GB324094A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB324094A
GB324094A GB2978828A GB2978828A GB324094A GB 324094 A GB324094 A GB 324094A GB 2978828 A GB2978828 A GB 2978828A GB 2978828 A GB2978828 A GB 2978828A GB 324094 A GB324094 A GB 324094A
Authority
GB
United Kingdom
Prior art keywords
operates
shunts
earth
battery
relay
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
GB2978828A
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.)
Automatic Telephone Manufacturing Co Ltd
Original Assignee
Automatic Telephone Manufacturing Co Ltd
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 Automatic Telephone Manufacturing Co Ltd filed Critical Automatic Telephone Manufacturing Co Ltd
Priority to GB2978828A priority Critical patent/GB324094A/en
Publication of GB324094A publication Critical patent/GB324094A/en
Expired legal-status Critical Current

Links

Classifications

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Catching Or Destruction (AREA)

Abstract

324,094. Automatic Telephone Manufacturing Co., Ltd., Gillings, C., and Rice, T. G. Oct. 15, 1928. Automatic exchange systems. - In a hunting switch the driving magnet (or interrupter relay controlling the driving magnet) is operated in a local circuit until an idle line is found when the test wiper potential shunts the self-interrupting electromagnet and operates the switching relay. The magnet DM of the line switch (Fig. 1) is driven by self-interruption from earth at 15 in series with resistance R. When a free line is reached battery over the test wiper P shunts DM and operates K (to earth at 15) which disconnects DM and switches through. Relay K is maintained by earth returned over P via both its windings in series to battery at DM. In Fig. 2 the group. selector hunts due to the interaction of G and RM, the circuit of G being via R1 to 116. When a free circuit is found, battery on P (such as that shown at R2) shunts G and operates switching relay H. If all circuits are busy, CS operates on the eleventh step to return busy tone from BF.
GB2978828A 1928-10-15 1928-10-15 Improvements in or relating to telephone systems Expired GB324094A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2978828A GB324094A (en) 1928-10-15 1928-10-15 Improvements in or relating to telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2978828A GB324094A (en) 1928-10-15 1928-10-15 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB324094A true GB324094A (en) 1930-01-15

Family

ID=10297166

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2978828A Expired GB324094A (en) 1928-10-15 1928-10-15 Improvements in or relating to telephone systems

Country Status (1)

Country Link
GB (1) GB324094A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960472C (en) * 1953-05-01 1957-03-21 Automatic Elect Lab Checking dialer for automatic telephone systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960472C (en) * 1953-05-01 1957-03-21 Automatic Elect Lab Checking dialer for automatic telephone systems

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