HSGQ-XPON-STICK is a miniature XPON SFP ONU device that can be plugged into the SFP optical port of a switch or routing device to provide XPON network access to the device. In principle, the HSGQ-XPON-STICK is an optical module, but it has a built-in CPU, flash memory, and a system, so it can be used as an optical cat.