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  • 2022-05-10 TAPI Meeting Notes
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Date

Attendees

Goals

  • Admin
  • Optical Impairments review
  • Layer Protocol Name and Qualifier of CSEP
  • DSR UNI Model

Agreed Items & Priority

Discussion items

10 minsAdministrative

All



TAPI RIA 2.0:

  • Scheduled two additional, official, dedicated TAPI calls:
    • Wed 13:00-15:00 and Thu10:00-12:00 CEsT

Asked to ONF to extend the additional, official, dedicated TAPI calls till July 2022.

This week the next calls are on Wed 12-15; Thu 10-12; Fri 11-13 CEsT

Next week: Mon 16, 14-16; Wed 18, 12-15 CEsT

  • Andrea Mazzini will send the invitation to anyone who wants to participate.


TAPI weeky call canceled

TAPI weeky call

Preliminary agenda:

  • Continue the Optical Impairments review
  • Check the details of DSR UNI model
80 mins

Optical Impairments review

All

Andrea Mazzini shows the updated diagrams with ROADM Path impairments.


  • Andrea Mazzini are ROADM Path Impairments to be considered unidirectional?

  • Esther explains that the ROADM Path Impairments augment the connectivity-matrix defined in RFC 8795, hence the impairment directionality is inherited:

  • 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.
30 mins

DSR UNI Model

All

Andrea Mazzini presents some slides on the DSR UNI model. The idea is to keep a single NEP-SIP couple for a port which can support either DSR or ODUk rates.

  • Agreed that instead of DSR it is better PHOTONIC_MEDIA (and in future maybe also ELECTRIC_MEDIA).
  • Discussion on the "simplified" model, agreed a further simplification, from the expanded model:


  • To the compact model, with only one CEP instance, including 10GE and ODU2 functions: