What does Dual Chaining actually mean?

Hardware MikroTik hardware general
5

janisk, I know this has nothing to do with this problem, but I can’t reach anyone from mikrotik since I can’t send messages..
Could you please take a look and answer to this question? http://forum.mikrotik.com/t/gpon-networks-with-mikrotik-routerboard-sfp-ports/79950/12