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ONF Liaison Statement


26 July 2018


ONF OIMT & OTCC work on the modelling of photonic media


ITU-T Study Group 15

Hing-Kam Lam: Rapporteur Q14/15 ( )

Scott Mansfield: Associate Rapporteur Q14/15 ( )

Stephen Shew: Rapporteur Q12/15 ( )




Timon Sloane (ONF Vice President of Marketing and Ecosystem)



Reply to



Nigel Davis (OIMT Co-Chair)

Kam Lam (OIMT Co-Chair)

Lyndon Ong (OTCC Chair)


Dear colleagues,

Thank you for your liaison SG15-LS121: “LS on OCL, Information modelling of MCC and media”. The ONF OIMT & OTCC Projects have progressed on many aspects of the Core Information Model.

With regard to media, we are considering the use case of an express channel in a ROADM has led us to consider an additional type of media channel, other than a network media channel. In general, this is a media channel whose frequency slot overlaps with the frequency slots of one or more network media channels, but does not necessarily share their ports. A typical use for this would encompass the spectrum of an integral number of network media channels. The ROADM “express channel” is an example of this type of media channel which w W hen switched, this “wide” media channel reroutes all network media channels that share its frequency slot. A "wide" media channel may be used to provide model what is commonly called an "express" channel in a ROADM.   A OIMT construct has been discussed a construct to represent the concept of a wide media channel in the model for this , and we request that such a construct concept   it be considered in and

In G.872, the adaptation “OTSiG/<digital OTN client>” is found in various figures. This is understood to mean <this layer CI>/<Client CI> as specified in G.800 and the adaptation sour ce “accepts client layer network characteristic information at its input and processes it to allow transfer over a trail (in the server layer network)” (G.805). Hence the adaptation label “OTSi/<digital OTN client>” implies that an OTSi is the output of a trail termination function. Considering that the optical signal modulator/demodulator only modulates the information onto the signal, it does not add additional information and therefore does not perform trail termination, the nomenclature for the adaptation label does not fit this case. This is caused by a domain change in the media.  Identifying the electrical AI into the optical signal modulator/demodulator may be helpful since the modulator/demodulator function is not adding/removing (G.800) Layer Information.

It would be useful to have a generic label/name for the electrical AI entering the optical modulator/demodulator.

In considering the SOTU and MOTU interface classifications as shown in G.872 and other Recommendations, we have concluded that they do not have to be modeled modelled with other media artifacts artefacts . Please advise us if this is not the case.