GB1400630A - Telecommunications exchange systems - Google Patents

Telecommunications exchange systems

Info

Publication number
GB1400630A
GB1400630A GB4935572A GB4935572A GB1400630A GB 1400630 A GB1400630 A GB 1400630A GB 4935572 A GB4935572 A GB 4935572A GB 4935572 A GB4935572 A GB 4935572A GB 1400630 A GB1400630 A GB 1400630A
Authority
GB
United Kingdom
Prior art keywords
contact
relay
digit
frequency
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
GB4935572A
Other languages
English (en)
Inventor
W Fath
W Laubinger
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.)
Siemens Corp
Original Assignee
Siemens 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 Siemens Corp filed Critical Siemens Corp
Publication of GB1400630A publication Critical patent/GB1400630A/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
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Function (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)
GB4935572A 1971-10-29 1972-10-26 Telecommunications exchange systems Expired GB1400630A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712154078 DE2154078C3 (de) 1971-10-29 1971-10-29 Schaltungsanordnung für sprachgeschützte frequenzselektive Wählkennzeichenempfänger in Fernmelde-, insbesondere Fernsprechanlagen

Publications (1)

Publication Number Publication Date
GB1400630A true GB1400630A (en) 1975-07-16

Family

ID=5823799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4935572A Expired GB1400630A (en) 1971-10-29 1972-10-26 Telecommunications exchange systems

Country Status (10)

Country Link
AT (1) AT323242B (enrdf_load_stackoverflow)
BE (1) BE790656A (enrdf_load_stackoverflow)
CH (1) CH545568A (enrdf_load_stackoverflow)
DE (1) DE2154078C3 (enrdf_load_stackoverflow)
FR (1) FR2159024A5 (enrdf_load_stackoverflow)
GB (1) GB1400630A (enrdf_load_stackoverflow)
IT (1) IT969934B (enrdf_load_stackoverflow)
LU (1) LU66383A1 (enrdf_load_stackoverflow)
NL (1) NL7214616A (enrdf_load_stackoverflow)
SE (1) SE377417B (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
DE2154078B2 (de) 1978-11-16
DE2154078A1 (de) 1973-05-03
BE790656A (fr) 1973-04-27
FR2159024A5 (enrdf_load_stackoverflow) 1973-06-15
NL7214616A (enrdf_load_stackoverflow) 1973-05-02
SE377417B (enrdf_load_stackoverflow) 1975-06-30
DE2154078C3 (de) 1979-07-19
LU66383A1 (enrdf_load_stackoverflow) 1973-01-23
IT969934B (it) 1974-04-10
AT323242B (de) 1975-06-25
CH545568A (enrdf_load_stackoverflow) 1974-01-31

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Legal Events

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