Cushion backed carpet tiles and carpet tile installations which can be installed without adhesives are described. A primary database is maintained on the server and includes at least one entry for each object disposed within the VWE. The sheath hub may have a valve and has two opposing winged tabs, each tab having a perpendicular portion and an angled portion as well as a female threaded portion. The non-secure and secure information is then passed from the hub domain controller only to the local domain controller associated with the given partition at the hub domain controller on request. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.