CISCO - 20-PORT WIRE-SPEED 10/100/10001630 (RJ-45) HALF-CARD - EXPANSION MODULE - 20 PORTS (WS-X4920-GB-RJ45). KEY FEATURES : DEVICE TYPE : EXPANSION MODULE - 20 PORTS FORM FACTOR : PLUG-IN MODULE NETWORKING : CONNECTIVITY TECHNOLOGY : WIRED CABLING TYPE : ETHERNET 10BASE-T, ETHERNET 100BASE-TX, ETHERNET 1000BASE-T DATA LINK PROTOCOL : ETHERNET, FAST ETHERNET, GIGABIT ETHERNET DATA TRANSFER RATE : 1 GBPS STATUS INDICATORS : PORT STATUS, STATUS FEATURES : FULL DUPLEX CAPABILITY, HALF DUPLEX MODE CONDITION : REFURBISHED. AVAILABILITY : IN STOCK. OUR WARRANTY : 30 DAYS.