Mike, We have a TNV3 ISDN interface on most of our products. We hand place and route the isolated circuitry, then generate a "keep out" area, on all layers, with a generous spacing round all the tracks and pads. The autorouter then has the rest of the board to play with. Regards, Geoff Lister
[email protected] Senior Engineer Motion Media Technology Ltd., Horton Hall, Horton, Bristol, BS37 6QN, UK Direct: +44 (0) 1454 338561 ISDN: +44 (0) 1454 338554 Switchboard: +44 (0) 1454 313444 Fax: +44 (0) 1454 313678 On 17 November 1999 20:21, Rains,Mike [SMTP:[email protected]] wrote: > > Colleagues, > > I am curious to know how you handle PWB design for safety compliance: > > 1. How do you document the required spacings on the schematics? > 2. Do you use tools provided by your schematic entry system (ViewLogic, > Valid or whatever) to enter these requirements? > 3. Does your PWB layout system import these requirements from your > schematic entry system and automatically ensure they are maintained as the > board is designed? > 4. How do you view the different circuit "segments" once the board is > designed? That is, how do you visually verify that spacings are maintained > between all "segments" on a single layer and through multiple layers? > > The reason that I'm asking is that this is an area of interest here. Our > boards are typically six layer, very densely populated and can have ac > mains, SELV and intrinsically safe circuit segments. We are developing ways > to try and reduce human error and effort in designing these boards. I would > be interested to know if anyone else has an interest in this subject. > Thanks. > > Best regards, > Mike Rains > Foxboro Co. > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
