xcmGenOptionFamilyIndex 1.3.6.1.4.1.253.8.51.10.2.1.12

The value of 'xcmGenOptionIndex' corresponding to a next 'family' conceptual row in the 'xcmGenOptionTable', or zero if this conceptual row has no associated 'family' members. Usage: Generally, reconfiguration options (of similar or unlike type) are 'chained' vertically via '...[Next|Previous]Index'. But, in the case where particular reconfiguration options MUST be 'tightly coupled', they SHOULD be 'shelved' horizontally via '...FamilyIndex' (eg, an IP address and an IP subnet mask).