A table representing the protected or protecting elements. An element can be either a board or an extension chain. Both are identified by the corresponding slot identifier (extension chain is identified by slot of corresponding NT board). This table has only two rows from ISAM R2.2 to R3.2. From R3.3 onwards, this table has a row for each slots in the main shelf. ALCATEL NOTE: SUPPORT: YES TABLESIZE: DEP as described above