ctronMultiFnbRingIndex 1.3.6.1.4.1.52.4.1.2.6.1.2.1.1.2

An unique value representing an instance of an FNB ring path attachment. Its value ranges between 1 and n, where n equals the maximum number of FNB ring paths available in a given chassis. For an MMAC chassis with an FNB, this number is 4.