1. 
   DBm0
   dBm0 is an abbreviation for the power in dBm measured at a zero transmission level point. dBm0 is a concept used (amongst other areas) in audio/telephony processing since it allows a smooth integration of analog and digital chains. Notably, for A-law and μ-law codecs the standards define a sequenc...
   Found op http://en.wikipedia.org/wiki/DBm0
   
   
2. 
   dBm0
   Power that would be at zero TLP reference level.
   Found op http://www.encyclo.co.uk/local/20957
   
   

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