Bhatji can you explain in details..
Exactly i cant say that all Decoders of certain provider is compatible with most encryptions . I presume that the decoder of a Channel provider is only compatible with their Encryption only . ie: If BIG CBS is having Irdeto encryption then their all Decoders r compatible with Irdeto only. if They change the Encryption to Conax then the decoder should be changed to Conax Enabled Decoder. This makes the Cable operator to change the decoder supplied by Provider.
Or
May be the decoder is compatible with Most Encryptions ie : Universal , Now the Providr changes the encryption to another then Provider may supply another VC to the Cable ops , so then they have to ask /call the Provider for new VC.
This i was meant to tell .