Theme -Code-Choice

On this page, you can select 5K 「theme code」.

Select the desired 「Theme code」.

  • 5K002
  • Optical transmission systems
  • 5K004
  • Digital transmission methods that use modulated carrier waves
  • 5K011
  • TRANSCEIVERS
  • 5K012
  • NEAR-FIELD TRANSMISSION SYSTEMS
  • 5K014
  • DETECTION AND PREVENTION OF ERRORS IN TRANSMISSION
  • 5K015
  • Special services by an exchange (I)
  • 5K016
  • Structure of receivers
  • 5K017
  • Broadcast distribution systems
  • 5K018
  • Bidirectional digital transmission
  • 5K019
  • MONITORING AND TESTING OF EXCHANGES
  • 5K020
  • Superheterodyne receivers
  • 5K021
  • Improvement of the reliability of transmission methods
  • 5K022
  • MULTIPLEX COMMUNICATION SYSTEMS OTHER THAN TIME-DIVISION SYSTEMS
  • 5K023
  • TELEPHONE SET STRUCTURE
  • 5K024
  • Special services for exchanges 2
  • 5K025
  • Meter arrangements
  • 5K026
  • Exchange systems with centralized control
  • 5K027
  • TELEPHONE CIRCUITS
  • 5K028
  • Time-division multiplex systems
  • 5K029
  • DC digital transmission
  • 5K030
  • Data exchanges in wide-area networks
  • 5K031
  • Loop systems in small-scale networks
  • 5K032
  • Bus systems in small-scale networks
  • 5K033
  • SMALL-SCALE NETWORKS (3): OTHER THAN LOOPS OR BUSES
  • 5K034
  • COMMUNICATION CONTROL
  • 5K035
  • Maintenance and management of digital transmission
  • 5K036
  • Display and transmission of telephone numbers
  • 5K037
  • DEVICES FOR SUPPLY OF SIGNAL CURRENT
  • 5K038
  • INTERCONNECTED COMMUNICATION SYSTEMS, INTERCOMS, AND INTERPHONES
  • 5K039
  • Automatic arrangements for answering calls
  • 5K040
  • Prepayment telephone systems (i.e., public telephones)
  • 5K041
  • Transmission systems not characterized by the medium used for transmission
  • 5K042
  • Monitoring and testing of transmission in general
  • 5K043
  • Telegraph systems
  • 5K044
  • Party-line telephone systems
  • 5K045
  • Manual exchange control systems
  • 5K046
  • CABLE TRANSMISSION SYSTEMS, EQUALIZATION OF RADIO AND REDUCTION OF ECHO
  • 5K047
  • SYNCHRONISATION IN DIGITAL TRANSMISSION SYSTEMS
  • 5K048
  • Selective calling equipment (for remote control and measurement)
  • 5K049
  • Sub-exchange stations and push- button telephones
  • 5K050
  • Interface circuits in exchanges
  • 5K051
  • Telephone exchanges
  • 5K052
  • Noise elimination
  • 5K053
  • Multi-button type push-button tuners
  • 5K054
  • Details of transmission, special-medium transmission system
  • 5K055
  • Selection arrangement in general, power supply
  • 5K056
  • Party-line exchange control systems
  • 5K057
  • Adjustment, driving and indication of resonant circuits in general
  • 5K058
  • Continuous tuning
  • 5K059
  • Diversity systems for radio transmission
  • 5K060
  • Transmitters
  • 5K061
  • Circuits of receivers in general
  • 5K062
  • Input circuits of receivers and coupling of receivers and audio equipment
  • 5K063
  • Operator exchange control systems
  • 5K064
  • Transmission and reception of signals in exchanges
  • 5K065
  • Call-channel selection, storing of information on calling or called subscribers, and translation from the called-subscriber number to outgoing control information
  • 5K066
  • Reduction or emphasis of bandwidth of signals
  • 5K067
  • MOBILE RADIO COMMUNICATION SYSTEMS
  • 5K068
  • Stereo-broadcasting methods
  • 5K069
  • Use of switch circuits for exchanges and methods of control of multiplex exchanges
  • 5K072
  • RADIO RELAY SYSTEMS
  • 5K073
  • STRUCTURE OF TELEPHONE EXCHANGES
  • 5K084
  • 5K089
  • 5K101
  • Telephonic communication linked with other devices
  • 5K102
  • Optical communication system
  • 5K127
  • TELEPHONE FUNCTION
  • 5K159
  • RADIO TRANSMISSION SYSTEM IN GENERAL (DIVERSITY SYSTEM, ETC.)
  • 5K201
  • TELEPHONIC COMMUNICATION SERVICES
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