A protocol that allows an IEEE 802.11a wireless LAN (WLAN) to actively shift frequency channels.As 802.11a competes for spectrum with HiperLAN, the standard developed and promoted by the European Telecommunications Standards Institute (ETSI), 802.11a implementations in Europe must use DFS and transmission power control (TPC), which reduces the power level to no more than needed. In combination, these protocols serve to eliminate interference issues with incumbent signals. See also 802.11a, ETSI, frequency, IEEE, HiperLAN/1, HiperLAN2, interference, protocol, and WLAN.
(Distributed File System) An enhancement to Windows server operating systems that allows files scattered across multiple servers to be treated as a single group. With Dfs, a network administrator can build a hierarchical file system that spans the organization's LANs and WANs. Dfs was introduced with Windows NT, and the root of a Dfs file hierarchy resides on a Windows server or on a Samba server. See Samba. Dfs vs. DFS Microsoft deliberately used lower case letters in Dfs because DFS (all caps) stood for the Distributed File System that was part of the Distributed Computing Environment (see DCE).