BE492940A - - Google Patents

Info

Publication number
BE492940A
BE492940A BE492940DA BE492940A BE 492940 A BE492940 A BE 492940A BE 492940D A BE492940D A BE 492940DA BE 492940 A BE492940 A BE 492940A
Authority
BE
Belgium
Prior art keywords
signal
tube
pulses
discriminating
digit
Prior art date
Application number
Other languages
English (en)
French (fr)
Publication of BE492940A publication Critical patent/BE492940A/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of DC signals of alternating polarity, coded pulses or impedance dialling

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
BE492940D BE492940A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)

Publications (1)

Publication Number Publication Date
BE492940A true BE492940A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)

Family

ID=137058

Family Applications (1)

Application Number Title Priority Date Filing Date
BE492940D BE492940A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)

Country Status (1)

Country Link
BE (1) BE492940A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)

Similar Documents

Publication Publication Date Title
CA1272530A (en) Toll telephone system and method for maintaining or initiating loop current after resuming onhook condition
US4860346A (en) Telephone system and method operated from central office loop current
EP0458710B1 (fr) Système téléphonique à plusieurs terminaux téléphoniques sur une seule ligne
EP0188139B1 (fr) Système de commande et de surveillance d'un appareil téléphonique public à prépaiement
US4860345A (en) Telephone system and method operated from central office loop current
BE492940A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
US3579253A (en) Coin telephone circuit for dial-tone-first service
CA1272819A (en) Intelligent toll telephone system and method
EP0298813B1 (fr) Appareil téléphonique public à connexion permanente
US2025444A (en) Telephone system
US1830873A (en) Telephone system
US3206544A (en) Data transmission system
BE439476A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
BE482060A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
BE433724A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
BE415746A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
BE822103A (fr) Perfectionnements aux systemes telephoniques
BE530953A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
BE443971A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
JPH0137899B2 (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
CH369171A (fr) Installation de communication téléphonique à concentrateurs de lignes
BE355261A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
BE489876A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)
CH115005A (fr) Installation téléphonique.
BE337358A (c_deeref_Disk_and_Scratch_Disk_Pools_and_Their_Defaults.html)