Hi Experts! I use double-stripline layers for MGb (PCI-Ex, sRIO) pair routing. I ordered the PCB Designer not to route such pairs on adjacent layers, close to each other, not even PERPENDICULAR to each other. Now it seems I can't avoid it any more. My PCB Designer seems to run out of real-estate. I have 4-mil separation between the 2 layers and 4-mil from each one to a GND layer on each side. The pairs are running at 2.5 to 3.125 Gb/s What risks, if any, I run into, if I do permit routing the pairs perpendicular to each other? Are there any precautions I should take while doing it? Thanks Itzhak Hirshtal Elta The information contained in this communication is proprietary to Israel Aerospace Industries Ltd., ELTA Systems Ltd. and/or third parties, may contain classified or privileged information, and is intended only for the use of the intended addressee thereof. If you are not the intended addressee, please be aware that any use, disclosure, distribution and/or copying of this communication is strictly prohibited. If you receive this communication in error, please notify the sender immediately and delete it from your computer. Thank you. This message is processed by the PrivaWall Email Security Server. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu