Under Logic, select Assign Differential pairs then select Auto Generate. Just make sure all your diff pairs are named correctly....ie = Diff_clk_p and Diff_clk_n -----Original Message----- From: JACK KELLY [mailto:jack.kelly@xxxxxxxxxx] Sent: Friday, March 18, 2005 11:20 AM To: 'icu-pcb-forum@xxxxxxxxxxxxx' Subject: [PCB_FORUM] Re: Auto Generate Differential Pairs how do you auto-generate differential pairs in 15.2? -----Original Message----- From: Feehan, Stephen [mailto:Stephen.Feehan@xxxxxxxxxxx] Sent: Friday, March 18, 2005 10:21 AM To: 'icu-pcb-forum@xxxxxxxxxxxxx' Subject: [PCB_FORUM] Re: Auto Generate Differential Pairs The netlist generated from viewlogic = netlist_name.tel -----Original Message----- From: Andy_Kulik@xxxxxxx [mailto:Andy_Kulik@xxxxxxx] Sent: Friday, March 18, 2005 11:03 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: Auto Generate Differential Pairs we do. what's a tel file? Feehan, Stephen Sent by: 03/18/2005 11:05 AM Please respond to icu-pcb-forum@xxxxxxxxxxxxx To "'icu-pcb-forum@xxxxxxxxxxxxx'" <icu-pcb-forum@xxxxxxxxxxxxx> cc Subject [PCB_FORUM] Auto Generate Differential Pairs Anyone using the auto generate diff pairs in version 15.2 instead of driving them from the schematic (viewlogic/cms)? If yes, how are you handling all the add/delete diff pairs when importing new tel files? Regards, Stephen Feehan Siemens Communications, Inc.