On 14 Nov 2017, at 11:56 EAT, Karl Gerhard wrote:

As far as I understand the cross-coupling of clock input is only related to SONET/SDH stuff, is that correct?

Not just SDH. SyncE allows you to do frequency synchronisation of clocks over Ethernet transport.

http://grouper.ieee.org/groups/1394/c/20031216/Sync_Ethernet_039a_draft.pdf

Also look at the 1588 PTP documentation.

Useful for e.g LTE backhaul, or any scenario where centralised clocking is important.

--
patrick
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