ethernet pon (epon) protocol - ieee 802 · ethernet pon (epon) protocol by edward beili 2 ieee...
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![Page 2: Ethernet PON (EPON) Protocol - IEEE 802 · Ethernet PON (EPON) Protocol By Edward Beili 2 IEEE 802.3 EFM working group 12 March 2001 EPON tutorial](https://reader035.vdocuments.net/reader035/viewer/2022062302/5adeed777f8b9ab4688b771a/html5/thumbnails/2.jpg)
12 March 2001IEEE 802.3 EFM working group2
EPON tutorial
Outline
l FTTx Services
l PON Networkl Point to Multipoint EPON Protocol
l EPONP building blocks
l Ranging
l Bandwidth Allocation
l PON Network Discovery
l Conclusion
![Page 3: Ethernet PON (EPON) Protocol - IEEE 802 · Ethernet PON (EPON) Protocol By Edward Beili 2 IEEE 802.3 EFM working group 12 March 2001 EPON tutorial](https://reader035.vdocuments.net/reader035/viewer/2022062302/5adeed777f8b9ab4688b771a/html5/thumbnails/3.jpg)
12 March 2001IEEE 802.3 EFM working group3
EPON tutorial
FTTx services
l Data– Speed: 100/1000Mbps; Symmetric/Asymmetric – QoS: Latency, Min/Max Rate– Security
l Video– Analog/Digital streaming
l Voice– Low jitter & latency– Constant delay– Business vs. Residential (Life-line)
![Page 4: Ethernet PON (EPON) Protocol - IEEE 802 · Ethernet PON (EPON) Protocol By Edward Beili 2 IEEE 802.3 EFM working group 12 March 2001 EPON tutorial](https://reader035.vdocuments.net/reader035/viewer/2022062302/5adeed777f8b9ab4688b771a/html5/thumbnails/4.jpg)
12 March 2001IEEE 802.3 EFM working group4
EPON tutorial
Passive Optical Network (PON)
OLT
ONU
ONU
ONT
ONU
PassiveOpticalSplitter/
Combiner
CO CPPON
![Page 5: Ethernet PON (EPON) Protocol - IEEE 802 · Ethernet PON (EPON) Protocol By Edward Beili 2 IEEE 802.3 EFM working group 12 March 2001 EPON tutorial](https://reader035.vdocuments.net/reader035/viewer/2022062302/5adeed777f8b9ab4688b771a/html5/thumbnails/5.jpg)
12 March 2001IEEE 802.3 EFM working group5
EPON tutorial
PON Challenge
l Only the OLT is able to detect collisionsl Upstream channel separation methods:
– TDMA– WDM– RF sub-carrier– Phase etc.
l TDMA issues:– Burst-mode Transceiver– Downstream traffic isolation (privacy)– Frame Segmentation to achieve small latency
![Page 6: Ethernet PON (EPON) Protocol - IEEE 802 · Ethernet PON (EPON) Protocol By Edward Beili 2 IEEE 802.3 EFM working group 12 March 2001 EPON tutorial](https://reader035.vdocuments.net/reader035/viewer/2022062302/5adeed777f8b9ab4688b771a/html5/thumbnails/6.jpg)
12 March 2001IEEE 802.3 EFM working group6
EPON tutorial
TDMA PON Protocols
l FSAN ATM-PON – ITU-T G.983+ Well defined, Field tried, Industry Standard
l Accepted by major ILECs: BT, FT, NTT, BellSouth, GTE, SBC, QUEST
l Supporting Vendors: Alcatel, Lucent, Terawave, QuantumBridge, Nortel…
+ Inherent 8Khz clock, QoS, Bandwidth allocation– Expensive & Complicated (Intermediate ATM layer)– Off-the-shelf components are scarce
l Ethernet PON+ Native IP+ Simple & Cheap off-the-shelf components– Non-standard technology– Complicated Telephony, QoS, Bandwidth allocation
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12 March 2001IEEE 802.3 EFM working group7
EPON tutorial
EPON – The need for standard
Goals:l Multi-vendor interoperability between OLT &
ONU
l Standard solutions acceptance by service providers
l Cost reduction due to availability of standard components (larger volumes, broader deployment)
l More bandwidth to the end user for less $$
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12 March 2001IEEE 802.3 EFM working group8
EPON tutorial
Ethernet PON (EPON) Protocol
l Using standard Ethernet frames
l OLT “broadcasts” Ethernet Frames to its ONUsl Each ONU transmits in turn using grants
issued by the OLT
l OLT regulates the amount of up-stream B/W given to each ONU by controlling the window size
l EPONP control frames are exchanged in-bandl Ranging is used to minimize inter-window gaps
![Page 9: Ethernet PON (EPON) Protocol - IEEE 802 · Ethernet PON (EPON) Protocol By Edward Beili 2 IEEE 802.3 EFM working group 12 March 2001 EPON tutorial](https://reader035.vdocuments.net/reader035/viewer/2022062302/5adeed777f8b9ab4688b771a/html5/thumbnails/9.jpg)
12 March 2001IEEE 802.3 EFM working group9
EPON tutorial
EPON transport – Requirements
l Reliable & Secure transport
l Voice requirements:– Constant delay– Low latency– Low jitter– Life-line
l Bandwidth Allocation (Static/Dynamic)
![Page 10: Ethernet PON (EPON) Protocol - IEEE 802 · Ethernet PON (EPON) Protocol By Edward Beili 2 IEEE 802.3 EFM working group 12 March 2001 EPON tutorial](https://reader035.vdocuments.net/reader035/viewer/2022062302/5adeed777f8b9ab4688b771a/html5/thumbnails/10.jpg)
