GB1513465A - Line testing circuit for switching system - Google Patents

Line testing circuit for switching system

Info

Publication number
GB1513465A
GB1513465A GB3836175A GB3836175A GB1513465A GB 1513465 A GB1513465 A GB 1513465A GB 3836175 A GB3836175 A GB 3836175A GB 3836175 A GB3836175 A GB 3836175A GB 1513465 A GB1513465 A GB 1513465A
Authority
GB
United Kingdom
Prior art keywords
circuit
line
condition
output
sept
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
Application number
GB3836175A
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.)
International Standard Electric Corp
Original Assignee
International 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
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1513465A publication Critical patent/GB1513465A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Abstract

1513465 Loop detectors INTERNATIONAL STANDARD ELECTRIC CORP 18 Sept 1975 [24 Sept 1974] 38361/75 Heading H4K A loop detecting arrangement for monitoring the condition of a line circuit CE includes an interrogation circuit CI which applies an interrogation pulse to CE and a reading circuit CL which receives the resultant output from CE and whose differential amplifier T1, 2 produces a 0/1 or 1/0 output combination on leads CS1/2 according to the looped/unlooped condition of line L g . The circuits CI and CL are multipled to a plurality of line circuits to form a scanning system. Each pulse combination output on leads CS1/2 hence relates to a different line circuit, and the condition of each line circuit is stored in circuit CS.
GB3836175A 1974-09-24 1975-09-18 Line testing circuit for switching system Expired GB1513465A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7432118A FR2286573A1 (en) 1974-09-24 1974-09-24 EXPLORATION CIRCUIT FOR SWITCHING SYSTEM

Publications (1)

Publication Number Publication Date
GB1513465A true GB1513465A (en) 1978-06-07

Family

ID=9143363

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3836175A Expired GB1513465A (en) 1974-09-24 1975-09-18 Line testing circuit for switching system

Country Status (5)

Country Link
BE (1) BE833739A (en)
BR (1) BR7505686A (en)
ES (1) ES441228A1 (en)
FR (1) FR2286573A1 (en)
GB (1) GB1513465A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2938946A1 (en) * 1979-09-26 1981-04-09 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENT FOR PREVENTING THE DISADVANTIC EFFECT OF AC VOLTAGE SHARES WHEN REGISTERING THE SWITCHING STATE IN A PARTICULAR CIRCUIT CIRCUIT FORMED BY TELEPHONE CONNECTION LINES IN TELEPHONE SWITCHING SYSTEMS
DE2938981A1 (en) * 1979-09-26 1981-04-30 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENT FOR REGISTERING THE SWITCHING STATE IN PARTICULARLY A CIRCUIT FORMED BY SUBSCRIBER CONNECTION LINES OF TELEPHONE SWITCHING SYSTEMS

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE754235A (en) * 1969-08-05 1970-12-31 Western Electric Co SUPERVISION CIRCUIT FOR TELEPHONE LINES
FR2158619A5 (en) * 1971-10-26 1973-06-15 Constr Telephoniques

Also Published As

Publication number Publication date
BE833739A (en) 1976-03-24
FR2286573A1 (en) 1976-04-23
BR7505686A (en) 1978-01-10
FR2286573B1 (en) 1979-02-16
ES441228A1 (en) 1977-03-16

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee