SG15 update – February 2019 Media architecture Stephen Shew SG15 liaison rapporteur to ONF on SDN Architecture 2019-02-07

SG15 Plenary#3 – 08-19 October 2018 Q12/15 & Q14/15 held an interim meeting 21-25 January 2019 Two liaisons were written to ONF SG15-LS176: Coordination of Ethernet information and data modelling work In ONF_LS_005_OIMT-OTCC_to_SG15_MEF_on_TR-512-v1.4.pdf SG15-LS177: on Media work in ITU-T SG15 In SG15-LS177.zip This presentation focuses on the 2nd liaison out of Q12/15 & Q14/15 Draft Recommendations sent to ONF OIMT and OTCC are: G.807 (ex G.media) Architecture of optical media G.872 Architecture of optical transport networks G.876 (ex G.media-mgmt.) Management Requirement and Information Model for Media

Architectural additions and conclusions Liaison points 1 2 3 4 Examples Nomenclature – analogue functions Information/Signal boundary Terminology 5 Recommendation relationships

Applying draft G.807 A number of systems described in Recommendations developed in SG15 were examined to see how they could be described by constructs in G.807. These included: ITU-T G.sup55 (07/2015) Radio-over-fibre (RoF) technologies and their applications ITU-T Rec. G.9803 (2018) Radio over fibre system B-PON (Broadband Passive Optical Network, in ITU-T G.983-series) G-PON (Gigabit-capable Passive Optical Network, in ITU-T G.984-series) NG-PON (Next Generation Passive Optical Network, in ITU-T G.987-series and G.989-series) ITU-T G.9991 (2018) High speed indoor visible light communication transceiver – System architecture, physical layer and data link layer specification Conclusions The constructs in draft G.807 were adequate for PON systems and visible light communications Additional constructs were needed for analogue to analogue signal functions in the radio over fibre use cases

Examples from G.Sup55 D-RoF G.Sup55 Figure 6-4a) - digitized RF-band signal A G.807 view is shown in the downlink direction. digital RoF Downlink RF signal Digital to digital converter Optical modulator Optical demodulator D/A converter digital information stream RF-band filter data in digital baseband digitized RF-band subcarrier digitized RF-band subcarrier signal Direction of transmission

Examples from G.Sup55 D-RoF G.Sup55 Figure 6-4b) - IF-band signal A G.807 view is shown in the downlink direction. IF to RF converter needs a frequency mixer frequency mixer digital RoF Downlink RF signal Digital to digital converter Optical modulator Optical demodulator D/A converter RF-band filter data in digital baseband digitized IF-band subcarrier digitized IF-band subcarrier ref frequency Direction of transmission

Examples from G.Sup55 D-RoF G.Sup55 Figure 6-4c) - digitized I/Q baseband signal A G.807 view is shown in the downlink direction. A modulator is needed that takes two signals as input, and outputs a signal digital RoF Downlink RF signal I/Q modulator Digital to digital converter Optical modulator Optical demodulator D/A converter Analogue signals (I&Q) fibre data in digital baseband digitized I/Q samples digitized I/Q samples copper wire ref frequency Direction of transmission

Examples from G.Sup55 Analogue RoF G.Sup55 Figure 6-1a) Analogue to analogue modulation takes RF-band subcarrier and output analogue RoF Downlink RF signal RF-band subcarrier Analogue RoF electrical modulator Optical modulator Optical demodulator data in digital baseband RF-band filter fibre copper wire Direction of transmission

Nomenclature – Analogue Functions The frequency mixer and analogue modulator are newly introduced functions in G.807 They are part of functions at the signal/signal boundary. frequency mixer Coupler or filter Frequency1 - frequency 2 Amplifier analogue modulator/converter Input signal 1 Output signal Frequency1 + frequency 2 frequency2 (optional) Input signal 2

Information/signal boundary Use the “home plate” symbol for functions at the information/signal boundary. Function Input Output Modulation Client digital information encoded into one or more digital streams A signal with the digital information modulated on it Demodulation A signal with digital information modulated on it The original client digital information streams Optical Power Monitor A signal (with or without digital information modulated on it). A digital information stream containing information about the power of the signal. OSNR monitor A digital information stream containing information about the OSNR of the signal Signal Quantization (A/D) A digital information stream containing a sampled and quantized representation of the input waveform. Signal recreation (D/A) A digital information stream containing a sampled and quantized representation of the waveform. A signal. The degree of similarity to the original signal form is a function of sampling and quantization parameters (e.g., sampling rate). I/Q sampling A modulated signal. Two digital information streams, one representing the in-phase (I) and the other the quadrature (Q) components of the signal. Signal recreation (I/Q) digital information stream Function label signal (analogue)

Terminology Media link changed to “media channel group” The MCG can be also be used to represent the set of network media channels that support on OTSiG “media channel assembly” was introduced and represents a media channel group and its non-associated overhead. Only the OMS MCA and OTS MCA are described in G.807 These changes affect the description of media topology

Management capabilities (G.807 clause 15) Clause 15 on management capabilities has been restructured to clarify that: The OTS OSME and OTS OSME can exist without an OSC This could impact the information model Non-associated overhead may be carried by an OSC or an OCN The entity being monitored by an OSME is the optical power in a (defined) frequency slot Two new (not yet supported) maintenance indications have been defined Frequency slot FDI – indicates that optical power observed by an OPM-pwr at the end of an OSME was less than the minimum level expected. Frequency slot BDI – used to inform the head end that a FDI was detected

Recommendation relationships G.872 modified to contain only the OTN digital layer architecture References are now made to G.807 for media aspects that support OTN frames in OTSi Management abstractions in G.807 are not OTN specific: OTSiG, OTSiG‑O, OTSiA optical signal maintenance entity (OSME) OMS, OMS-O, OMS OSME OTS, OTS-O, OTS OSME OTN (OTU) G.872 Ethernet (MAC/PCS) Visible Light Communication (G.9991) Digital Layers OTSi Optical signals Media constructs Media G.807 Fibre, free space