A Guide to choose EPON equipment-OLT parameters

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.

FTTH PON Lab Equipment list

FTTH PON Lab Equipment list

  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. 

4-40PON GEPON OLT

FOT EPON OLT-8040F(front panel)

Device parameters

EPON Hardware characteristics  
Devices parameterSize(mm)480*355*380(W*H*D)
Weight25Kg
Power≤600W
Operating environmentEnvironment temperature:0℃~+55℃;Environment humidity:10%-90%、without condensation;Environment humidity:10%-90%、without condensation
Store environmentEnvironment temperature:-25℃~+70℃;Environment humidity:10%-90%、without condensation
powerDC46~75 DVC
AC176~264 VAC

Performance and capability
Device interfaceTypeCount
Uplink interfaceTwo 10GE(XFP connector),eight GE interface (electricity port or SFP connector)
EPON interfaceForty EPON SFP interface
Debug interfaceOne,the interface meets RS232 standard
Out band management interfaceOne,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 typeSC/PC
transmitterSignal nominal rate1.25Gbit/s¡À100ppm
wavelengths1480nm~1500nm
Average transmit power (max)+7dBm
Average transmit power (min)+2dBm
Average shut off the transmission power-39dBm
extinction ratio(min)+9dB
receiverSignal nominal rate1.25Gbit/s¡À100ppm
wavelengths1260nm~1360nm
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.

Project1000Base-SX1000Base-LX10000Base-SR10000Base-LR
Interface typeLC/PCLC/PCLC/PCLC/PC
Interface rate1000 Mbit/s1000 Mbit/s10000 Mbit/s10000 Mbit/s
StandardIEEE 802.3zIEEE 802.3zIEEE 802.3aeIEEE 802.3ae
Centre wavelength850nm1310nm850nm1310nm
Maximum transmission distance500m20km300m10km
Maximum transmitting optical power-4dBm-3dBm-1dBm-1dBm
Minimum transmitting optical power-9.5dBm-11.5dBm-6dBm-6dBm
Minimum overload optical power0-3dBm0-1dBm
Maximum receive sensitivity-17dBm-19dBm-11dBm-14dBm
Minimum extinction ratio9dB9dB3dB6dB

  Instruction:Ethernet optical interface indicator is decided by optical module. Above indicators only for reference.

Ethernet electrical interface

Project10/100/1000Base-T
Interface typeRJ45
Interface rate10/100/1000Mbit/s self-adaption
Transmitting mediaCategory 5 cable
StandardIEEE 802.3-2005
Transmission distance100m

Debug interface

ProjectInstruction
Interface typeRJ-45
Interface standardAsynchronism EIA/TIA-232
Interface rate9600bit/s
ChassisSWA

  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.

More posts about this topics:

FULL video: FTTH EPON OLT/ONU connection and configuration

FOT’s FULL video guidance for installing EPON EMS

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