1 GE (Gigabit Ethernet), 3 FE (Fast Ethernet), 1 Voice (POTS), and 1 USB.
: Older firmware versions may experience "freezing" where lights stop blinking and signals are lost until a manual restart is performed. Firmware Gm220-s
Even if you follow the steps, things go wrong. Here is how to fix common GM220-S firmware failures. 1 GE (Gigabit Ethernet), 3 FE (Fast Ethernet),
Occasionally, a new firmware breaks features. For example, some GM220-S updates remove the ability to change DNS servers or disable TR-069 (remote ISP management). If you want to downgrade: 1 GE (Gigabit Ethernet)