EN 60027-2:2007

1 Scope
2 Normative references
3 General concepts
  3.1 General
  3.2 Linear networks
       3.2.1 General
       3.2.2 Two-port linear networks under sinusoidal conditions
       3.2.3 n-port linear networks under sinusoidal conditions
  3.3 Line transmission of signals and telephony
       3.3.1 General
       3.3.2 Line transmission
       3.3.3 Subscripts for line transmission
       3.3.4 Telephony
       3.3.5 Subscripts for telephony
  3.4 Waveguide propagation
       3.4.1 Frequency and wavelength in a waveguide
       3.4.2 Characteristic and normalized impedance and admittance
             in general (unbounded space, waveguide or transmission
             line)
       3.4.3 Impedance and admittance at a point in a substance
       3.4.4 Impedance and admittance at a point in vacuum
       3.4.5 Impedance and admittance of a waveguide
  3.5 Radiocommunications
       3.5.1 General
       3.5.2 General and tropospheric propagation
       3.5.3 Ionospheric propagation
       3.5.4 Antennas
       3.5.5 Radio links
  3.6 Optical fibre communication
  3.7 Television
  3.8 Data processing and data transmission
       3.8.1 Teletraffic
       3.8.2 Data processing and digital transmission
       3.8.3 Prefixes for binary multiples
  3.9 Information theory
  3.10 Dependability
  3.11 Equivalent circuits of piezoelectric crystal units
  3.12 Semiconductor devices
  3.13 Electroacoustics
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications

Defines rules for the use and writing of letter symbols for telecommunications and electronics.