... types of board: 1 SCU, 4 LPU,1 Fan and 2 Powe board OLT 2000Feature listOLT SwitchSpecificationDescriptionBridgeL2 bridge: transparent ... links or PON portsQoSSwitch part: IEEE802.1P, SP, WRR and SP+WRRPON part: Four priority levels: TDM1, Sensitive, Guarantee ... and SNMP trapEquipment ManagementLED, reset, firmware upgrade and so on For the detail information,please contact us OLT 2000 GEPON equipment