Hi all, 

I've been asked to do surge immunity testing on a 48Vdc input power supply
following British Telcom spec BTNR 2511. 

I'm not familiar with this standard, and I can't find it for purchase at the
common web sites (including British Telcom itself). 
- Is this standard still being used, or has it been replaced by another
document? 
- If it hasn't been replaced, where can I get a copy? 
- What are the characteristics of the surge? 

Thanks,
Pat Lawler
Condor DC Power Supplies --------------
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