NEN EN 50494 : 2007

Introduction
1 Scope
2 Normative references
3 Acronyms and definitions
   3.1 Acronyms
   3.2 Definitions
4 System architecture
5 SCIF control signals
   5.1 DC levels
   5.2 Method of the data bit signalling
   5.3 Structure of the DiSEqC message in the single
       coaxial cable system
6 Structure and format of the DiSEqC messages
   6.1 DiSEqC addresses
   6.2 Normal operation
       6.2.1 ODU_Channel_change
       6.2.2 ODU_PowerOFF
   6.3 Special modes
       6.3.1 Installation, SCIF parameters recognition
       6.3.2 ODU_UBxSignal_ON
       6.3.3 ODU_Config
       6.3.4 ODU_LoFreq
7 Look-up tables and conventions
   7.1 UB slots numbering
   7.2 Input banks numbering
   7.3 Config_Nb table
   7.4 LoFreq table
8 Traffic collision management rules
9 Optional extension of the single cable distribution to
   the multi-dwelling installations
   9.1 Extension for multi-dwelling installations
   9.2 Extensions for structure and format of the DiSEqC
       messages
   9.3 Specific commands for installation
   9.4 Installation with manual entry of the system parameters,
       PIN code handling
   9.5 SDU and MDU compatibility rules
Annex A (informative) - Implementation guidelines
   A.1 Installation impedance
   A.2 Installation: signal reflection and returned loss
   A.3 Power supply of the SCIF
   A.4 Tuning word calculation, software recommendations
   A.5 RF scanning, RF tone recognition, SCIF parameter
       recognition

Explains: - the system physical structure; - the system control signals, which implement an extension of the DiSEqC set of commands described in the DiSEqC bus functional specification; - the definition of identified configurations; - management of the potential collisions in the control signals traffic.