Huawei AR1200 series Configuration Manual page 165

Huawei AR1200 Series Enterprise Routers
Configuration Guide - Interface Management
Table 15-1 Upstream and downstream transmission
Upstream (TDMA)
l The optical wavelength is 1310 nm.
l Each ONU sends data to the OLT within
l Collision detection is not required.
l GPON supports packet fragmentation,
EPON and GPON
The main PON technologies are Ethernet PON (EPON) and gigabit PON (GPON). The EPON
standard was defined by the IEEE 802.3ah working group, and the GPON standard was defined
by the International Telecommunication Union (ITU) and the Full Service Access Networks
(FSAN).
The Ethernet in the First Mile (EFM) task force, founded in November 2000, brought forward
the EPON concept and described it in IEEE 802.3ah. EPON integrates the Ethernet and PON
technologies and provides 1.25 Gbit/s symmetric transmission rate on upstream and downstream
links. An EPON network is a point-to-multipoint gigabit optical access system. The EPON
technology complies with IEEE Ethernet standards and is a good choice for migration to the all-
IP network.
ITU and FSAN developed and standardized the GPON technology. This technology uses the
Generic Framing Procedure (GFP) defined by ITU-T to encapsulate Ethernet, time division
multiplexing (TDM), and Asynchronous Transfer Mode (ATM) packets at Layer 2. The
downstream transmission rate can be 1.25 Gbit/s or 2.5 Gbit/s; the upstream transmission rate
can be 155 Mbit/s, 622 Mbit/s, 1.25 Gbit/s, or 2.5 Gbit/s. The GPON technology provides a
higher transmission rate and supports more services than the EPON technology, but it is more
complicated and expensive and is not as mature as the EPON technology.
PON is becoming the mainstream bearer technology for the next generation access network
because of its advantages of long transmission distance, high QoS guarantee, and high
bandwidth.
Table 15-2 Comparison between EPON and GPON
Item
Downstream rate
Upstream rate
Split ratio
Maximum
transmission
distance
Issue 01 (2012-04-20)
the allowed time range.
while EPON does not.
1250 Mbit/s
1250 Mbit/s
Depending on the
optical power budget
10 km or 20 km
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Downstream (Broadcasting)
l The optical wavelength is 1490 nm.
l Data sent from the OLT is forwarded to
each ONU by the POS.
l Each ONU accepts only its own data and
discards data of other ONUs.
EPON
155 Mbit/s, 622 Mbit/s, 1244 Mbit/s, or 2488
Depending on the optical power budget
15 PON Interface Configuration
GPON
1244 Mbit/s or 2488 Mbit/s
Mbit/s
20 km
155