On Mon, Jul 14, 2014 at 11:07 PM, Robert Rolf wro= te: > You can probably get away using relays that have a very flat & short > geometry.NAIS make many that are suitable. > DPDT, tiny geometry. Split the cable out in pairs, and put a pair on > each relay. You'll need 4 since GBE uses > all 4 pairs. If your cable run isn't near the length limit, the losses > introduced will have negligible effect. > You'll lose about 1" of 'twist, but you lose nearly that much with > each plug on a Cat6 cable. I will have a look for those relays, they sound pretty good. > There are micro relays (MEMS) used in cell phones, if you want to keep > the impedance perfect > and are good at doing strip line board layouts. Not so much! Well, not much experience at least. My run right now is a 5' cable between two other switches, so that's well within the range that might tolerate a slight bit of loss. > Manual switches also exist to do this. You didn't say if you needed > electrical control. > http://secureswitch.com/ManualABswitches.htm > > and electrical one > http://www.blackbox.com/Store/Detail.aspx/Pro-Switching-System-1U-NBS-RJ-= 45-A-B-All-8-Pins-8-Port/NBSALL8 > > You need to search for "gigabit failover switch". > > Lots of info on 'copper A/B switching' here. > http://img.pr.com/release-file/1108/343451/AB_Switches_5028-02.pdf Ah, thank you! I didn't think about using the "failover" term. As you can imagine, trying to search for a switch like this is a bit tricky. I had found manual switches, but none before yours mentioned a speed rating, so that's a nice thing. Thank you! Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .