GB823190A - Two-wire two-way time division multiplex system - Google Patents

Two-wire two-way time division multiplex system

Info

Publication number
GB823190A
GB823190A GB3884457A GB3884457A GB823190A GB 823190 A GB823190 A GB 823190A GB 3884457 A GB3884457 A GB 3884457A GB 3884457 A GB3884457 A GB 3884457A GB 823190 A GB823190 A GB 823190A
Authority
GB
United Kingdom
Prior art keywords
impedance
negative
pulses
channel
condensers
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
GB3884457A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB823190A publication Critical patent/GB823190A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/16—Control of transmission; Equalising characterised by the negative-impedance network used
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/20—Time-division multiplex systems using resonant transfer

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

823,190. Automatic exchange systems; two-way transmission systems. STANDARD TELEPHONES & CABLES Ltd. Dec. 13, 1957 [Dec. 19, 1956], No. 38844/57. Class 40 (4). In a two-way time-division multiplex a negative impedance amplifier is included in the transmission path. In the exchange system shown, Fig. 1, a channel such as F1 is interconnected with a channel such as F1<1> by causing the energies of the respective channels to be stored on condensers CS1, CS1<1> and causing interchange of the stored energy periodically by closing switches S1 Sh, S1<1> in synchronism, inductance Lh being provided in the common path HW to ensure a complete transfer between the condensers. Each channel is provided with a low-pass filter such as L1/2, C1, L1/2. Other connections may be set up simultaneously over the same highway by using interleaved trains of pulses to the appropriate switches. The energy lost in the switches and inductance is made up (and possibly even an amplification is effected) by the provision of a negative impedance - R in the common path HW. The impedance of the device used may only take on a negative real part in the frequency range to be transmitted and preferably presents a through path to D.C. The transmission band-width of the device should be sufficient to ensure the complete dissipation of energy stored therein in the intervals between pulses. The device must also be open-circuit stable. Special arrangements may be provided for discharging the storage condensers between pulses. Fig. 4 illustrates a suitable device which produces at terminals K an impedance which is a negative version of the impedance R.
GB3884457A 1956-12-19 1957-12-13 Two-wire two-way time division multiplex system Expired GB823190A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST12040A DE1115315B (en) 1956-12-19 1956-12-19 Two-wire two-way time selection system using pulse amplitude modulation

Publications (1)

Publication Number Publication Date
GB823190A true GB823190A (en) 1959-11-04

Family

ID=7455602

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3884457A Expired GB823190A (en) 1956-12-19 1957-12-13 Two-wire two-way time division multiplex system

Country Status (4)

Country Link
BE (1) BE563338A (en)
DE (1) DE1115315B (en)
GB (1) GB823190A (en)
NL (2) NL107975C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1226660B (en) * 1963-04-29 1966-10-13 Siemens Ag Circuit arrangement for the pulsed transmission of messages in time-division multiplex telecommunications, in particular telephone switching systems
GB1052828A (en) * 1963-04-29
GB1057376A (en) * 1963-10-14 1967-02-01 Cons Electrodynamics Corp Improvements in or relating to electrical amplifying apparatus
US3444326A (en) * 1964-12-24 1969-05-13 Bell Telephone Labor Inc Time division switching circuit

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE430965C (en) * 1926-06-26 Siemens & Halske Akt Ges Intermediate amplifier circuit for telephone lines
DE548714C (en) * 1927-04-01 1932-04-18 Erich Habann Dr Method for reducing the ohmic losses in lines operated with low-frequency or high-frequency alternating current for telegraphy and telephony
US1776310A (en) * 1928-05-19 1930-09-23 American Telephone & Telegraph Two-way negative-impedance repeater
BE471750A (en) * 1946-03-08
NL139275B (en) * 1947-03-18 Stork Amsterdam DEVICE FOR COLLECTING THE BOTTOM OF A STACK OF FLAT FLEXIBLE OBJECTS.
BE497800A (en) * 1949-08-30

Also Published As

Publication number Publication date
NL107975C (en)
NL223366A (en)
DE1115315B (en) 1961-10-19
BE563338A (en)

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