Andrea Mazzini shows the updated diagrams with ROADM Path impairments.


- Esther adds the consideration that the internal ROADM structure could be very complex, while the connectivity-matrix provides the appropriate abstraction for the purpose of impairments evaluation.
- Also clarified that the ROAM Path Impairments do not include the Amplifier impairments, they are outside the box of the ROADM connectivity-matrix.
- Nigel Davis the semantic is analogous to the TAPI Node Rule Group, the switching layer being Media Channel:

- Andrea Mazzini hence the Node Rule Group shall be defined between MC NEPs, which is in line with the exclusion of amplification functions, modeled at OMS layer CEP.
- The Node Rule Group shall refer to the ROADM Path Impairments profile. It is a specific realization of the Transfer Cost.
- The same Node Rule Group instance may refer to more ROADM Path Impairments profiles in case of different impairments on different bandwidths.
- Agreed to add an optical impairments forwarding rule, to allow for a finer granularity of description, e.g.:
NodeRuleGroup 1
MC NEP of degree 1
MC NEP of degree 2
MC NEP of degree 3
MC NEP of degree 4
with rule MUST_FORWARD_ACROSS_GROUP
NodeRuleGroup 2
MC NEP of degree 1
MC NEP of degree 2
with rule OPTICAL_IMPAIRMENT
pointing to the ROADM profile1
NodeRuleGroup 3
MC NEP of degree 1
MC NEP of degree 3
with rule OPTICAL_IMPAIRMENT
pointing to the ROADM profile2
etc.
Andrea Mazzini shows the Fiber + Concentrated Loss diagram:

- Agreed that the right place where to add these impairments is the OTS_MEDIA CEP.
- Considering the OSC, another dedicated CEP could be made available on the same NEP, hence better the OTS_MEDIA CEP.
- Agreed that the Fiber Profile shall be referred by the AbstractStrand.