Ariane Controls is a powerline communication technology provider - est un fournisseur de la technologie de communication par courant porteur.

The Powerline Communication Technology - La technologie de communication par courant porteur

est notre spécialitée.

We offer various products and services such as automatic meter reading - Nous offrons une grande variété de produits et services tel que la lecture automatique de compteur

We also offer various

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outils de développement

and

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services d'ingénierie
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Home / Technology / Comparison / CEBus /

PLM-1/CEBus
 
Narrow Band

 
Carrier

 
Bit Rate

 
Error Correction

 
Protocol

 

PLM-1 CEBus
 


NARROW BAND
The PLM-1 is a narrowband FSK-modulated system. Millions of current products use FSK. PLM-1 uses a high-efficiency filter. This filter offers high noise rejection, typically better than 20 dB at a few kilohertz outside its operating frequency. If a high-power tone were to enter directly into the operating frequency of any given system, it would impede its functioning. Wideband systems such as CEBus are vulnerable to most noise sources existing on the PLC medium while a narrowband system such as the PLM-1 filters out most of that noise.

  


SWEPT CARRIER
CEBus is a swept-carrier system, vulnerable to any noise in the 100 to 400 kHz range. CEBus is not a true Spread Spectrum system, because it does not process incoming signal according to Spread Spectrum theory and consequently does not show the processing gain normally associated with real Spread Spectrum systems. For example, a true Spread Spectrum system (100-400 kHz carrier, 10 kHz modulation rate) would offer about -15 dB Signal to Noise ratio, i.e., noise 5 times the signal. CEBus is specified at 3 dB, i.e., noise only 0.7 times that of the signal. For noise under 100 kHz or over 400 kHz, a CEBus system typically uses a simple second-order band-pass filter, that leads to poor protection against noise outside its main band.