12 March 2001IEEE 802.3 EFM working group10
EPON tutorial
EPON transport – Main functions
l Transmission grants
l ONU discovery/ID assignmentl Periodic sanity check (who is alive)
l Bandwidth allocation
l Security
l Error handling
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12 March 2001IEEE 802.3 EFM working group11
EPON tutorial
EPONP - Overview
l 100/1000BaseFX Phy is used at both ends
l Full duplex, 100/1000Mbps statically configured
l Flow-control (back-pressure) is turned off at both ends
l Frames are not segmented
l Short (64 byte) control frames (grants and messages) are periodically exchanged between LC and ONUs
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12 March 2001IEEE 802.3 EFM working group12
EPON tutorial
EPONP – Overview (2)
l Downstream– Ethernet traffic is broadcasted from OLT to all of its ONUs– OLT periodically sends a Start message containing grants for
1..N full cycles to its subtending ONUs– Each grant contains:
l Window_Size and Window_Offset per ONU
l Cycle_Sizel Number_of_Cycles
l Upstream– Each ONU buffers the upstream LAN traffic and sends it to the
OLT when its window is open.– Upstream B/W is controlled by the window size per ONU
![Page 13: Ethernet PON (EPON) Protocol - IEEE 802 · Ethernet PON (EPON) Protocol By Edward Beili 2 IEEE 802.3 EFM working group 12 March 2001 EPON tutorial](https://reader035.vdocuments.net/reader035/viewer/2022062302/5adeed777f8b9ab4688b771a/html5/thumbnails/13.jpg)
12 March 2001IEEE 802.3 EFM working group13
EPON tutorial
EPONP – Parameters
Window_Size_ONU1
ONU1
ONU2ONU3
ONU4
IWG - Inter Window Gap
Window_Offset_ONU1Start_of_Cycle
Cycle_Size
Number_of_Cycles
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12 March 2001IEEE 802.3 EFM working group14
EPON tutorial
EPONP - Parameter Limitations
EXAMPLE (100Mbps symmetric, 16 ONUs, no segmentation):
l (voice_frame + ctrl_frame + max_frame) <= Window_Size <= max Cycle_Size/16
l 2.5ms (16 x min Window_Size) <= Cycle_Size<= 20ms (max (max latency, max Voice_Delay)
l 0.96µs (IFG) <= IWG <= 4µs
![Page 15: Ethernet PON (EPON) Protocol - IEEE 802 · Ethernet PON (EPON) Protocol By Edward Beili 2 IEEE 802.3 EFM working group 12 March 2001 EPON tutorial](https://reader035.vdocuments.net/reader035/viewer/2022062302/5adeed777f8b9ab4688b771a/html5/thumbnails/15.jpg)
12 March 2001IEEE 802.3 EFM working group15
EPON tutorial
EPONP – Ranging
l Ranging procedure to minimize the guard time, using echo messages sent from OLT to ONUs:– OLT measures round trip delay for each ONU– OLT notifies each ONU of equalization delay: Te
– ONU adjusts transmission phase to Te
l Adjust the delay periodically to compensate for temperature changes, component aging etc.
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12 March 2001IEEE 802.3 EFM working group16
EPON tutorial
Bandwidth Allocation (BA)
l Upstream– Controlled by the OLT protocol state machine– Window size based – equal delay– Window rate based – variable delay
l Downstream– Rate limiting in the OLT or ONU
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12 March 2001IEEE 802.3 EFM working group17
EPON tutorial
BA – Upstream
Upstream Static BA (window size based)
Upstream Dynamic BA
ONU4 -> LifeLine
ONU1
ONU2ONU3
ONU4
Start
ONU1
ONU2ONU3
ONU4 ONU1
ONU2
ONU3
ONU4
ONU1
ONU2ONU3
ONU4
Start
ONU1
ONU2
ONU3
ONU4
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12 March 2001IEEE 802.3 EFM working group18
EPON tutorial
ONU discovery & ID assignment
l Static assignment– E.g. manual provisioning during ONU installation– …
l Auto-discovery– Binary Tree– Hashing (MAC) + Mask– Raffle– …
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12 March 2001IEEE 802.3 EFM working group19
EPON tutorial
Conclusion
l Topics to work on:– Building blocks / Parameters– Ranging– BA– PON discovery
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12 March 2001IEEE 802.3 EFM working group20
EPON tutorial
Acronyms
l CO Central Officel FTTB/C/Cab/H Fiber-To-The-
Business/Curb/Cabinet/Homel FSAN Full-Service Access Networkl OLT Optical Line Terminall ONT Optical Network Terminatorl ONU Optical Network Unitl PON Passive Optical Networkl POTS Plain Old Telephone Service
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12 March 2001IEEE 802.3 EFM working group21
EPON tutorial
References
l ITU-T G.983.1, “High Speed optical access systems based on Passive Optical Network (PON) techniques”
l ITU-T G.983.2, “The ONT Management and Control Interface Specification”
l ITU-T G.983.3, “A broadband optical access system with increased service capability by wavelength allocation“
l ITU-T G.959.1, “Optical transport network physical layer interfaces”.