Ethernet Passive Optical Networks (GEPON or EPON) is the leading technology being used in FTTx (FTTH) deployments. PON is different than other optical network topologies in that it is a Point to Multi-Point (P2MP) topology. From the Central Office’s (CO) Optical Line Terminal (OLT, with SFP GEPON transceiver/module) a single strand of fiber goes out to a passive optical splitter where its signal is multiplied to 32(64) different lines. The Transmit and Receive signals operate on different wavelengths allowing bi-directional operation over a single fiber. Anything transmitted from the OLT is transmitted to all 32 lines. It is up to the customer’s system (Optical Network Unit - ONU) to determine what packets are for that customer. All other packets are discarded. The PON current standards have defined downstream data rates up to 1.25Gbps.

# IEEE 802.3ah. EPON or GEPON (Ethernet PON) is an IEEE/EFM standard for using Ethernet for packet data.

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Part No.	Data Rate (TX/RX)	Wavelength (TX/RX)	Form	Distance	DDM	Application
						GEPON	GPON	FTTx
EOLF-GEU5-X	1.25G	1310nm/1490nm	2×5	Up to 20km		ONU
EOLF-GEUA-X	1.25G	1310nm/1490nm	2×10	Up to 20km		ONU
EOLS-GEU-X	1.25G	1310nm/1490nm	SFP	Up to 20km		ONU
EOLF-GET5-X	1.25G	1490nm/1310nm	2×5	Up to 20km		OLT
EOLF-GETA-X	1.25G	1490nm/1310nm	2×10	Up to 20km		OLT
EOLS-GET-20	1.25G	1490nm/1310nm	SFP	Up to 20km		OLT
EOLS-GET-10	1.25G	1490nm/1310nm	SFP	Up to 10km		OLT