This 1G SFP DAC cable is a passive direct attach copper twinax cable with a 0. Each 1G DAC cable has been engineered and designed to work flawlessly in the 1G SFP port of Cisco ethernet switches, servers, and ethernet Network Adapters. 5m~7m length and Active for 1m~15m length. All cables are 100% factory-tested for optimal. The 1G SFP Passive Direct Attach Copper Twinax Cable is designed for use in 1GBASE Ethernet. The modules are compatible with most 1000BASE-X SFP ports and 10GBASE-R SFP+. Direct Attach Copper (DAC) cables are factory-terminated twinax assemblies that integrate transceiver-style connectors such as SFP/SFP+, SFP28, QSFP+, QSFP28, QSFP-DD and OSFP at both ends, creating a cost-effective, zero-power electrical link for short-reach, high-speed networks.