Passive Optical Network - PowerPoint PPT Presentation


Title: Passive Optical Network


1
?????????? ??-?????? ???? ??????? ?????
?????? ?????? ?????? ???? ???????
Passive Optical Network -Protocols-
Present Rony Levin Email levinbr_at_ee.bgu.ac.il Co
urse Optical Communications Networks
Number 361-2-5571 Lecturer Prof. Dan Sadot
2
Agenda
  • Historical Overview
  • Terms Definition
  • PON Overview
  • PON Protocols Overview
  • PON Protocols Comparison
  • Summary

3
Communication Problem
Converter
  • If good network user connect to another user
    in the same network he can enjoy from high
    quality service, but if he will try to connect to
    user belong to bad network, the received
    service will be terrible.
  • Of course, he will accuse good network
    vendoroperator

4
Communication Problem
  • In order to avoid such kind of problems
    vendorsoperators have been compelled to
    cooperate, although they were competitors.
  • Communications protocol were developed to supply
    data streaming, using some kind of common used
    rules.
  • Today, when optical communication industry is
    developed, nobody wants to repeat previous
    mistakes

5
Who Is Who
  • FSAN Full Service Access Networks (from 1995)
  • ITU-T International Telecommunication Union
    Telecommunication Standardization Sector
  • IEEE Institute of Electrical and Electronics
    Engineers
  • Infonetics Research (www.infonetics.com) is an
    international market research and consulting
    firm specializing in telecom and data networking

6
How Does It Work
7
FTTx Fiber-To-The-x
  • FTTH - Home
  • FTTC - Curb
  • FTTN - Node or Neighborhood
  • FTTP - Premise
  • FTTB - Building or Business
  • FTTU - User
  • FTTZ - Zone
  • FTTO - Office
  • FTTD - Desk

8
Acronyms
  • OAN Optical Access Network
  • ODN Optical Distribution Network
  • ONU Optical Network Unit
  • OLT Optical Line Termination
  • ONT Optical Network Terminal
  • CO Central Office
  • QoS Quality of Service
  • SLA Service Level Agreement
  • AGC Automatic Gain Control

9
Vicious Cycle
Don't want to pay more for bandwidth or QoS
because there are no applications or services
that require them
Don't want to upgrade the networks because users
are not willing to pay for QoS or higher bandwidth
Don't want to develop new applications
or services because there is no
network infrastructure available to support them
User
Network Operator
Content Provider
10
Virtuous Cycle
Demand more bandwidth and QoS to receive new
applications and services
New infrastructure is deployed to support new
applications
User
Emergence of and competition among new
applications
Network Operator
Content Provider
11
Last/First Mile Problem
Metro-Area Network
Local Area and Home Network
Access Network Last/First mile
10 Gb/s Tb/s
1 Gb/s 40 Gb/s
1 Mb/s 1 Gb/s
  • Cooper wire technology
  • Dial-up 56Kb/s
  • DSL/Coax 100Kb/s5Mb/s

Backbone
12
PON - Last Mile Problem Solution
PON Passive Optical Network Point-to-multipoint,
consist of one OLT at the CO, OAN(20 km),
passive optical splitter and optical fibers, that
allow to serve one and more ONUs
13
First Mile Evolution
  • Point-to-point links
  • N fibers
  • 2N optical transceivers
  • Concentration switch in the neighborhood
  • 1 fiber
  • 2N2 optical transceivers
  • Electrical power in the field
  • PON a distributed switch
  • 1 fiber
  • N1 optical transceivers
  • No electrical power in field
  • Downstream broadcast

14
Fiber vs Cooper
  • Fiber is less costly to maintain than copper
  • based systems (though they are costly to
  • install)
  • PON transmission is conducted through a
  • single strand and thereby conserves fiber
  • PON conserves optical interfaces at the OLT
  • because a single fiber is used to service as
  • many as 32/64/128 end-user locations
  • Aggregation and concentration in the OLT

15
PON Architecture
16
PON Topologies
Tree topology
Ring topology
Bus topology
17
PON Standardization
  • ITU-T G.983
  • APON ATM Passive Optical Network
  • BPON Broadband PON, is a standard based on APON
  • ITU-T G.984
  • GPON Gigabit PON, is an evolution of the BPON
    standard
  • IEEE 802.3ah
  • EPON or GEPON Ethernet PON, is an IEEE/EFM
    standard for using Ethernet for packet data
  • IEEE 802.3av
  • 10GEPON 10 Gigabit Ethernet PON, is an IEEE Task
    Force for 10Gbit/s backwards compatible with
    802.3ah EPON

18
PON Standardization
  • ATM PON (APON)
  • First PON standard, primarily business
  • Broadband PON (BPON)
  • Expanded version of APON, supporting WDM,
    survivability, dynamic upstream, bandwidth
    allocation, higher upstream rates
  • Giga PON (GPON)
  • Evolution of BPON to higher rates, choice of L2
    support (Ethernet or ATM), enhanced security
  • Ethernet PON (EPON)
  • IEEE/EFM standard using Ethernet for packet data
  • 1.25Gpbs up/downlink, DBA, OAM, etc.

