1. SG15 update – February 2019 Media architecture Stephen Shew
SG15 liaison rapporteur to ONF on SDN Architecture

2. Q12/15 & Q14/15 interim meeting 21-25 January 2019
Two liaisons were written to ONF
SG15-LS176: Coordination of Ethernet information and data modelling work
In SG15-LS176.zip
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

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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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)

11. 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

12. Management capabilities (G.807 clause 15)
Clause 15 on management capabilities has been restructured to clarify that:
The OMS OSME and OTS OSME can exist without an OSC, without non-associated overhead
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

13. 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