EPON (Ethernet Passive Optical Networks) or GEPON (Gigabit Ethernet Passive Optical Networks), also known as Ethernet PON is an access layer technology to connect internet for the users through optical fiber. This technology is based on fiber network which renders fast data transmission and lower data packet loss. GEPON technology supports upto 20 kms. The downstream is broadcast and upstream is TDMA technology. From OLT to ONU the data packets are broadcasted and from ONU to OLT, each ONU is assigned time slots to fetch data using TDMA (Time Division Multiple Access) technology which avoid collision.
It is true that the OLT and the ONU are active devices, which need power input, but logically the whole GEPON network is based on Optical Fiber network. Fiber split ratio is determined and calculated to connect number of ONUs. This fiber network is PASSIVE network, where no active power is required. Hence, majority network design is on optical fiber and thus, GEPON is called A Passive Optical Network Technology.
GEPON technology is designed to supports 20 kilometres by standard.
The distance, GEPON supports is dependent on the split ratio of the optical fiber. Current EPON systems are designed as per 1*32 split ratio which can support upto 20kms. Further split will render shorter distance coverage. Also, it is widely dependent on the ONU optical receiving sensitivity which in general is -26 dbm. Hence, as per the technology standard calculations/specifications, current GEPON system can support maximum upto 20 kms.
There are various chipset OLTs available. With respect to Optilink OLTs we use,
OP-EOLT 97042P (2 PON Port OLT) - TK chipset
OP-EOLT 97084P (4 PON Port OLT) - Cortina Chipset OLT
OP-EOLT-97168P (8 PON Port OLT) - Cortina Chipset OLT
There are various chipset ONUs are available. We use TK, Cortina, ZTE, BroadCom and Realtek chipset ONUs.
ONU compatibility depends upon ONU CTC version. We have expertise in our Research and Development, which observe strong testing parameters and make the ONUs compatible with Optilink OLTs.
As per standard, all chipset ONUs can work with Optilink OLT. We cannot assure you that other brand ONUs be compatible with our OLT.
CTC is China Telecom. It is a standard derived for the ONUs as per China government. CTC is responsible for compatibility with different devices and also networking features an ONU can support.
We offer to have a network with same chipset devices but, since every chipset has its own advantages commercially and also with respect to networking requirements, we offer variety of ONUs to chose with.
PON SFP optical out ranges from +3 dbm to +5 dbm. The range varies as per module laser individually.
Yes, you can use any module which supports EPON standards provided it is compatible with Optilink OLT.
OLT flash memory is 128MB.
It is recommended to use PLC (Planar Lightwave Circuit) fiber splitter meant for GEPON technology.
|Splitter Ratio||Average Splitter Loss (in dB)|
Yes we can use the fiber splitter used in cable TV network. We recommend to use standard PLC splitter meant for GEPON technology for better network.
Yes. We have combo ports for UPLINK. You can use either fiber port or Ethernet port for input.
OLT supports RSTP. We recommend not to have OLT in ring as ring should always be on the Switching network. OLT is an access layer device. Always redundancy has to be on switch and below each switch, OLT should be connected.
NO. PON port supports 64 LLID (Logic Link Identification).
By standard, a particular PON port on an OLT supports 64 ONUs, so 65th ONU technically will not connect/register if all 64 ONUs is online at the same time on the OLT.
LLID is Logic Link ID. GEPON technology works on TDMA technology from downstream. ONUs observe TDMA technology, each ONU sends request in the prescribed time slots.
OLT support standard IEEE802.1 Q protocol. Optilink OLT supports VLAN1- 4094.
GEPON is FTTH solution. Also GEPON is bandwidth sharing device. The number of clients connected on GEPON will fetch bandwidth from OLT. We recommend to connect minimum user after ONU for best FTTH solution and to have network free from bandwidth choking.
Yes, ONU comes in 2 different modes, as Bridge mode and Router board mode. You can configure static IP, DHCP and PPPoe config on ONU with router board. Here we ask you why? You are losing on to some important factors in your network. To know the factor please contact our respective sales representative. We are happy to help you.
Yes, ONU port is of 1GE. You can assign 2Mbps, 10Mbps and much higher plans on ONUs. You can also assign 100Mbps Broadband plans.