I have done this many times. We add zero ohm resistors to make diff pairs, route the board, then remove the resistors. Jerry ________________________________ From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Thurlow DeHorsey Sent: Wednesday, February 11, 2009 8:11 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] diff-triple Constraint manager handles diff-pair well, how about diff-triple ? Two signals sharing the return signal, requiring spacing and matched length. Has anyone set this up in constraint manager? Thurlow deHorsey Hybricon Corp Ayer,MA