What is PON?
Introduction to PON and the Market
1；The Mission of PON
The mission of PON is to deliver “all broadband applications” to homes and
businesses at affordable cost.
Where are we in the ALU end-to-end networking solution?
What is PON?
PON = Passive Optical Network (无源光网络)
Passive = Not powered by electricity ;无电源à无源；
Passive device = a device without need for power, such as a POS (分光器)
Active device = a device that needs power, such as a switch (交换机)
But why PON?
Assuming that we want to connect about 500 users/businesses using fibers, but we
can use just one fiber from CO, because fibers in CO are scarce.
We will need to use 21 of 24 ports LAN switches to branch out from 1 to 504
In the field, it’s going to look like the following slide:
Case study: from “active network” to “passive network” in green areas
PON system components
OLT – CO device (局端设备)
ONT or ONU – User device (用户端设备)
POS – Passive Optical Splitter (无源分光器)
ONT or ONU
POS - Passive Optical Splitter
PON Network Topology
How does PON work - downstream?
From network to users:
1.OLT broadcasts constantly？and ONT chooses its contents selectively
How does PON work - upstream?
Key PON variances
APON = ATM + PON (starting mid 90s)
EPON = Ethernet + PON (starting 2000)
Cheaper and faster EPON pressured APON to evolve:
APON - BPON (Broadband PON) à GPON (Gigabit PON)
WDM-PON = Wavelengths + PON
The World Goes the PON Way
China EPON Market Competition (as of Sep. 2008)
Current Status of Worldwide FTTX Market
FTTX represents a group of choices
AT&T (美国) uses FTTN, which is GPON + VDSL2
Verizon (美国) adopts GPON FTTH
France Telecom (法国) adopts GPON FTTH
NTT;日本； adopts EPON FTTH
SK(韩国；adopts EPON FTTH
China Carriers (中国) will use all options
FTTX Product Portfolio
ASB GPON/EPON Product Portfolio