BS EN 50083-7:1996+A1:2000 Cable networks for television signals, sound signals and interactive services. System performance
Standards of EN 50083 series deal with cable networks for television signals, sound signals and interactive services including equipment, systems and installations:
• For headend reception, processing and distribution of television and sound signals and their associated data signals
• For processing, interfacing and transmitting all kinds of signals for interactive services using all applicable transmission media.
All kinds of networks like:
• CATV-networks
• MATV-networks and SMATV-networks
• Individual receiving networks.
and all kinds of equipment, systems and installations installed in such networks, are within this scope.
The extent of this standardization work is from the antennas, special signal source inputs to the headend or other interface points to the network up to the system outlet or the terminal input, where no system outlet exists.
The standardization of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals etc.) as well as of any coaxial and optical cables and accessories therefore is excluded.
BS EN 50083-7 applies to any cable network having a coaxial cable output and primarily intended for television and sound signals operating between about 30 MHz and 2 150 MHz. BS EN 50083-7 lays down the basic methods of measurement of the operational characteristics of cable networks having coaxial cable outputs in order to assess the performance of those networks and their performance limits.
All requirements refer to the performance limits which shall be obtained between the input(s) to the headend or headends and any system outlet when terminated in a resistance equal to the nominal load impedance of the system, unless otherwise specified. Where system outlets are not used, the above applies at the subscriber’s end of the subscriber’s feeder.
Contents of BS EN 50083-7:
- Foreword
- Scope
- General
- Specific scope of this Part 7
- Normative references
- Terms, definitions, symbols and abbreviations
- Terms and definitions
- Symbols
- Abbreviations
- Methods of measurement
- Mutual isolation between system outlets
- Amplitude response within a channel
- Chrominance-luminance gain and delay inequalities
- Non linear distortion
- Carrier to noise ratio
- Echoes
- Television and frequency modulation radio signal level
- Data echo rating and data delay inequality
- Interference in FM sound radio channels
- Signal level for digitally modulated signals
- Signal to noise ratio (S/N) for digitally modulated signals
- Performance requirements
- Impedance
- Carrier levels at system outlets
- Mutual isolation between system outlets
- Frequency response within a television channel at any system outlet for PAL and SECAM
- signals
- Long term frequency stability of distributed carrier signals at any system outlet 32
- Random noise
- Interference to television channels
- Video baseband requirements
- Hum modulation of carriers in television channels
- FM sound radio: Additional performance requirements
- NICAM performance
- Calibration of modulation depth
- Equipment required — additional items
- Preliminary checks on the measuring equipment for carrier to noise ratio
- Correction factors
- Calibration of the measuring receiver
- Bibliography
- A-deviations
- Correction factors for noise
- Digital signal level and bandwidth
- Power density method
