Why need FTTx—bandwidth
Data bandwidth requirement
Nowadays, normally SDTV need 2-4 Mb/s when
transmitting in IP network.
HDTV need 5 times of the bandwidth of SDTV
Each static photo can reach the size as 1MB
The audio flow of 5.1 passage can reach ~380 kb/s
Why need FTTx — transmission length
Twisted Pair Co-axial M ultimode Single-mode
The typical length for transmitting system capacity of 1Gbps
The limited transmission length and bandwidth of current ADSL
GEPON－Gigabit Ethernet Passive Optical Networks fiber
access technology is developing for point to multi-point
application. It is a mature access technology based on ethernet.
GEPON is composed by：
OLT－－Optical Line Terminal
ONU－－Optical Network Unit
POS－－Passive Optical Splitter
ODN－－Optical Distribution Networks
GEPON uses single fiber WDM technologies:
Downlink 1490nm ； ONU 1
Uplink 1310nm ； Optical Data
transmitter Medium transmit
can be used in CATV ；
WDM transmitconnect m
1550nm Optical connec
receiver t logics
OLT ONU 2 2
Data logics Optical
ONU 3 3
The advantages of GEPON
Uplink and downlink up to the symmetry bandwidth of 1Gb/s
Long transmit length, up to 10-20KM
Offer data, voice, and video, realize three in one network
Sustain max split ratio 1：64(10km)
Multi-users use one fiber, save trunk fiber and launched cost
Low requirement of maintenance, the whole network uses passive fiber
optic devices, no outdoor active devices
Low fiber loss, better anti-jamming ability
Adopt large quantity of chips with mature ethernet technology, easy to
implement, lower cost
End user can get high speed bandwidth as 100/1000Mbps
Compatible with existing ethernet, no need protocol conversion
Relative standards are quite mature, like IEEE802.3ah
Offer good QoS guarantee for different operation, etc..
2Fonet GEPON products advantages
High performance / price ratio —— Among all current same
kind products, 2Fonet GEPON products’ performance / price
ratio is the highest.
Long transmit length —— sustain 27-29dB attenuation, if more
than 802.3ah（26dB）, the transmit length will be even longer.
Support complete layer 2 and 3 function —— OLT2000 not only
has layer 2 function, but also has complete layer 3 operation
function. Decrease the higher layers’ pressure, offer better local
High density of ports ——1U has connect ability with 8 PON
ports, standard 42U chassis can connect to 4096 ONUs.
High security —— Except offering 128 digits AES encrpytion
tachniques, also offer powerful Access Control List (ACL)
function, which will increase the network security.
2Fonet OLT3000 is a highly integrated OLT device. It is with 4 uplink
port modules and 2 downlink port modules (each module with 4 port
modules). These modules can be SFP module, and all are hot pluggable.
2 power modules, which can be back up. AC or SC is ok. This OLT can
connect to max 256 ONUs. It is the preferred network access project of
intelligent residential district, office building, and other dense users.
2Fonet also offer 3 types of ONU, including currently main network
environment application, which family and corporation prefer.
ONU400--4 RJ45 port for data
ONU420--4 RJ45 and 2 RJ11 ports for data and voice
ONU421--4 RJ45, 2 RJ11, and 1 CATV port for data, voice and videoFor
more information, please browse：http://www.2fonet.com