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Useful Guidelines for EPON Solutions Design (Pt. 2)

This is the second part of an article in which we talk about some of the considerations that must be taken into account when designing an EPON solution.

Those considerations, as already mentioned, are:

1. Bandwidth Requirements
2. Network Nodes
3. Splitting Architecture
4. Distance
5. Optical power budget
6. Services to provide
7. Updating the existing network
8. Cables

In the first part we talked about Bandwidth Requirements, Network Nodes and Splitting Architectures, here we will discuss the rest.

4. Distance:

a) EPON can support a transmitting distance of about 20 Km under a 1:32 splitting ratio, and about 10 Km under a 1:64 splitting ratio

b) The distance mainly depends on the optical loss. The higher the optical loss is, the shorter the transmitting distance will be

c) If the transmitting distance of the cable is more than 2 Km, fiber splicing should be taken into account

For nodes in different distances we may use FBT splitter to distribute more optical power to a farther node and less optical power to a closer node thus making sure all the nodes get enough optical power

5. Optical Power Budget:

Certain aspects must be taken into account when calculating optical power for an EPON Solution, like:

- Fiber cable length
- Light wavelength
- Adapter quantity
- Connector quantity
- Splitters

Here we have an example of different factors that cause optical power loss in a solution:

6. Services to Provide:

EPON provides services such as data, IPTV/CATV and VoIP, widely used in various applications like FTTH, FTTB, FTTC, triple play, security systems, video surveillance systems, intelligent communities, city hotspots (airport, station, etc.), Wi-Fi access, and even TDM over EPON.

Here are some widely used topologies:

FTTH Topology:

FTTB/C Topology:

EPON Surveillance Topology:

7. Updating the Existing Network:

- Update the existing network by adding cables and devices to provide new services.
- CATV coaxial network can be upgraded to HFC network to provide triple play service by adding EOC devices.
- Pure data EPON network can be upgraded to provide CATV service by adding WDM devices.
- CATV fiber optical network can be upgraded to provide triple play service.
- Former fiber optical network can also be upgraded to provide services for a wider area and more users

8. Cables:

Feeder Fiber Cable:
- Feeder Cable connecs the cable from the ODF in the central office to the splitter distribution cabinet in the LCP
- Direct burial, duct, or aerial installation

Distribution Fiber Cable
- For connection Splitter distribution point to fiber distribution point
- Indoor or outdoor application

Drop Cable:
- The last-mile of the ODN, from the fiber distribution point to the user terminal
- Direct burial, duct, or aerial installation

Cabling Topology:


And those are the main points to take into account when designing an EPON Solution.

22:28 Écrit par frequence2 | Tags : ftth, fiber optique | Lien permanent | Commentaires (0) | |  Facebook | | | | |