PTP820G w/ RFU-C hardware protection...

Is it possible to connect two serepate 1+0 PTP 820G systems together to provided both IDU and RFU protection and have a single ethernet interface? Wondering if it can be done without having to use an external switch for link aggregation.  

it is not supported today. Current software support 1+1 HSB with a dual modem IDU.

In our roadmap next year, we will support 1+1 HSB with two 1+0 IDU to provide full redundancy for both IDU and ODU.