[SI-LIST] E1 EMI protection

Does anyone know why E1 transformers do not typically have built in common mode 
chokes like Ethernet? Cabling is the same as ethernet so I would think that 
radiated emissions would be similar.
   
   
  I know some manufacturers have it built into the transformer and you can get 
it integrated with the connector but sometimes this is not an option because of 
single source issues etc. 
   
  I can add a common mode transformer but I can't help but wonder if additional 
EMI protection like this is typically not used in an E1 application and if so 
why?

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