Question 1

Abbreviations associated with GEPON –

Accepted Answer

PON: Passive Optical Network
EPON: Ethernet Passive Optical Network
GEPON: Gigabit Ethernet Passive Optical Network
OLT: Optical Line Terminal
ONU: Optical Network Unit
POS: Passive Optical Splitter

Question 2

What is GEPON technology?

Accepted Answer

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 an optical fiber. This technology is based on a fiber network which renders fast data transmission and lowers data packet loss. GEPON technology supports up to 20 km. 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) technologies which avoid the collision.

Question 3

Why GEPON is called Passive Network?

Accepted Answer

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 the 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.

Question 4

How many kilometres will GEPON technology support?

Accepted Answer

GEPON technology is designed to supports 20 kilometres by standard.

Question 5

Why GEPON technology supports only 20kms?

Accepted Answer

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 up to 20kms. The 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, the current GEPON system can support a maximum of up to 20 km.

Question 6

Chipset used in Optilink OLTs?

Accepted Answer

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

Question 7

Chipset used in Optilink ONUs?

Accepted Answer

There are various chipset ONUs are available. We use TK, Cortina, ZTE, BroadCom and Realtek chipset ONUs.

Question 8

Will Different chipset ONUs work with Optilink OLT?

Accepted Answer

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.

Question 9

What if I use a different brand ONU with Optilink OLT?

Accepted Answer

As per standard, all chipset ONUs can work with Optilink OLT. We cannot assure you that other brand ONUs be compatible with our OLT.

Question 10

What is the difference between GEPON and GPON?

Accepted Answer

GPON: GPON stands for Gigabit Passive Optical Networks. It is a point-to-multipoint access mechanism.
Its important attribute is the use of passive splitters in the fiber distribution network, enabling one single
fiber feed from the provider's central office to serve multiple homes and small businesses.

GPON which is explained in ITU-T recommendation series G.984.1 through G.984.6 GPON, has a
the downstream capacity of 2.5 Gb/s and an upstream capacity of 1.25 Gbps that is shared among users.
Encryption is used to keep each user's data secure and private from other users.

A GPON network consists of OLT (Optical Line Terminals), ONU (Optical Network Unit), and a splitter.

GEPON: GEPON stands for Gigabit Ethernet Passive Optic Networks. It is composed of the Optical Line
Terminal (OLT), Optical Distribution Network (ODN) and Optical Network Unit (ONU). GEPON is a
perfect combination of Ethernet technology and passive optical network technology. It eliminates the
usage of active fiber optic components between OLT and ONU, this will greatly cut the cost and make
the network easier to maintain. GEPON use WDM technology and it is with 1Gbps bandwidth and up to
20km working distance.

Question 11

What is CTC in ONU ?

Accepted Answer

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.

Question 12

Why is Optilink not using same chipset for OLT and ONU ?

Accepted Answer

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.

Question 13

What are the devices involved in deploying GEPON Technology?

Accepted Answer

OLT device at the control room.
ONU device for clients.
PON SFP module.
POS (Passive Optical Splitter).
Fiber patch cord.
Fiber power meter.
A trained Fiber operation team.
Laptop/PC system to monitor.

Question 14

What are the Different OLT configurations available?

Accepted Answer

OP-EOLT 97042P - 2 PON port OLT
OP-EOLT 97084P – 4 PON port OLT
OP-EOLT 97168P – 8 PON port OLT
OP-EOLT 97016P – 16 PON port OLT

Question 15

What is the optical power output of PON SFP module, used on the OLT?

Accepted Answer

PON SFP optical out ranges from +3 dbm to +5 dbm. The range varies as per module laser individually.

Question 16

Can we use +7 dbm modules in OLT?

Accepted Answer

Yes, you can use any module which supports EPON standards provided it is compatible with Optilink OLT.

Question 17

How much is the OLT flash memory?

Accepted Answer

OLT flash memory is 128MB.

Question 18

What kind of fiber splitter used in GEPON Network?

Accepted Answer

It is recommended to use PLC (Planar Lightwave Circuit) fiber splitter meant for GEPON technology.

Question 19

Can we use the fiber splitter available in cable TV network?

Accepted Answer

Yes, we can use the fiber splitter used in a cable TV network. We recommend using standard PLC Splitter meant for GEPON technology for a better network.

Question 20

Can I give fiber input to the OLT?

Accepted Answer

Yes. We have combo ports for UPLINK. You can use either fiber port or Ethernet port for input.

Question 21

Can I use OLT in ring network?

Accepted Answer

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.

Question 22

How many ONU on 1 PON port can be connected?

Accepted Answer

NO. PON port supports 64 LLID (Logic Link Identification).

Question 23

What will happen if more than 64 ONU connected in the PON port?

Accepted Answer

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.

Question 24

How does ONU get LLID?

Accepted Answer

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.

Question 25

Does OLT support VLAN configuration?

Accepted Answer

YES

Question 26

Does ONU support VLAN configuration?

Accepted Answer

YES

Question 27

How many VLAN I can configure on OLT?

Accepted Answer

OLT support standard IEEE802.1 Q protocol. Optilink OLT supports VLAN1- 4094.

Question 28

Can we connect Ethernet switch after an ONU?

Accepted Answer

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.

Question 29

Can I configure router configuration on ONU?

Accepted Answer

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.

Question 30

Can I use ONU for Lease line plans?

Accepted Answer

Yes, ONU port is of 1GE. You can assign 2Mbps, 10Mbps and much higher plans on ONUs. You can also assign 100Mbps Broadband plans.

Question 31

What are Media Converters?

Accepted Answer

Media Converter converts and extends signals within your Ethernet network beyond the 100-meter limit imposed by copper cable. It improves the potential of present fiber with WDM wavelengths. Media converters are devices used to connect two LANs or devices that are not entirely relatable, due to operation types, different speeds, modes or media types (twisted pair, fiber, coax). They are most commonly used to insert fiber segments into copper networks.

It helps to integrate new technology with existing equipment to support new technologies, applications and future growth. Extend the productive life of your existing cable as well as the active equipment without costing, across-the-board upgrades.

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