Backplane design

摘要

I Have been doing high-speed-board designs for several years and now am working on a backplane design for the telecomm business. The power source to our equipment provides -48V and -48V RETURN, which must be bused to all the line cards that plug into the backplane. On each of the line cards, I have an isolating dc/dc converter to step down from -48V to 5 and 3V. Many 1.25-Gbps differential signal pairs go across the backplane between the line cards.