Transcript Time- and Wavelength-Division Multiplexed Passive Optical Network

Analysing the optical network
unit power consumption in the
10 GB-capable passive optical
network systems
Speaker：Pu-Yu Yu​
Date: 2016/10/26
OUTLINE
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Introduction
XG-PON power management
XG-PON power management analysis
Model validation and discussion
Conclusion
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PREVIEW Passive Optical Network
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Passive means : no electricity to power or maintain
the transmission facility while doing signal
processing.
Only the terminal device need to use electricity,
the node between the places only need fiber
elements( splitter).
Downlink transmission uses broadcast based on
time division multiplexing. Splitter will distribute
input optical signal equally by their optical power
and transport to optical network users(1 to 16 ,1
to 32 ,1 to 64).
Uplink transmission uses TDMA.
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PREVIEW Passive Optical Network
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TDM-PON
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Point-to-multipoint approach
Uses a 1:N passive splitter/combiner to divide
the optical signal among all users in the
downstream direction and aggregate the users’
data
OLT uses DBA algorithm to arbitrate access to
the shared channel in the upstream direction,
avoid collisions, assign bandwidth to the users,
and provide QoS for different types of flows.
Ex: G-PON XG-PON
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WDM-PON
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The power splitter/combiner is replaced by a
wavelength selective filter.
Setting up a single wavelength with symmetric
bandwidth between each user and the central
office. (dedicated point-to-point connection)
Advantages over TDM-PON: scalable bandwidth,
Long reach (given the low insertion loss of filters,
optional amplification), security
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TWDM-PON
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Was selected as the primary solution for the NGPON stage 2.
Increases the aggregate PON rate by stacking
multiple XGPONs on different pairs of wavelengths.
(ONU equipped colorless transmitters)
Advantages: high fan-out, compatible with older
TDM-PON versions, coexistence within the same
ODN.
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Summary of features for PON
technologies
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INTRODUCTION
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Recently, the 10 GB-capable PON (XG-PON) was
introduced as one of the most promising NG-PON
systems.
One of the most advanced features enhanced in the
XG-PON system is the power saving support for
efficient energy management.
Reason :The increasing number of subscriber
terminals, optical devices, and transceivers; thus,
the related power consumption is expected to
increase to a great extent .
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INTRODUCTION
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The XG-PON transmission convergence layer
defines the specifications regarding power
consumption. According to the ITU-T G.987.3
recommendations, two power saving modes are
defined: the doze and the cyclic sleep modes .
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Doze modes : transmitter off but receiver on .
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Sleep modes : both transmitter and receiver
are off.
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INTRODUCTION
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This paper provide a rigorous analytical
framework for computing the average ONU power
consumption based on the telecommunication
standardisation sector (ITU-T) recommendations.
Aim to associate the power consumed by an ONU
with the ONU traffic arrivals, mathematically
modelling the power management state machine
by using a discrete time Markov chain (DTMC).
Further estimate the average time spent in the
doze mode and the cyclic sleep mode.
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XG-PON network model
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XG-PON power management
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The ONU management and control interface
(OMCI) constitutes the core signalling
mechanism between the ONUs and the OLT.
The XG-PON power management is
structured in power state machines.
Two mutually exclusive subsets: the full
power and the low-power subsets.
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XG-PON power management
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The full power subset consists of two distinct
management states: the ActiveHeld and the
ActiveFree states.
ActiveHeld: incorporates awake mode with full
power consumption.
ActiveFree: ONU monitors the upstream traffic
that arrives at the UNI and the downstream
traffic that is collected by the service node
interface (SNI) located at the OLT to be sent to
the ONU in order to decide whether a lowpower mode could be applied.
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XG-PON power management
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The low-power subset is realised by two
low-power saving modes referred to as doze
and cyclic sleep modes.
The XG-PON power management defines
two pairs of states for each low-power mode.
DozeAware states and the Listen states
SleepAware states and the Asleep states
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XG-PON power management analysis
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Let {PM(t), t ∈ T} ,where T = {0, 1, …}.
S = {S1, S2, S3, S4, S5, S6, S7, S8}. This vector
represents the ONU power management
states as follows: ActiveHeld (S1),
ActiveFree (S2), initial DozeAware (S3),
Listen (S4), DozeAware (S5), initial
SleepAware (S6), Asleep (S7), and
SleepAware (S8).
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XG-PON power management analysis
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To model the stochastic process PM(t) using a
DTMC, the memoryless property should be
ensured.
The ONU should not maintain information
concerning past transitions such as traffic
arrivals.
Downstream frame has a fixed size of 135,432
bytes.
Upstream frame has a fixed size of 38,880
bytes.
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Average power consumption
computation
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Model validation and discussion
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Model validation and discussion
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Conclusion
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In this paper, a precise model was presented
analysing the ONU power management in XGPON systems ,consists of a DTMC, which
encloses a set of countable states that describe
the power management states of an ONU.
The proposed analytical framework focused on
the ONU average power consumption
estimation, assuming that the ONU is able to
support both the doze and cyclic sleep modes.
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Conclusion
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Extensive validation and evaluation results
are presented, reflecting the model’s
accuracy.
Concurrently, the average power
consumption, the average time spent in the
Listen state, and the average time spent in
the Asleep state were associated to the
traffic an ONU experiences in both
directions.
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References
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http://www.cs.nccu.edu.tw/~lien/NIIslide/PO
N/hardcopy.htm
http://www.plankoe.com/products/Gpon.htm
R. Sanchez, J. A. Hernandez, J. M. Garcia and D.
Larrabeiti, "Provisioning 1 Gb/s symmetrical
services with next-generation passive optical
network technologies," IEEE Communications
Magazine, vol. 54, no. 2, pp. 72-77, February
2016.
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References
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Panagiotis Sarigiannidis, Malamati Louta,
Georgios Papadimitriou, Michael Theologou,
“Analysing the optical network unit power
consumption in the 10 GB-capable passive
optical network systems” , The Institution of
Engineering and Technology journal , Vol. 5,
Iss. 3, pp. 71–79 ,February 2016
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