19
ATM
ATM has its roots in the telephone
business Connection-oriented protocol with
excellent QOS When a connection is made, it
exists for the entire communication session,
ensuring a reliable channel
20
Ethernet
Ethernet has its roots in office data
systems Connectionless-oriented, with excellent
efficiency Packets are transmitted individually,
requiring resources only when they are being
transmitted
21
TDM PON
  • Each ONU transmits in its own window (time slot)
  • All ONUs operate on the same wavelength with
    identical components
  • Most of the traffic flows downstream, but not
    peer to peer (user to user)
  • Two wavelengths are used 1310 nm (?1) for
    upstream transmission and 1550 nm (?2) for
    downstream transmission

22
TDM PON
23
EPON DOWNSTREAM TRAFFIC
  • In the downstream direction, Ethernet frames
    transmitted by the OLT pass through a 1N passive
    splitter and reach ONUs
  • Broadcast by nature
  • Packets are broadcast by the OLT and extracted by
    their destination ONU based on the media-access
    control (MAC) address

24
EPON DOWNSTREAM TRAFFIC
25
EPON UPSTREAM TRAFFIC
  • In the upstream direction, data frames from ONUs
    reach only the OLT, and not other ONUs
  • 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

26
EPON UPSTREAM TRAFFIC
27
WDM PON
  • Each ONU has dedicated wavelength

28
TDM-PON vs WDM-PON
29
PON Market
  • North American market GPON
  • Asia (Japan and Korea) EPON
  • Sales of Ethernet FTTH equipment surged 89 in
    2007 over 2006 . The number of worldwide PON and
    Ethernet FTTH subscribers topped 12.6 million in
    2007 and is forecast to grow to 80.5 million in
    2011

30
EPON vs GPON Framing
31
Protocol Comparison
32
Any Question?
33
Thank You for Attention
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Title: Passive Optical Network


1
?????????? ??-?????? ???? ??????? ?????
?????? ?????? ?????? ???? ???????
Passive Optical Network -Protocols-
Present Rony Levin Email levinbr_at_ee.bgu.ac.il Co
urse Optical Communications Networks
Number 361-2-5571 Lecturer Prof. Dan Sadot
2
Agenda
  • Historical Overview
  • Terms Definition
  • PON Overview
  • PON Protocols Overview
  • PON Protocols Comparison
  • Summary

3
Communication Problem
Converter
  • If good network user connect to another user
    in the same network he can enjoy from high
    quality service, but if he will try to connect to
    user belong to bad network, the received
    service will be terrible.
  • Of course, he will accuse good network
    vendoroperator

4
Communication Problem
  • In order to avoid such kind of problems
    vendorsoperators have been compelled to
    cooperate, although they were competitors.
  • Communications protocol were developed to supply
    data streaming, using some kind of common used
    rules.
  • Today, when optical communication industry is
    developed, nobody wants to repeat previous
    mistakes

5
Who Is Who
  • FSAN Full Service Access Networks (from 1995)
  • ITU-T International Telecommunication Union
    Telecommunication Standardization Sector
  • IEEE Institute of Electrical and Electronics
    Engineers
  • Infonetics Research (www.infonetics.com) is an
    international market research and consulting
    firm specializing in telecom and data networking

6
How Does It Work
7
FTTx Fiber-To-The-x
  • FTTH - Home
  • FTTC - Curb
  • FTTN - Node or Neighborhood
  • FTTP - Premise
  • FTTB - Building or Business
  • FTTU - User
  • FTTZ - Zone
  • FTTO - Office
  • FTTD - Desk

8
Acronyms
  • OAN Optical Access Network
  • ODN Optical Distribution Network
  • ONU Optical Network Unit
  • OLT Optical Line Termination
  • ONT Optical Network Terminal
  • CO Central Office
  • QoS Quality of Service
  • SLA Service Level Agreement
  • AGC Automatic Gain Control

