ieee access standards, 802.3ah ge-pon · pdf fileitu-t workshop ip/optical, chitose, japan,...
If you can't read please download the document
TRANSCRIPT
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 1
IEEE Access Standards,802.3ah GE-PON Status
Gerry Pesavento [email protected]
JC Kuo [email protected]
Tetsu Koyama [email protected]
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 2
802.3ah Task Force in 802
802
Over-view
Archi-tecture
802.1
Mana-gement
802.3
CSMA/CD
802.2 Logical Link ControlIEEE Std 802.2, ISO 8802-2-1989
802.1 MAC BridgingIEEE Std 802.1D;1990
802.4
TBUS
802.5
TRING
802.6
DQDB
802.9
ISLAN
802.11
WLAN
802.12
DPAP
802.14
CATV
802.15
WPAN
802.16
BWA
802.17
RPR
OSILayer
2
OSILayer
1
802.10
SILS
IEEE
IEEE
ISO
IEEE
ISO
IEEE
ISO
IEEE IEEE IEEE IEEE
802.7 Broadband TAG (BBTAG) IEEE 802.7-1989
802.8 Fiber Optic TAG (FOTAG) IEEE 802.8-1987802.3ah
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 3
802.3ah Purpose and Scope
MAC Control
LLC - Logical Link ControlApplication
Presentation
Session
Transport
Network
Data Link
Physical
OSI LAN CSMA/CD Layers
To expand the application of Ethernet to include subscriber access networks inorder to provide a significant increase in performance while minimizing equipment,
operation, and maintenance costs.
Define 802.3 Media Access Control(MAC) parameters and minimal
augmentation of MAC operation,physical layer specifications, andmanagement parameters for the
transfer of 802.3 format frames insubscriber access networks at
operating speeds within the scopeof the current IEEE Std 802.3 and
approved new projects
MAC (CSMA/CD)
P2PPHY
P2MPPHY
Cu PHY
OAM
Scope
Purpose
Ethernet Access Network EAN
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 4
802.3ah Objectives
Support subscriber access network topologies: Point to multipoint on optical fiber Point to point on optical fiber Point to point on copper
Provide a family of physical layer specifications: 1000BASE-LX extended temperature range optics 1000BASE-X >= 10km over single SM fiber 100BASE-X >= 10km over single SM fiber PHY for PON, >= 10km, 1000Mbps, single SM fiber, >=1:16 PHY for PON, >= 20km, 1000Mbps, single SM fiber, >=1:16
PHY for single pair non-loaded voice grade copper, distance >=750m and speed >=10Mbps full duplex
( 802.3ah Objectives are as of May 2002)
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 5
Optical Ethernet First Mile
P2M PONT
P2PONT
P2PONT
P2MP and P2PSystem OLT +
Optical DistributionNetwork
DemarcationPoint
NetworkOperator
ServiceProviders
12
L3Service Multiplexing Switch
IPRouter
VoIPGW
VideoServer
SP1 SP2 SP3 SP4L3L2
Model 2
Model 1
IPRouter
VoIPGW
P2POLT
P2POLT
P2POLT
P2M POLT
L2 Bandwidth Concentration Switch
VideoServer
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 6
Not included in 802.3ah EPON
Bandwidth allocation algorithm (DBA) TDM and ATM support Security, Authentication WDM Overlay Plan Analog Video Outside Plant Protection, Diagnostics, Monitoring
Focus is P2MP Ethernet (narrow scope)
Reference FSAN
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 7
EPON uses Multi-Point Control Protocol (MPCP) to control Point-to-Multipoint (P2MP) fiber network
MPCP performs bandwidth assignment, bandwidth polling, auto-discovery process and ranging, and is implemented in the MAC Control Layer.
New 64 byte MAC Control messages are introduced. GATE and REPORT are used to assign and request bandwidth. REGISTER messages are used to control the auto-discovery process.
MPCP provides hooks for network resource optimization:- ranging is performed to reduce slack- reporting of bandwidth requirements by ONTs for DBA- optical parameters are negotiated to optimize performance
Multi-Point Control Protocol (MPCP)
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 8
ONT
performs auto-discovery process which includes ranging, assignment of Logical Link Ids, assignment of bandwidth
synchronizes to OLT timing through timestamps on the downstream GATE MAC Control Message
receives GATE Message and transmits in permitted time period
OLT
generates time stamped messages to be used as global time reference
generates discovery windows for new ONTs, and controls registration process
assigns bandwidth and performs ranging
ONT and OLT Operation
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 9
EPON Downstream
OLT ONU 2 USER 2
ONU 1
USER 3ONU 3
USER 1
1 3 1 2 1 3 1 2
13
12
13
12
1 1
2
3
header Payload FCS
802.3 frame
Physical broadcast of 802.3 Frames 802.3 Frames extracted by Logical Link ID in Preamble
64 byte GATE messages sent downstream to assign bandwidth
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 10
EPON Downstream: GATE Message
MAC Control Client
MAC Control
MAC
PHY
Clock register
Slot Start register
Slot Stop register
MAC Control Client
MAC Control
MAC
PHY
Generate GATEmessage
TimestampGATE message
Write registers
OLT ONU
Ups
trea
mD
ata
Pat
h
Start
Stop
Start
Stop
TS
Start
Stop
TS
Laser ON/OFF
Clock register
MA_CONTROL.request(GATE) MA_CONTROL.indication(GATE) MA_DATA.request( )
IN
S
CO
PE
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 11
EPON Upstream
OLT ONU 2 USER 2
ONU 1
USER 3ONU 3
USER 1
2
33 3
1 1
33
3
2
11
1 1 2 3 3 3
header Payload FCS
802.3 frame
time slot
Upstream control managed by MPCP protocol
Time slots contains multiple 802.3 Ethernet frames
64 byte REPORT Message sends ONU state to OLT
No collisions
No packet fragmentation
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 12
EPON Upstream: REPORT Message
MAC Control Client
MAC Control
MAC
PHY
Clock register
MAC Control Client
MAC Control
MAC
PHY
Generate REPORTmessage
Measure Round-Trip Time
OLT ONU
TBD
TBD
TBD
TBD
TSClock register
MA_CONTROL.request(REPORT)MA_CONTROL.indication(REPORT)
IN
S
CO
PE
TimestampREPORT message
TBD
TBD
TS-RTT register
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 13
RTT Measurement
1. OLT sends GATE at T1
2. ONU receives GATE at T1
3. ONU sends REPORT at T2
4. OLT receives REPORT at T3
5. OLT calculates RTT = T3 T2
T1 ...
GATE
T2 ...
REPORT
GATE
T1 ...
REPORT
T2 ...OLT
Rx
Tx
ONURx
Tx
T1
T1
T2
T3
(T2-T1)
(T3-T1)
RTT = (T3-T1) (T2-T1) = T3-T2
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 14
EPON specification will include Multi-Point Control Protocol, Point-to-Point Emulation, and two PMDs for 10 and 20 km using 1490/1310 nm.
Several issues are outstanding and are being discussed, including hooks for security and authentication. Consensus layer model anticipated to be approved this week in Vancouver.
802.3ah EPON standard moving to Draft phase July 2002. EFM standards anticipated by September 2003
ITU-T G.983 documents have been provided to 802.3ah
Summary
ITU-T Workshop IP/Optical, Chitose, Japan, 9-11 July 2002 15
802.3ah Information
802.3ah Ethernet First Mile Task Force
http://www.ieee802.org/3/efm/
802.3ah Baseline Technical Proposals
http://www.ieee802.org/3/efm/baseline/index.html