How to choose EPON Equipment
OLT detail parameter
How to choose a suitable FTTH EPON equipment,especially for EPON OLT,which is a quite headache purchasing problem in fiber optic projects and daily telecom application,for its set of complicate technical specification parameters.
This blog post is trying to list all kinds of EPON （OLT/ONU）series product technical specifications and standards in detail,which will mainly focus on those interesting parameters by our buyers. Today we mainly introduce the follows factors:
- Device parameters
- Performance and capability
- EPON Interface (downlink) index
- Ethernet optical/electrial (uplink) interface
- Debug interface (OAM)
For better understanding full list of those technical specifications:such as device size,weight,operating environment and power parameter etc,we pick up a OLT device from FOT(Fiber Optic Telecom) EPON Product line,as an example/reference,in this whole post.
Here is introducing a high volume OLT device,one of FOT EPON OLT family members-8040F.
EPON Hardware characteristics Devices parameter Size(mm) 480*355*380(W*H*D)
Operating environment Environment temperature：0℃～+55℃；Environment humidity：10%-90%、without condensation;Environment humidity:10%-90%、without condensation
Store environment Environment temperature：-25℃～+70℃；Environment humidity：10%-90%、without condensation
power DC 46～75 DVC
AC 176～264 VAC
Performance and capability
Device interface Type Count
Uplink interface Two 10GE(XFP connector),eight GE interface (electricity port or SFP connector)
EPON interface Forty EPON SFP interface
Debug interface One,the interface meets RS232 standard
Out band management interface One,the interface meets 100Base-TX standard
1.25Gbit/s EPON interface
What is EPON interface?The EPON interface is the one interconnected between OLT and ONU,speed can reach to 1.25Gbit/s both in uplink and downlink directions.The table “EPON Ethernet optical interface”(below) introduces the interface technical indicators of FOT’s OLT series in detail.
Project 1.25Gbit/s EPON interface
Interface type SC/PC transmitter Signal nominal rate 1.25Gbit/s¡À100ppm
Average transmit power (max) +7dBm
Average transmit power (min) +2dBm
Average shut off the transmission power -39dBm
extinction ratio(min) +9dB
receiver Signal nominal rate 1.25Gbit/s¡À100ppm
Receive sensitivity(max) -27dBm
Ethernet optical interface
As we know,besides the downlink direction to ONU device via EPON interface,OLT also have another direction,uplink to local Telecom vendor’s network,like ” city Metro IP Network”.This Ethernet optical interface and the following Ethernet electrical interface belong to the OLT’s uplink direction category.
Project 1000Base-SX 1000Base-LX 10000Base-SR 10000Base-LR
Interface type LC/PC LC/PC LC/PC LC/PC
Interface rate 1000 Mbit/s 1000 Mbit/s 10000 Mbit/s 10000 Mbit/s
Standard IEEE 802.3z IEEE 802.3z IEEE 802.3ae IEEE 802.3ae
Centre wavelength 850nm 1310nm 850nm 1310nm
Maximum transmission distance 500m 20km 300m 10km
Maximum transmitting optical power -4dBm -3dBm -1dBm -1dBm
Minimum transmitting optical power -9.5dBm -11.5dBm -6dBm -6dBm
Minimum overload optical power 0 -3dBm 0 -1dBm
Maximum receive sensitivity -17dBm -19dBm -11dBm -14dBm
Minimum extinction ratio 9dB 9dB 3dB 6dB
Instruction：Ethernet optical interface indicator is decided by optical module. Above indicators only for reference.
Ethernet electrical interface
Interface type RJ45
Interface rate 10/100/1000Mbit/s self-adaption
Transmitting media Category 5 cable
Standard IEEE 802.3-2005
Transmission distance 100m
Interface type RJ-45
Interface standard Asynchronism EIA/TIA-232
Interface rate 9600bit/s
After showing those six “Performance,Capability and Interface parameters indicator” tables above,hoping it helps our readers to build a brief structure & profile of EPON equipment,especially for OLT device.So next time,before decide how to choose a FTTH EPON and related product,we could read this “structure & profile” in mind.
Next posts will go further discussion on EPON Performance and capability/Protocols and standards/Business characteristic and specification and so on.
Please keep following the coming chapter,thanks.
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