The most common passive optical network (PON) standards in current use are Ethernet passive optical network (EPON) and gigabit passive optical network (GPON). GPON is the most widely deployed optical system in today's fiber-to-the-home (FTTH) networks. Why choose GPON?

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Fiberstore White Paper | Why Choose GPON as Your FTTH Solution? 1
The most common passive optical network (PON) standards in current use are Ethernet passive
optical network (EPON) and gigabit passive optical network (GPON). GPON is the most widely
deployed optical system in today's fiber-to-the-home (FTTH) networks. Why choose GPON?
Fundamentals of GPON Infrastructure
GPON network mainly consists of two pieces of active transmission equipment, namely optical line
termination (OLT) and optical network unit (ONU) or optical network termination (ONT). GPON
adopts two multiplexing mechanisms. One is in downstream direction, from OLT to users. Data
packets are transmitted in an broadcast manner, but encryption (AES, advanced encryption
standard) is used to prevent eavesdropping. The other is in upstream direction, from users to OLT.
Data packets are transmitted in a time division multiple address (TDMA) manner. A single fiber from
the OLT runs to a passive optical splitter which is located near the users' locations. The optical
splitter merely divides the optical power into N separate paths to the users. The optical paths can
vary between 2 to 128. From the optical splitter, a single mode fiber strand run to each user.
Basic Services over GPON Network
There are several basic services provided by GPON system, such as triple-play, TDM and RF overlay
services.
Triple Play Solution in GPON
Most FTTH systems are so-called "triple play" systems offering voice (telephone), video (TV) and
data (Internet access). To provide all three services over one fiber, signals are sent bidirectionally
over a single fiber using several wavelengths of light. As triple play service is becoming popular,
more and more cable operators upgrade their coaxial cable network to EPON/GPON network or
triple play FTTH network to attract users and satisfy their diversified needs.
Why Choose GPON as
Your FTTH Solution?

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TDM Service Solution in GPON
Time division multiplexing (TDM) is a method of transmitting and receiving independent signals
over a common signal path by means of synchronized switches at each end of the transmission line
so that each signal appears on the line only a fraction of time in an alternating pattern. With fixed
upstream/downstream frame structure, periodic multiframes are transmitted in GPON line. So
GPON can transmit TDM service with first-born advantage. OLT supports processing TDM service in
Native and CESoP modes.
RF Overlay Service Solution in GPON
The RF (radio frequency) signal is distributed from a standard RF head-end through an E/O 1550 nm
laser transmitter. The RF signal is transported by a separate fiber network to the PoP station. Optical
protection of the primary and secondary signal routes is optional through a protection switch. A

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PON coupler combines the RF signal with the data traffic from the PoP OLT, which uses a different
wavelength (1490 nm), putting both wavelengths on the same fiber PON and distributing them
downstream through the splitters to the customer ONT/ONUs.
Advantages of GPON Networks
The clear advantage of PON networks generally is that a single shared optical fiber can support
multiple users through the use of inexpensive passive optical splitters. In GPON networks, up to 64
ONTs can share one fiber connection to the OLT. This makes GPON an attractive option for service
providers who want to replace copper networks with fiber networks, particularly in high-density
urban areas. Other advantages of GPON networks include:
 GPON specifies management protocols required for triple-play services over the network,
providing competitive all-service solution.
 GPON supports high-bandwidth transmission to break down the bandwidth bottleneck of the
access over twisted pair cables, so as to satisfy the requirements of high-bandwidth services,
such as IPTV and live TV broadcasts.
 GPON supports the long-reach (up to 20 km) service coverage to overcome the obstacle of the
access technology over twisted pair cables and reduce the network nodes.
 GPON supports voice in native PCM/TDM format and data in Ethernet format, and employs
wavelength division multiplexing (WDM) for downstream transmission.
 GPON offers twice the bandwidth of EPON/GEPON at its downstream speed of 2.5 Gbps, and it
also supports twice the split ratio, offering maximum flexibility and cost advantages for service
provider deployments.
 GPON was developed by the ITU-T to be an industry-wide interoperable standard.
Conclusion
Current and future demands for Internet access bandwidth have led to extensive deployment of

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FTTH technologies. Of these technologies, GPON provides the flexibility and cost advantages that
service providers need to deliver services profitably to their subscribers. To support the increasing
deployment of GPON in access networks worldwide, Fiberstore has developed full-featured ONT
devices that can deliver a range of services. These ONT devices offer simple indoor installation in
end-user residences and include additional features, such as support for VoIP, integrated WiFi, and
CATV overlay.
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Notice: This document is for informational purposes only and does not set forth any warranty, expressed or
implied, concerning any equipment, equipment features, or service offered or to be offered by Fiberstore.
Fiberstore reserves the right to make changes to this document at any time, without notice, and assumes no
responsibility for its use. This information document describes features that may not be currently available.
Contact a Fiberstore sales team for information on feature and product availability.
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