SyRotech OLT SY-GOPON-20LT network switch has high stability with low cost and flexible networking construction, two fixed pon slot with 1:64 splitting ratio, 20km maximum transmission distance, in band and out band management, EMS management based on standard SNMP protocol, powerful QOS function, variou OAM function, port flow control and flow shaping, GOPON and 2OLT could support 128 ONU maximally, comprehensive network management, telnet and local command line management, realize stable and efficient dynamic bandwidth allocation, ONU auto and detection and registration.