Pretty sure these devices don't support SNMP, so you can only really ping them for their availability.
It may be possible to create a screen scrape to collect data from the device's web interface, but it won't be part of Network Performance Manager *.
* Unless you're really clever!
1.Connect the PC to the LAN port on Huawei HG8245Q2. 2.The default IP address of the HG8245Q2 is assumed to be 192.168.100.1. Set the IP address of the PC to 192.168.100, which locates in the same network segment as the ONT. 3.Enter http://192.168.100.1 in the address bar of the browser and press Enter. Then, the login window is displayed.