A table representing groups of protected or protecting elements. Only one row for NT protection group which will always be created and cannot be deleted. From ISAM R4.1.02 the default created NT protection group will be locked. (before it was unlocked). From R3.3 onwards, each LT protection group (comprised of 2 adjacent slots LT n and LT n+1, where n is a odd number), also has a row. The protection groups are created by default even though the protection groups are not used. ALCATEL NOTE: SUPPORT: YES TABLESIZE: DEP as described above