I Agree on the alarm contacts point.
As for Active vs Passive, this device is only really suitable for Active fibre deployments. As it is SFP based, this means 1gigabit modules. You could potentially use BIDI modules in it to get gigabit down a single fibre, or could use WDM modules at the headend with a multiplexer, then passive splits off to clients (but the cost would be high, you might as well just go Active BIDI for the ease of it)
For "head-end" equipment it depends on your deployment, e.g. straight L2/PPPoE, L3 or MPLS.
Since this product is still being developed, most of the above is based on the information available, and may change/be wrong