An EPON system uses the single-fiber wavelength division multiplexing (WDM) technology (with downlink central wavelength of 1490 nm and uplink central wavelength of 1310 nm) to implement single-fiber bidirectional transmission, supporting a transmission distance of up to 20 km (12.43 miles)

Wavelength: Tx 1310nm, Rx1490nm
Tx Optical Power: 0～5dBm
Rx Sensitivity: -27dBm
Saturation Optical Power: -8dBm

The OLT support Class B+.
Transmission Distance：20KM
PON port speed: symmetrical 1.25Gbps
Waves: 1310nm TX,1490nm RX
TX Optical power : 0～5dBm
RX Sensitivity: -27dBm

The ONU quantity connected to the OLT depend on the OLT PON ports quantity and optical splitter ratio.
For example, 2PON port OLT can connect 64pcs EPON ONU in 1:32 splitter ratio; If in 1:64 ratio, it can manage 128pcs ONU.

Ethernet Passive Optical Network (EPON), defined by IEEE 802.3ah, is a point to multipoint (Pt-MPt) network topology implemented with passive optical splitters, along with optical fiber PMDs that support this topology. EPON is based upon a mechanism named MPCP (Multi-Point Control Protocol), which uses messages, state machines, and timers, to control access to a P2MP topology. Each ONU in the P2MP topology contains an instance of the MPCP protocol, which communicates with an instance of MPCP in the OLT. On the basis of the EPON/MPCP protocol lies the P2P Emulation Sublayer, which makes an underlying P2MP network appear as a collection of point-to-point links to the higher protocol layers (at and above the MAC Client). It achieves this by prepending a Logical Link Identification (LLID) to the beginning of each packet, replacing two octets of the preamble. In addition, a mechanism for network Operations, Administration and Maintenance (OAM) is included to facilitate network operation and troubleshooting.

A fiber media converter ( MC for short) is a simple networking device that makes it possible to connect two dissimilar media types such as twisted pair with fiber optic cabling. They were introduced to the industry in the 1990s, and are important in interconnecting fiber optic cabling-based systems with existing copper-based, structured cabling systems. They are also used in metropolitan area network (MAN) access and data transport services to enterprise customers.

GPON (Gigabit-Capable PON) technology is based on the latest generation of broadband passive optical integrated access standard based on the ITU-TG.984.x standard. It has many advantages such as high bandwidth, high efficiency, large coverage and rich user interface. Most operators regard the access network as a broadband technology, integrated transformation of the ideal technology. GPON was originally proposed by the FSAN in September 2002. On this basis, ITU-T completed the formulation of ITU-T G.984.1 and G.984.2 in March 2003 and completed G in February and June 2004. 984.3 standardization. Which eventually formed a GPON standard family.

EPON compatible with the current Ethernet technology for the purpose of the 802.3 protocol in the optical access network continuation of the full inheritance of the Ethernet low prices, flexible protocol, mature technology and other advantages, with a wide range of markets and good compatibility.

The GPON is positioned in the telecommunications industry for multi-service, full-service access with QoS guarantees, and strive to find the best and most business-friendly solution with the highest efficiency. It proposes that “all agreements be openly and completely thoroughly Reconsider “.

Overall, EPON and GPON have their own strengths and weaknesses, from the performance indicators GPON is better than EPON, but EPON has the advantage of time and cost, GPON is catching up, looking forward to the future of broadband access market who may not be replaced, it should be Co-existence and complementarity. GPON will be more suitable for customers with high bandwidth, multi-service, QoS and security requirements and ATM technology as the backbone. For cost-sensitive, QoS, security, less demanding customer base, EPON has become the dominant.