I just acquired the mysterious interface cable that goes between the RTFG-m-XO and RTFG-m-RB units. I have suspected that it wasn't a simple crossover cable, because the results I've seen with my homemade crossover haven't made a lot of sense.
Here's the scoop: the interface cable is a simple DB-9 to DB-9 ribbon cable with the ribbon flipped -- the striped side goes to pin 1 on the RB end, and to pin 5 on the XO end. We pretty much knew that. However, the conductor on the other edge of the ribbon (between pin 5 on the RB end, and pin 1 on the XO end) is BROKEN in the middle. So, there is NO CONNECTION between XO pin 1 and RB pin 5. (It goes without saying, but I'll say it anyway, that this means the cable ends are not interchangeable -- there is an XO end and an RB end.) Hope this is helpful. I got a few more interesting bits and pieces along with this cable, but I think this is the important news for those of us trying to interface these units at home. John _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
