Exactly as described, this is the specific PCP value that this row's bandwidth ratio applies to within the parent allocation profile. This is what lets a single bandwidth-allocation profile hold a distinct ratio for each priority class present in a test, so a voice PCP and a best-effort PCP can each get their own defined share of the total test bandwidth within one profile rather than sharing one blanket ratio. For example, a profile might carry separate rows for PCP 5 and PCP 0, each with its own bandwidth ratio value, together defining how the test's total bandwidth splits across those two priority classes.