GB357568A - Improvements in call metering in automatic and semiautomatic telephone systems - Google Patents

Improvements in call metering in automatic and semiautomatic telephone systems

Info

Publication number
GB357568A
GB357568A GB18990/30A GB1899030A GB357568A GB 357568 A GB357568 A GB 357568A GB 18990/30 A GB18990/30 A GB 18990/30A GB 1899030 A GB1899030 A GB 1899030A GB 357568 A GB357568 A GB 357568A
Authority
GB
United Kingdom
Prior art keywords
relay
operates
metering
resistance
winding
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
GB18990/30A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB357568A publication Critical patent/GB357568A/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)
  • Meter Arrangements (AREA)

Abstract

357,568. Automatic exchange systems. TELEFONAKTIEBOLAGET L. M. ERICSSON, 33, Kungsgatan, Stockholm. June 21, 1930, No. 18990. Convention date, June 28, 1929. [Class 40 (iv).] At a first group selector, partial operation of a two-step relay holds the release relay and full operation thereof, on response of the called party or at the end of conversation, effects metering. Repeated metering impulses may be sent in accordance with the destination of the call. Release relay HR is operated by line relay IR, and when switching relay PR operates, an ineffective circuit is completed for two-step relay SR which is differentially wound, RR pulls up in place of IR and operates TR which directly short circuits the upper winding of SR but, as resistance R is in series with the lower winding, this relay partially operates and closes contacts 10 to hold release relay HR. Relay RR repeats impulses in a loop circuit over the junction. When metering relay MR is operated in any known manner, the lower winding of SR and resistance R are short circuited and SR operates fully over its upper winding to complete the circuit of meter SM. When the calling party replaces his receiver RR falls back and releases TR so that SR falls back and releases HR. The two step relay may have a single winding in series with a resistance which is short-circuited by MR, and may be provided with two armatures operated by currents of different strengths.
GB18990/30A 1929-06-28 1930-06-21 Improvements in call metering in automatic and semiautomatic telephone systems Expired GB357568A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE357568X 1929-06-28

Publications (1)

Publication Number Publication Date
GB357568A true GB357568A (en) 1931-09-21

Family

ID=20308830

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18990/30A Expired GB357568A (en) 1929-06-28 1930-06-21 Improvements in call metering in automatic and semiautomatic telephone systems

Country Status (1)

Country Link
GB (1) GB357568A (en)

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