9
Vicious Cycle
Don't want to pay more for bandwidth or QoS
because there are no applications or services
that require them
Don't want to upgrade the networks because users
are not willing to pay for QoS or higher bandwidth
Don't want to develop new applications
or services because there is no
network infrastructure available to support them
User
Network Operator
Content Provider
10
Virtuous Cycle
Demand more bandwidth and QoS to receive new
applications and services
New infrastructure is deployed to support new
applications
User
Emergence of and competition among new
applications
Network Operator
Content Provider
11
Last/First Mile Problem
Metro-Area Network
Local Area and Home Network
Access Network Last/First mile
10 Gb/s Tb/s
1 Gb/s 40 Gb/s
1 Mb/s 1 Gb/s
  • Cooper wire technology
  • Dial-up 56Kb/s
  • DSL/Coax 100Kb/s5Mb/s

Backbone
12
PON - Last Mile Problem Solution
PON Passive Optical Network Point-to-multipoint,
consist of one OLT at the CO, OAN(20 km),
passive optical splitter and optical fibers, that
allow to serve one and more ONUs
13
First Mile Evolution
  • Point-to-point links
  • N fibers
  • 2N optical transceivers
  • Concentration switch in the neighborhood
  • 1 fiber
  • 2N2 optical transceivers
  • Electrical power in the field
  • PON a distributed switch
  • 1 fiber
  • N1 optical transceivers
  • No electrical power in field
  • Downstream broadcast

14
Fiber vs Cooper
  • Fiber is less costly to maintain than copper
  • based systems (though they are costly to
  • install)
  • PON transmission is conducted through a
  • single strand and thereby conserves fiber
  • PON conserves optical interfaces at the OLT
  • because a single fiber is used to service as
  • many as 32/64/128 end-user locations
  • Aggregation and concentration in the OLT

15
PON Architecture
16
PON Topologies
Tree topology
Ring topology
Bus topology
17
PON Standardization
  • ITU-T G.983
  • APON ATM Passive Optical Network
  • BPON Broadband PON, is a standard based on APON
  • ITU-T G.984
  • GPON Gigabit PON, is an evolution of the BPON
    standard
  • IEEE 802.3ah
  • EPON or GEPON Ethernet PON, is an IEEE/EFM
    standard for using Ethernet for packet data
  • IEEE 802.3av
  • 10GEPON 10 Gigabit Ethernet PON, is an IEEE Task
    Force for 10Gbit/s backwards compatible with
    802.3ah EPON

18
PON Standardization
  • ATM PON (APON)
  • First PON standard, primarily business
  • Broadband PON (BPON)
  • Expanded version of APON, supporting WDM,
    survivability, dynamic upstream, bandwidth
    allocation, higher upstream rates
  • Giga PON (GPON)
  • Evolution of BPON to higher rates, choice of L2
    support (Ethernet or ATM), enhanced security
  • Ethernet PON (EPON)
  • IEEE/EFM standard using Ethernet for packet data
  • 1.25Gpbs up/downlink, DBA, OAM, etc.

19
ATM
ATM has its roots in the telephone
business Connection-oriented protocol with
excellent QOS When a connection is made, it
exists for the entire communication session,
ensuring a reliable channel
20
Ethernet
Ethernet has its roots in office data
systems Connectionless-oriented, with excellent
efficiency Packets are transmitted individually,
requiring resources only when they are being
transmitted
21
TDM PON
  • Each ONU transmits in its own window (time slot)
  • All ONUs operate on the same wavelength with
    identical components
  • Most of the traffic flows downstream, but not
    peer to peer (user to user)
  • Two wavelengths are used 1310 nm (?1) for
    upstream transmission and 1550 nm (?2) for
    downstream transmission

22
TDM PON
23
EPON DOWNSTREAM TRAFFIC
  • In the downstream direction, Ethernet frames
    transmitted by the OLT pass through a 1N passive
    splitter and reach ONUs
  • Broadcast by nature
  • Packets are broadcast by the OLT and extracted by
    their destination ONU based on the media-access
    control (MAC) address

24
EPON DOWNSTREAM TRAFFIC
25
EPON UPSTREAM TRAFFIC
  • In the upstream direction, data frames from ONUs
    reach only the OLT, and not other ONUs
  • 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

26
EPON UPSTREAM TRAFFIC
27
WDM PON
  • Each ONU has dedicated wavelength

28
TDM-PON vs WDM-PON
29
PON Market
  • North American market GPON
  • Asia (Japan and Korea) EPON
  • Sales of Ethernet FTTH equipment surged 89 in
    2007 over 2006 . The number of worldwide PON and
    Ethernet FTTH subscribers topped 12.6 million in
    2007 and is forecast to grow to 80.5 million in
    2011

30
EPON vs GPON Framing
31
Protocol Comparison
32
Any Question?
33
Thank You for Attention
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