featuresSupport IEEE 1588 V2Optical connectorSFP/SFP +, LC type interfaceNetwork topologyPoint to point, chain type, star type, ring type,ring-with-chain type, ring-cross type, ring-tangency typeBackup and protectionNetwork level protectionClient-side 1+1protection, 1+1 protection inside board, optical multiplex section 1+1 protection, optical line 1+1 protectionEquipment level protection● Power supply backup● Fan backupInstallation"19"and 23" cabinets, ETSI 300mm/600mm cabinetsWorking tem