The GLCTEST is a Cisco GLC-TE compatible copper transceiver module that has been designed, programmed & tested to work with Cisco brand switches & routers for extended temperatures. It delivers dependable 1 Gb E connectivity over copper cable, for 1000BASE-T compliant networks, with a maximum distance of up to 100 m (328 ft). This SFP copper module is hot-swappable, making upgrades & replacements seamless by minimizing network disruptions. Star Tech.com offers a wide variety of SFP modules & direct-attach SFP cables, providing the convenience & reliability you need to ensure dependable network performance.