> On 14/11/2017, at 9:56 PM, Karl Gerhard <karl_gerh at gmx.at> wrote: > > As far as I understand the cross-coupling of clock input is only related to SONET/SDH stuff, is that correct? Probably 1588 and stuff as well. Useful if you’re a mobile operator or someone else that cares about accurate clocking for whatever reason. -- Nathan Ward