In firmware version and above (Huawei variant), a "top" feature is the CLI (Command Line Interface) via Telnet/SSH .
Premium firmware packages include auto-sensing scripts for the optical line terminal (OLT). If a network shifts from EPON to GPON, or if the user resets the device to factory defaults, top firmware self-detects the active fiber standard without requiring manual intervention or reboots. 4. Broad OMCI Support firmware gm220s top