GB1172166A - Telephone Exchange - Google Patents

Telephone Exchange

Info

Publication number
GB1172166A
GB1172166A GB651867A GB651867A GB1172166A GB 1172166 A GB1172166 A GB 1172166A GB 651867 A GB651867 A GB 651867A GB 651867 A GB651867 A GB 651867A GB 1172166 A GB1172166 A GB 1172166A
Authority
GB
United Kingdom
Prior art keywords
extension
operator
link
reply
alarm
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
GB651867A
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
Priority claimed from NL6706643A external-priority patent/NL6706643A/xx
Publication of GB1172166A publication Critical patent/GB1172166A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/42Systems providing special services or facilities to subscribers
    • H04M3/432Arrangements for calling a subscriber at a specific time, e.g. morning call service

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

1,172,166. Automatic exchange systems. INTERNATIONAL STANDARD ELECTRIC CORP. 10 Feb., 1967 [11 Feb., 1966], No. 6518/67. Heading H4K. In a PABX, special links are provided for allowing an operator to set up a connection between an extension and a pre-recordedannouncement machine (e.g. morning alarm call), the operator withdrawing from the connections as soon as it is set-up without waiting for the extension to reply. The link includes a timing circuit which initiates an alarm if the extension does not reply within a preset period. On closing her keys AB and TW at the operator's position AP, relays E and WKI come up in the link AUe. The operator causes operation of the selectors, e.g. W1 and ringing current is sent when the idle called extension is reached. Wk holds over its second winding when the keys are released (after flickering illumination of busy lamp BL) and the magnetic tape announcement machine AG is preparatorily coupled (a still open) via wk5 to the third winding of the link isolation transformer. When the extension replies his line relay A comes up to complete the connection between AG and the transformer. When the extension replaces his handset, a release relay TR comes up to release the link. Timer ZG energizes alarm lamp Al if the extension does not reply within a set time. The operator may use the link for outgoing dialling signals (Z operated) or for an incoming call (e2 operated) while it is in use for automatically calling the extension.
GB651867A 1966-02-11 1967-02-10 Telephone Exchange Expired GB1172166A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1966ST024985 DE1257873B (en) 1966-02-11 1966-02-11 Circuit arrangement for telephone systems, in particular private branch exchanges, in which an exchange can connect to a subscriber via the coupling elements of the system
NL6706643A NL6706643A (en) 1967-05-12 1967-05-12

Publications (1)

Publication Number Publication Date
GB1172166A true GB1172166A (en) 1969-11-26

Family

ID=25994386

Family Applications (1)

Application Number Title Priority Date Filing Date
GB651867A Expired GB1172166A (en) 1966-02-11 1967-02-10 Telephone Exchange

Country Status (3)

Country Link
BE (1) BE698893A (en)
DE (1) DE1257873B (en)
GB (1) GB1172166A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777065A (en) * 1971-06-30 1973-12-04 Total Syst Corp Calling system utilizing a telephone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777065A (en) * 1971-06-30 1973-12-04 Total Syst Corp Calling system utilizing a telephone

Also Published As

Publication number Publication date
DE1257873B (en) 1968-01-04
BE698893A (en) 1967-11-24

Similar Documents

Publication Publication Date Title
CA2302549A1 (en) Telephonic system with call forwarding apparatus and method
GB1404166A (en) Switching systems
US3557318A (en) Apartment house telephone system
GB973717A (en) Automatic telecommunication exchange
GB1172166A (en) Telephone Exchange
GB1518537A (en) Line circuit for telecommunications exchange using tdm
JPS6419842A (en) Outgoing/incoming call control system for mobile communication system
JPS5613864A (en) Sending system of calling station name talkie
JPS6129183B2 (en)
SE317409B (en)
JPS5563162A (en) Subscriber line call signal transmission system
JPS59154864A (en) Absence calling connection processing system
JPS5752257A (en) Calling control system
JPS5513571A (en) Absent subscriber calling system
JPS588789B2 (en) Call waiting method
JPS60165193A (en) Decentralized attendant board system of private branch of automatic exchange
JPS6077566A (en) Automatic callback system by additional dial
JPS5690667A (en) Automatic transfer system for incoming call
JPS56103564A (en) Paging transfer system
JPS5689162A (en) Number change guide system
JPS57132496A (en) Night transfer set
JPS5627556A (en) Call transfer system
JPS6024755A (en) Service system for supporting international telephone subscriber
JPS56137764A (en) Trunk incoming call answer system
JPH03145856A (en) Message display system

Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PLNP Patent lapsed through nonpayment of renewal fees