GB1179781A - Telephone Exchange System with Automatic Operation over a Carrier-Frequency Section - Google Patents

Telephone Exchange System with Automatic Operation over a Carrier-Frequency Section

Info

Publication number
GB1179781A
GB1179781A GB534267A GB534267A GB1179781A GB 1179781 A GB1179781 A GB 1179781A GB 534267 A GB534267 A GB 534267A GB 534267 A GB534267 A GB 534267A GB 1179781 A GB1179781 A GB 1179781A
Authority
GB
United Kingdom
Prior art keywords
over
sub
band
exchange
gate
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
GB534267A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1179781A publication Critical patent/GB1179781A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/16—Arrangements for interconnection between switching centres in systems employing carrier frequencies

Abstract

1,179,781. Automatic exchange systems. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. 3 Feb., 1967 [4 Feb., 1966], No. 5342/67. Heading H4K. Sub-stations seize an exchange circuit over a carrier-frequency link by an in-band frequency pulse and send dialled digits as trains of outband frequency pulses. Sub-stations are rung in response to an out-band frequency ringing signal from the exchange. A carrier frequency link TF between a sub-station T and exchange A terminates in go and return out-band signal paths S2 and a two-way speech path F2 which is connected to the sub-station over a feedbridge 3. Line current through the bridge is monitored by a device 4. In response to a 3À85 kc/s. signal from 1, ringing voltage is supplied to the sub-station T over contact r. Closure of the line loop in reply switches monostable device 5 after a 150 ms. delay during which AND gate 6 opens to effect transmission of a 2À85 kc/s. in-band pulse over F2. An exchange receiver 7 responds and switches bistable device 10 over its input E1; AND gate 11 opens to operate relay S which extends the subscriber's line over S1 and S2. Device 4 follows dialling impulses and repeatedly opens AND gate 9 to transmit trains of 3À85 kc/s. out-band pulses, each pulse opening AND gate 11 and releasing relay S which thereby repeats the dialling impulses at S1. Upon the calling subscriber T hanging up monostable device 5 switches back after a delay of 800 ms.; the consequent 800 ms. 3À85 kc/s. pulse switches bi-stable device 10 to release relay S.
GB534267A 1966-02-04 1967-02-03 Telephone Exchange System with Automatic Operation over a Carrier-Frequency Section Expired GB1179781A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1966T0030396 DE1258914B (en) 1966-02-04 1966-02-04 Method for connecting subscriber stations to a telephone exchange with dialer operation via a carrier frequency path

Publications (1)

Publication Number Publication Date
GB1179781A true GB1179781A (en) 1970-01-28

Family

ID=7555554

Family Applications (1)

Application Number Title Priority Date Filing Date
GB534267A Expired GB1179781A (en) 1966-02-04 1967-02-03 Telephone Exchange System with Automatic Operation over a Carrier-Frequency Section

Country Status (4)

Country Link
AT (1) AT262388B (en)
CH (1) CH455887A (en)
DE (1) DE1258914B (en)
GB (1) GB1179781A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7978427B2 (en) 2006-03-10 2011-07-12 International Business Machines Corporation Device for embedding information into data

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE4363T1 (en) * 1979-05-07 1983-08-15 Autophon A.G. SYSTEM FOR THE WIRELESS TRANSMISSION OF TELEPHONE CALLS WITH A NUMBER OF RADIO CHANNELS LOWER THAN THE NUMBER OF SUBSCRIPTION STATIONS.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE551638A (en) * 1955-10-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7978427B2 (en) 2006-03-10 2011-07-12 International Business Machines Corporation Device for embedding information into data

Also Published As

Publication number Publication date
DE1258914B (en) 1968-01-18
CH455887A (en) 1968-05-15
AT262388B (en) 1968-06-10

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees