GB1138259A - Multi-frequency code signalling method - Google Patents

Multi-frequency code signalling method

Info

Publication number
GB1138259A
GB1138259A GB3246567A GB3246567A GB1138259A GB 1138259 A GB1138259 A GB 1138259A GB 3246567 A GB3246567 A GB 3246567A GB 3246567 A GB3246567 A GB 3246567A GB 1138259 A GB1138259 A GB 1138259A
Authority
GB
United Kingdom
Prior art keywords
digits
sent
group
code
july
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
GB3246567A
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
Publication of GB1138259A publication Critical patent/GB1138259A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

1,138,259. Automatic exchange systems. INTERNATIONAL STANDARD ELECTRIC CORP. 14 July, 1967 [21 July, 1966], No. 32465/67. Heading H4K. In multifrequency code-signalling, e.g. between exchanges, pairs of digits are transmitted simultaneously, one in a 2-out-of-5 code, the other in a 2-out-of-6 code, 11 frequencies being employed in all. There are thus 5 surplus frequency pairs available in the second group, and these may be used in combination with 2 frequencies of the first group for supervisory and other special purposes. When signals are sent in immediate succession, as in the arrangement of Specification 1,030,188, a 4-frequency repetition signal is sent when a pair of digits are repeated. Also, when an odd number of digits are to be sent, the single final digit is supplemented by a surplus frequency pair from the second group.
GB3246567A 1966-07-21 1967-07-14 Multi-frequency code signalling method Expired GB1138259A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST025673 1966-07-21

Publications (1)

Publication Number Publication Date
GB1138259A true GB1138259A (en) 1968-12-27

Family

ID=7460650

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3246567A Expired GB1138259A (en) 1966-07-21 1967-07-14 Multi-frequency code signalling method

Country Status (4)

Country Link
BE (1) BE701598A (en)
DE (1) DE1487986A1 (en)
GB (1) GB1138259A (en)
NL (1) NL6710050A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2087710A5 (en) * 1970-05-28 1971-12-31 Cit Alcatel

Also Published As

Publication number Publication date
BE701598A (en) 1968-01-22
DE1487986A1 (en) 1969-02-20
NL6710050A (en) 1968-01-22

Similar Documents

Publication Publication Date Title
CA922408A (en) System of telecommunications whereby a number of subscribers use the available channels in common
SE318914B (en)
GB1066160A (en) Remote control system
GB1105427A (en)
CA922379A (en) Low frequency transmission in electric signaling systems
GB1138259A (en) Multi-frequency code signalling method
GB970938A (en) Automatic telecommunication exchange systems
GB1064250A (en) Code checking circuit and multifrequency data receiver
GB987291A (en) Electrical communication apparatus
GB996835A (en) Multi-frequency code signalling method
CA807313A (en) Telephone reporting system
CA809749A (en) Key telephone system signaling circuit
CA827849A (en) Telephone signal transmission system
CA810267A (en) Telephone signaling system including carrier frequency transmission on voice frequency loaded pairs
GB1097080A (en) Circuit arrangement for supervising electrical pulses transmitted over a number of channels
CS184857B1 (en) Method and connection for transmission of the binar signal sequences in the time divided communication networks
GB1269760A (en) Improvements in or relating to coin-operated telecommunications systems
GB803510A (en) Improvements in or relating to time division multiplex communication systems
AU403193B2 (en) Subscriber communication system
CA670291A (en) Telegraph signal arrangement for a telephone system
CA665980A (en) Telegraph signal arrangement for a telephone system
JPS5279705A (en) Privacy circuit in key telephone unit
CA690729A (en) Voice-frequency signal receivers as used in telephone systems
AU411776B2 (en) Improvements to telecommunication exchange line identification systems
CA792857A (en) Communication system signaling and testing equipment