xcmCommsOptionFamilyIndex 1.3.6.1.4.1.253.8.64.4.2.1.12

The value of 'xcmCommsOptionIndex' corresponding to the next 'family' conceptual row in the 'xcmCommsOptionTable', or zero if this is the last associated conceptual row in a particular horizontal 'shelf' (of 'family' members) within a given set. Usage: Generally, communications options (of similar or unlike type) are 'chained' vertically via '...[Next|Previous]Index'. But, in the case where particular communications options MUST be 'tightly coupled', they SHOULD be 'shelved' horizontally via '...[Family|Previous]Index' (eg, an IP address and an IP subnet mask).