When the voice light 1 is on, it means that the user has opened a fixed line (no cost will be incurred and broadband will not be affected). If you need a fixed line, you can only install the phone for use, but you can't turn it off. Please log in to the online business hall for details.

Serial optical fiber Cat (modem) is a photoelectric converter that can convert 232/485/422 serial signals into optical fibers for transmission, commonly known as serial optical fiber transceiver. It can realize bidirectional transparent data transmission between optical fiber and RS-232/485/422 serial port.