Connect with Synology RC18015xs+
1 Use at least one LAN cable to connect each RackStation unit to your switch,
router or hub.
Note:
Both RackStation units of the HA cluster must be connected to the network
in the identical way. For example, if you connect two LAN cables to the ports of
LAN 1 and LAN 3 on a RackStation, you have to connect two LAN cables to the
ports of LAN 1 and LAN 3 on the other RackStation to the network too.
2 Connect one end of a LAN cable to the Heartbeat LAN port of a RackStation,
and the other to the Heartbeat LAN port of the other RackStation.
3 Connect one end of the power cords to the power ports of each RackStation
and expansion unit respectively, and the other to the power outlets.
12 Chapter 2: Hardware Setup