All HUMS data drivers support remote connection, meaning that data source and target application need not be running on the same computer. For HUMS solutions relying on a third party SQL database, remote access is managed by the database engine and connectivity drivers. For proprietary directory / .le structured data storage, remote access is provided through standard .le sharing protocols. This way, remote access is provided without having to install any additional software on the data storage servers. This is an important point, as ground station software today exists for a variety of hardware and operating system platforms which in some cases are in the process of becoming obsolete, thus rendering development of any additional platform speci.c software unpractical.
For communication across Internet, data are channeled through Virtual Private Networks (VPN). VPN is an open technology which ties together two Internet connected Local Area Networks (LAN) so that they appear as one. A VPN tunnel ensures protection of both end networks, provides authentication of both parties, and allows encryption of all data transferred through the tunnel. Again, this is achieved using only standard protocols which are supported by all platforms.

4.4 Common Storage
The continuous research into fault detection algorithms requires large amounts of vibration data in order to understand how mechanical faults a.ect the vibration signatures of the transmission system. Test-rig experiments are expensive, and are not necessarily representative for the vibration signatures recorded in .ight. It is thus essential for a HUMS OEM to gather as much authentic HUMS data as possible. Such data can be extracted from the op-erator ground stations using the solution presented in the previous section.
An additional technical challenge is .nding e.cient means of storing large quantities of data from several systems. By default, a HUMS OEM must keep one data reservoir available for each system and version in order to provide its researchers with access to the relevant data. Further, some ground station data reservoirs have limited capacity due to their design, meaning that a large number of data storage servers are necessary to host the data from an entire .eet of aircraft.
This problem has been overcome by the development of a common data storage. The common data storage is based on the generalized HUMS data format introduced in the previous sections, and is thus capable of storing data from any system for which a data reservoir driver exist. Further, this data storage solution is scaled to store all data ever recorded by an entire
4.5. DISCREPANCY REPORTING
.eet. Consequently, it provides researchers with a single interface into all data recorded by all supported systems, greatly simplifying data management tasks for the HUMS OEM.
　
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