GB1520233A - Tone checking device for a pcm exchange - Google Patents

Tone checking device for a pcm exchange

Info

Publication number
GB1520233A
GB1520233A GB736177A GB736177A GB1520233A GB 1520233 A GB1520233 A GB 1520233A GB 736177 A GB736177 A GB 736177A GB 736177 A GB736177 A GB 736177A GB 1520233 A GB1520233 A GB 1520233A
Authority
GB
United Kingdom
Prior art keywords
checking device
identification
period
time span
pcm exchange
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
GB736177A
Other languages
English (en)
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 GB1520233A publication Critical patent/GB1520233A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/24—Arrangements for supervision, monitoring or testing with provision for checking the normal operation
    • 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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB736177A 1976-03-16 1977-02-22 Tone checking device for a pcm exchange Expired GB1520233A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7607447A FR2345023A1 (fr) 1976-03-16 1976-03-16 Dispositif de verification des tonalites dans un centre de commutation mic

Publications (1)

Publication Number Publication Date
GB1520233A true GB1520233A (en) 1978-08-02

Family

ID=9170457

Family Applications (1)

Application Number Title Priority Date Filing Date
GB736177A Expired GB1520233A (en) 1976-03-16 1977-02-22 Tone checking device for a pcm exchange

Country Status (6)

Country Link
BE (1) BE852497A (enrdf_load_stackoverflow)
CH (1) CH620560A5 (enrdf_load_stackoverflow)
DE (1) DE2710954C2 (enrdf_load_stackoverflow)
ES (1) ES456900A1 (enrdf_load_stackoverflow)
FR (1) FR2345023A1 (enrdf_load_stackoverflow)
GB (1) GB1520233A (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2474785A1 (fr) * 1980-01-09 1981-07-31 Cit Alcatel Dispositif de controle d'un generateur numerique de signaux
DE3116576A1 (de) * 1981-04-27 1982-11-18 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Verfahren zum betreiben eines digitalen hoertongenerators
DE3229438A1 (de) * 1982-08-06 1984-02-09 Siemens AG, 1000 Berlin und 8000 München Verfahren zur ueberwachung eines digitalen tongenerators
DE3325290A1 (de) * 1983-07-13 1985-01-24 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur sperrung von durch eine teilnehmerstation eines digitalen zeitmultiplex-fernsprechvermittlungssystems gelieferten sprachinformationen in abgehender uebertragungsrichtung

Also Published As

Publication number Publication date
DE2710954C2 (de) 1984-05-30
ES456900A1 (es) 1978-02-16
DE2710954A1 (de) 1977-09-29
FR2345023A1 (fr) 1977-10-14
FR2345023B1 (enrdf_load_stackoverflow) 1981-09-04
BE852497A (fr) 1977-09-16
CH620560A5 (en) 1980-11-28

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee