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EPON solution with the example of equipment EXTRALINK ONT ONU OLT SFP PON
The article will describe the basics of the PON passive optical network and its principles of operation. Additionally, we will show a complete epon network using Extralink devices.
Passive Optical Network (PON) - is the most popular technology used to build efficient and affordable access networks. Taking into account the huge development of services such as Triple Play (Internet, TV, telephone) and greater demand for bandwidth, PON technology turns out to be the best solution.
Building a network in the PON (EPON/GPON) standard has many advantages, and perhaps the biggest advantage is related to the word "passive".
Practically, the entire network structure is built on passive elements, while active devices appear only in the central point of the network (OLT) and at the end customer (ONT), and between them there is only optical fiber and other passive elements like splitters.
The use of TDMA technology is also very effective - this allows very efficient use of the band and dynamic allocation of resources based on current customer requirements at a given moment.
In short, TDMA is a technique that uses a single physical channel that is divided into time slots, which are then allocated to individual users.
The principle is very simple: at the time of transmission from OLT to clients, i.e. downstream, the data is sent to all ONT terminals and it is they who decide to filter it and transmit it to the appropriate recipient.
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In the opposite situation - upstream - OLT allocates the appropriate number and duration of time slots on the basis of delays and the state of terminal device buffers. Therefore, the band is divided dynamically according to the real demand of individual ONTs.
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It was also worth knowing that all PON networks have been divided into 5 classes according to the optical track attenuation, as shown in the following table:
| Network class | A | B | B+ | C | C+ |
|---|---|---|---|---|---|
| Minimal attenuation between OLT and ONU | 5dB | 10dB | 13dB | 15dB | 18dB |
| Maximal attenuation between OLT and ONU | 20dB | 25dB | 28dB | 30dB | 31dB |
The EPON network uses the BPON structure to transmit Ethernet frames. Data is transferred at a speed of up to 1Gbps in both directions! It is also possible to connect up to 64 devices, and with a minimum ratio of 1:16 the optical power budget is 24dB.
PON networks consist of several basic elements:
OLT - Optical Line Terminal - hub, central unit. Aggregates and controls traffic and processes packets.
ONT - Optical Network Terminal - the device is designed for the end customer. Its task is to transmit data and voice and video transmission.
ONU - Optical Network Unit - these are devices designed for a larger number of recipients. It can contain more Ethernet or gigabit interfaces, support POTS (analog telephony) and create a WiFi network.
Splitter - a passive optical device that allows the signal from a fiber optic cable to be divided into successive fibers reaching the next splitters or into ONT or ONU. The divisions from 1:2 to 1:128 are available.
ODN - Optical Distribution Network - this is a network of optical fibers that extends between OLT, Splitters, ONU and ONT. The most important thing is that this network should have an adequate power budget, as its range depends on this factor.
To meet customers' requirements, www.batna24.com offeres the cheapest and extremely reliable devices to build the EPON network presented in the following diagrams.
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As you can see, we used EXTRALINK and TOTOLINK - and a new OLT EPON Extralink Predator.
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| Model | PREDATOR 8 PON |
|---|---|
| PON Chipset | Cortina-CS8022 |
| PHY Chipset | Broadcom-BCM54685 |
| FLASH | Spansion-S29GL128P10TFI01 |
| RAM | HYNIX-H5PS1G63JFR---128MB |
| CPU Chipset | BCM53314 |
Of course OLT is also available in a 4 port version.
| Model | RAPTOR 4 PON |
|---|---|
| PON Chipset | Cortina-CS8022 |
| PHY Chipset | Broadcom-BCM54685 |
| FLASH | Spansion-S29GL128P10TFI01 |
| RAM | HYNIX-H5PS1G63JFR---128MB |
| CPU Chipset | BCM53314 |
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The most interesting function that OLTs have is the management of the entire device structure through the EMS (Element management system). EMS is an integrated device management platform designed based on the standard SNMP protocol.
With EMS, administrators can efficiently manage and configure network devices - for example, you can quickly add or remove additional units ONT.
And the EMS allows:
EMS also supports the TR-069 (WAN Management Protocol) standard, through which the ACS server can perform automatic remote configuration and can collect data needed for network diagnostics.
Managing devices through the EMS platform is very user-friendly as the interface is clear and all connected devices can be easily found.
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VLAN Managment
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ONU Authority
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Of course, in addition to the configuration of OLTs, we have access to a detailed configuration of ONU client endings, where we can remotely configure all major functions.
For example, we can remotely set the input port speed for a specific group of packages: broadcast, multicast, flooded unicast etc.
You can remotely configure the VLAN, based on the appropriate modes: Transparent, Tag, Translate and Trunk:
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Then we connected the ONU EXTRALINK LUNA EPON 1GE (in bridge mode) to the OLT through the EXTRALINK 1:32 PLC SPLITTER SC/UPC 900UM.
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I will not describe the individual features of Extralink LUNA EPON 1GE here, because a detailed description of the device, along with the test, can be found in an earlier article.
Behind the ONT we installed a TOTOLINK A3002RU router (Diagram 1) and a TOTOLINK N300RT (Diagram 2) due to the fact, that we want to "drag" one vlan to IPTV and the other one to the Internet and A3002RU has Gigabit ports and is perfectly capable of handling these functions, and in addition, it was the only one to achieve such good results in the AC1200 tests - AC1200 routers test.
TOTOLINK N300RT also provides excellent VLAN and IPTV support. Although it works in the N300 band, in the tests it showed great possibilities.
Additionally, all TOTOLINK products have a 36 months warranty!!
Ok, and now most importantly:
The aim of this article was to create a reliable EPON network at the lowest possible cost of building the structure and connecting the end customer.
Therefore, we offer our Customers the following sets:
Set 1
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Set 2
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As a confirmation that we are offering the cheapest and most efficient solution available on the market, we suggest contacting our salesmen who will help with your orders.
You can find them here -> https://www.batna24.com/pl/kontakt
We would also like to invite you to visit our forum, where you will find an extensive section on
https://www.forum.anteny24.pl/
Author:
Leszek Błaszczyk
| Przykładowe rozwiązanie EPON w oparciu o sprzęt EXTRALINK.pdf | pobierz |
