Abbreviations Associated With GEPON:
1. What is GEPON technology?
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.
2. How many kilometres will GEPON technology support?
GEPON technology is designed to supports 20 kilometres by standard.
3. Why GEPON technology supports only 20 kms?
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.
3. Why GEPON technology supports only 20 kms?
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.
4. Chipset used in Nepstech OLTs?
There are various chipset OLTs available. With respect to Nepstech OLTs we use, ZTE Chipset, Broadcom Chipset.
5. Chipset used in Nepstech ONU?
There are various chipset ONUs are available. We use TK, Cortina, ZTE, BroadCom and Realtek chipset ONUs.
6. Will different chipset ONUs work with Nepstech OLT?
Our OLT is Open source and compatible with most of the third party ONUs. We have strong Research and Development team, who follow the thorough testing parameters and make the ONUs compatible with Nepstech OLTs.
7. What if I use a different brand ONU with Nepstech OLT?
As per standard, all chipset ONUs can work with Nepstech OLT. We cannot assure you that other brand ONUs be compatible with our OLT.
8. What is CTC in ONU?
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.
9. What are the devices involved in deploying GEPON Technology?
10. what are the different OLT configurations available?
4 PON port OLT
8 PON port OLT
16 PON port OLT
11. what is the optical power output of PON SFP module, used on OLT?
PON SFP optical out ranges from +3 dbm to +5 dbm. The range varies as per module laser individually.
12. can we use +7dbm modules in OLT?
Yes, you can use any module which supports EPON standards provided it is compatible with Nepstech OLT.
13. How much is the OLT Flash memory?
OLT flash memory is 128MB
14. what kind of fiber splitter used in GEPON Network?
It is recommended to use PLC (Planar Lightwave Circuit) fiber splitter meant for GEPON technology.
|
Splitter Ratio |
Average Splitter Loss (in dB) |
|
1*2 |
3.5 |
|
1*4 |
6.5 |
|
1*8 |
9.7 |
|
1*16 |
13.4 |
|
1*32 |
15.8 |
|
1*64 |
18.7 |
15. can we use the fiber splitter available in cable TV network?
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.
16. can I give fiber input to the OLT?
Yes. We have combo ports for UPLINK. You can use either fiber port or Ethernet port for input.
17. Can I use OLT in ring network?
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.
18. How many ONU on 1 PON port can be connected?
PON port supports 64 LLID (Logic Link Identification).
19. What will happen if more than 64 ONU connected in the PON port?
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.
20. How does ONU get LLID?
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.
21. Does OLT support VLAN configuration?
Yes.
22. Does ONU support VLAN configuration?
Yes.
23. How many VLAN I can configure on OLT?
OLT support standard IEEE802.1 Q protocol. Optilink OLT supports VLAN1- 4094.
24. Can we connect Ethernet switch after an ONU?
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.
25. Can I configure router configuration on ONU?
Yes, ONU comes in 2 different modes, as Bridge mode and Router mode. You can configure static IP, DHCP and PPPoe config on ONU with router mode. 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.
26. Can I use ONU for lease line plans?
Yes, ONU port is of 1GE. You can assign 2Mbps, 10Mbps and much higher plans on ONUs. You can also assign 100Mbps Broadband plans.
27. How many ONU on 1 PON port can be connected in GPON?
One PON port supports 128 LLID (Logic Link Identification).
28. what is Upstream and Downstream bandwidth in GPON?
In GPON the upstream bandwidth is 1.25G and downstream bandwidth is 2.5G
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