edge connector question

[mlee]

I notice in the sample file for PCI that each pin for the edge connector has a 2-D line going down (and off the board) to a larger line (bus?.. they are all connected now). What is the purpose of this? Do I need to add this to my PCI edge connector part? (I did not use the sample file because it is in metric and I am still using mils.)

Thanks.

[randychase]

Good question, simple answer.

We use 2D lines because they do not show up as DRC shorts, as compared to copper.

In order to plate the fingers using nickel/gold or whatever, they fabricator needs to make an electrical connection. On the fabricator's board, the area past the fingers is not routed/cut off yet. The 2D lines will be printed on the substrate and will electrically connect all the fingers. Typically the 2D lines connect to a larger horizontal bar or the shorting bar. This allows the fabricator a place to clip to to provide an electrical connection.

After plating and other processes, the board is routed/scored or cut and the 2D lines are cut away.

What can be real interesting is selective gold plating in the middle of the board, or in the middle of a panel.