This Recommendation | International Standard (1995) provides a model for characterizing the relationship between resources in terms of the way one or more resources may provide a back-up role for other resources. This includes the hot/cold standby concept and the associated aspects of primary and secondary back-up.

This Technical Corrigendum 2 revises the text to include ASN.1:1997 in 2.1, 2.2 and 13.1.