Zte H3600 [upd] [TRUSTED]

It’s a piece of telecommunications equipment used by internet service providers (ISPs) to deliver fiber-optic broadband to residential customers.

The is a Home Gateway / Optical Network Terminal (ONT) — specifically, a GPON ONT (Gigabit Passive Optical Network Optical Network Terminal).

So in short: it’s a (CPE — Customer Premises Equipment).