GB1489742A - Telecommunication system networks - Google Patents

Telecommunication system networks

Info

Publication number
GB1489742A
GB1489742A GB1535777A GB1535777A GB1489742A GB 1489742 A GB1489742 A GB 1489742A GB 1535777 A GB1535777 A GB 1535777A GB 1535777 A GB1535777 A GB 1535777A GB 1489742 A GB1489742 A GB 1489742A
Authority
GB
United Kingdom
Prior art keywords
circuit
hybrid
path
wire
testing
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
GB1535777A
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Priority to GB1535777A priority Critical patent/GB1489742A/en
Publication of GB1489742A publication Critical patent/GB1489742A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Abstract

1489742 Testing line transmission systems POST OFFICE 17 Oct 1974 [17 July 1973] 15357/77 Divided out of 1489741 Heading H4R The description is substantially the same as that of parent Specification 1,489,741, but the claims relate to the testing of that part of a 4-wire, 2-way telecommunications circuit which is terminated by a hybrid junction, To perform the test, the hybrid is first unbalanced, e.g. by the opening of contact 33. Next, a test signal, preferably a digitally encoded VF tone, is transmitted on one path 37 of the 4-wire circuit towards the hybrid. Finally the other path 36 of the circuit is monitored, receipt of the signal thereon verifying circuit continuity.
GB1535777A 1974-10-17 1974-10-17 Telecommunication system networks Expired GB1489742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1535777A GB1489742A (en) 1974-10-17 1974-10-17 Telecommunication system networks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1535777A GB1489742A (en) 1974-10-17 1974-10-17 Telecommunication system networks

Publications (1)

Publication Number Publication Date
GB1489742A true GB1489742A (en) 1977-10-26

Family

ID=10057737

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1535777A Expired GB1489742A (en) 1974-10-17 1974-10-17 Telecommunication system networks

Country Status (1)

Country Link
GB (1) GB1489742A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2399775A1 (en) * 1977-08-05 1979-03-02 Int Standard Electric Corp CONTINUITY TEST DEVICE FOR TELECOMMUNICATIONS SYSTEM

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2399775A1 (en) * 1977-08-05 1979-03-02 Int Standard Electric Corp CONTINUITY TEST DEVICE FOR TELECOMMUNICATIONS SYSTEM

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19941016