Table of Contents
Advertisement
EPON Overview
EPON Characteris-
tics
EPON Related
Concepts
and EPON/GEPON are PON-based technologies. They adopt the
different L2 technologies.
Ethernet in the First Mile Alliance (EFMA) brought forward EPON in
2001, which replaces ATM with Ethernet network on layer 2, and
IEEE 802.3ah working group standardized EPON. IEEE 802.3 EFM
working group released IEEE 802.3ah as EPON standard in June,
2004 (This standard was merged into IEEE 802.3-2005 standard)
to solve the problem of "the last one mile".
EPON is Ethernet network carrying on PON network, which sup-
ports 1.25Gbps symmetric rate. It is easy to deploy and maintain.
Meanwhile, EPON inherits simplicity and high efficiency from Ether-
net network. It is very suitable for wide-band access of IP service
to combine Ethernet and PON technologies together.
EPON needn't complex protocol and optical signal can be correctly
transmitted between central office and terminal. EPON applies
mature full duplex Ethernet technology and TDM( Time Division
Multiplex and Multiplexer). ONU sends data packet in its time slot
so it doesn't have conflict with other ONUs, which makes the best
use of the bandwidth.
�
All bearer devices in EPON network are passive, so the power
network is not required.
�
EPON adopts wavelength division multiplexing technology. The
uplink and downlink flow are transmitted on an optical fiber,
which saves a lot of fiber.
�
EPON works on physical and logical link layer. It is totally trans-
parent to the high level services and protocol.
�
EPON is point to multi-point access method, which saves the
port numbers on convergence side.
�
OLT: Optical Line Terminal. The convergence node on the di-
rection of uplink. It is the optical line terminal on central office
end.
�
ONU: Optical Network Unit. It is the access node of optical
network unit on subscriber side.
EPON Function of ZXR10 2900
ZXR10 2920 and ZXR10 2928 become ONU after loading PON
function daughter card. PON function daughter card is shown as
"RS-2800-1GE-SFF". When the uplink optical port of PON daugh-
ter card connects with OLT on central office side, switch accesses
EPON network system.
EPON network system has the ability to carry Ethernet/IP service
and can support voice service, TDM service and CATV service. ONU
supports OLT remotely manages it by extended OAM.
Confidential and Proprietary Information of ZTE CORPORATION
Chapter 7 Service Configuration
139
Advertisement
Table of Contents
