The present document specifies requirements of transport functionality of equipment, which processes SDH
concatenated path layers. The functionality is described by a set of functional building blocks and a set of rules by
which they are combined. The generic description method and generic functionality is described in EN 300 417-1-1 [1]
and ITU-T Recommendation G.806 [2].
For equipment which is compliant with the present document the processing of SDH concatenated path layers with in
the equipment shall be describable as an interconnection of a subset of the functional blocks contained within the
present document.