy
Prior art keywords
adapt
telephone
circuit
line
output impedance
Prior art date
Application number
IT21777/84A
Other languages
Italian (it)
Other versions
IT8421777A1 (en
IT8421777A0 (en
Inventor
Peter Fred Blomley
Edward John Wemyss Whittaker
Original Assignee
Int Standard Electric 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
Priority claimed from GB08319222A external-priority patent/GB2154831B/en
Application filed by Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of IT8421777A0 publication Critical patent/IT8421777A0/en
Publication of IT8421777A1 publication Critical patent/IT8421777A1/en
Application granted granted Critical
Publication of IT1174568B publication Critical patent/IT1174568B/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/28—Impedance matching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/76—Compensating for differences in line impedance
IT21777/84A 1983-07-15 1984-07-06 CIRCUIT TO ADAPT THE OUTPUT IMPEDANCE OF A TELEPHONE TO THE LINE IT1174568B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08319222A GB2154831B (en) 1983-06-29 1983-07-15 Impedance matching circuit

Publications (3)

Publication Number Publication Date
IT8421777A0 IT8421777A0 (en) 1984-07-06
IT8421777A1 IT8421777A1 (en) 1986-01-06
IT1174568B true IT1174568B (en) 1987-07-01

Family

ID=10545801

Family Applications (1)

Application Number Title Priority Date Filing Date
IT21777/84A IT1174568B (en) 1983-07-15 1984-07-06 CIRCUIT TO ADAPT THE OUTPUT IMPEDANCE OF A TELEPHONE TO THE LINE

Country Status (7)

Country Link
JP (1) JPS6074732A (en)
KR (1) KR850005046A (en)
AU (1) AU3044284A (en)
ES (1) ES534300A0 (en)
FR (1) FR2549325A1 (en)
GB (1) GB2146505B (en)
IT (1) IT1174568B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6243944A (en) * 1985-08-21 1987-02-25 Toshiba Corp Telephone set circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1233955A (en) * 1967-10-23 1971-06-03
JPS5679551A (en) * 1979-12-04 1981-06-30 Hitachi Ltd Bus line termination system

Also Published As

Publication number Publication date
AU3044284A (en) 1985-01-17
GB8417828D0 (en) 1984-08-15
ES8601608A1 (en) 1985-10-16
FR2549325A1 (en) 1985-01-18
GB2146505A (en) 1985-04-17
ES534300A0 (en) 1985-10-16
IT8421777A1 (en) 1986-01-06
KR850005046A (en) 1985-08-19
IT8421777A0 (en) 1984-07-06
JPS6074732A (en) 1985-04-27
GB2146505B (en) 1987-04-15

Similar Documents

Publication Publication Date Title
FR2542548B1 (en) TELEPHONE LINE INTERFACE CIRCUIT
FR2595178B1 (en) EARPHONE OF THE TYPE TO BE USED OUTSIDE
ES513878A0 (en) "A CIRCUIT OF TELEPHONE LINE OF SUBSCRIBER".
FR2547152B1 (en) EARPHONE OF THE TYPE TO INSERT IN THE EAR
IT1138473B (en) IMPULSE MONITORING CIRCUIT
IT1193390B (en) TELEPHONE LINE CIRCUIT
IT1186394B (en) TELEPHONE LINE STATUS CIRCUIT
IT1173378B (en) CIRCUIT TO RECEIVE CALL SIGNALS ON A TELEPHONE LINE
IT1163921B (en) BUFFER BATTERY POWER CIRCUIT FOR TELEPHONE LANDER INTERFACE
IT1130749B (en) COMPLEX FOR THE APPLICATION OF SIGNALS TO A TELEPHONE LINE
ES288608Y (en) FLEXIBLE METAL COUPLING
IT1159706B (en) USER LINE ELECTRONIC TELEPHONE CIRCUIT
IT1174568B (en) CIRCUIT TO ADAPT THE OUTPUT IMPEDANCE OF A TELEPHONE TO THE LINE
IT1140161B (en) EQUIPMENT TO CHECK AND INDICATE THE INTEGRITY OF THE CONNECTION OF TELEPHONE SUBSCRIBERS TO A SWITCHING SYSTEM
IT8424133A1 (en) CONNECTION UNIT
IT1131454B (en) CONNECTION CIRCUIT FOR A TELEPHONE LINE
FR2552288B1 (en) TELEPHONE SUBSCRIBER
FR2565751B1 (en) SLAVE-TYPE INTERFACE CIRCUIT
IT8421630A0 (en) VOLUME CONTROL CIRCUIT TO ATTENUATE THE AUDIO OUTPUT OF A RECEIVING EQUIPMENT.
FR2498851B1 (en) SUBSCRIBER LINE INTERFACE CIRCUIT
IT1131453B (en) AMPLIFIER FOR USE IN A TELEPHONE LINE CIRCUIT
MX151720A (en) IMPROVEMENTS TO SUBSCRIBER LINE INTERFACE CIRCUIT
BE880144R (en) ELECTRONIC POWER BRIDGE FOR TELEPHONE LINE
BE879983A (en) ELECTRONIC POWER BRIDGE FOR TELEPHONE LINE
FR2491704B1 (en) SUPPLY CIRCUIT OF A TELEPHONE LINE