This table supports retrieval of unit inventory information available via the EOC from units in a HDSL2/SHDSL line. Entries in this table are dynamically created during the line discovery process. The life cycle for these entries is as follows: - xtu discovers a device, either a far-end xtu or an xru - an inventory table entry is created for the device - the line goes down for whatever reason - inventory table entries for unreachable devices are destroyed. As these entries are created/destroyed dynamically, they are NOT persistent.