57Appendix A Technical specificationsDimensions and weightTable 15 Dimensions and weightItem SpecificationHeight (H) 44 mm (1.73 in), which is approximately one rackunit (RU)Width (W) 442 mm (17.40 in)Depth (D) 460 mm (18.11 in)Weight 7.5 kg (16.53 lb)StoragesTable 16 Processor and storagesItem SpecificationFlash 4 MBMemory type and capacityDDR2 SDRAM2 GB (default)4 GB (maximum)Memory modules with the same capacity must be used in pairs.Compact flash (CF) card 256 MB by default for the built-in CF card; 256 MB, 512 MB, or 1 GB for anoptional external CF card (CF cards less than 256 MB are not supported)AC power supplyTable 17 AC power specificationsItem SpecificationRated voltage range 100 VAC to 240 VAC; 50 Hz or 60 HzMaximum input current 2.5 AMaximum power 150 WRPS power supply (optional)The redundancy power supply (RPS) can provide power supply to ensure continuous system operation fora short period when the system power supply fails.