This read-create INTEGER, ranging 0 to 255, is a bitmask that selects which specific bits at the configured offset should be extracted for comparison. An admin uses this to match only a subset of bits within a byte, such as a 2-bit flag field packed alongside other unrelated bits, avoiding false matches from unrelated bits at the same byte position. For example, to match only the top two bits of a flags byte while ignoring the other six bits, the admin sets this mask to isolate just those two bits before the comparison against rlQosOffsetPattern.