Download - Ftth overview training lumini net

Lumbini Net Pvt. Ltd.

FTTH- Basics & OverviewPunit Manandhar

April 2, 2014


Overview

• FTTX- It is a generic term for network using Optical Fiber. The types can be:

FTTN- Fiber to the NodeFTTC- Fiber to the Curb / CabinetFTTP- Fiber to the PremisesI. FTTB- Fiber to the BuildingII. FTTH- Fiber to the Home


Overview

• AON (Active Optical Network)

- AON is a fiber network that uses fiber and active components like repeaters and amplifiers for network distribution.- Expensive compared to passive networks.- High coverage range (~100kms) due to regeneration of signals.- Consumes lots of fiber.- Currently being used for enterprise network.


Overview

• PON (Passive Optical Network)

- A PON is a fiber network that only uses fiber and passive components like splitters and combiners for network distribution.- Less costly than active networks.- Low coverage range (<20kms) due to limited signal strength.- Less fiber and central equipment required compared to Point-to-Point architecture.- It is the basis for FTTH.


Types of PON

• GPON (Gigabit PON)- The one which we will use-Separate encapsulation method is used called as GEM (Gigabit Encapsulation Method).-Data rate is upto 2.5Gbps.

• EPON (Ethernet PON)--The data are carried on Ethernet frames. It is carried over IP network.- Data rate is upto 1 Gbps.


PON Topologies


FTTH

- Typical arrangement is for Point-to-Multipoint network.

- Form of Fiber-optic communication that delivers high speed service to customer home or living space.- Can be used for Triple play service (Data, Video, Voice).- High bandwidth for OTT (Over the Top) content delivery.- FTTH is the total network comprising from OLT to ONU/ONT.- The downstream is on wavelength 1490nm and upstream is on 1310nm. For video it is 1550nm.- In GPON, in the downstream, the data packets are broadcasted and in upstream, transmission of data are done through TDMA (Time Division Multiple Access). That means, time slots are provided to each ONU.


FTTH

Fig: Typical FTTH network topology


OLT (Optical Line Terminal)


FTTH

• Advantages:

I. A single core can be separated into multiple cores, hence the usage of fiber can be drastically reduced.

II. Passive components are used for distribution, so point of failures are reduced.

III. Low cost of deployment compared to Active network.IV. Higher data ratesV. Power requirement is extremely less, since only OLT needs to

be powered up.VI. Value added service such as Video and VoIP without any

network upgrade.


FTTH

• Disadvantages:

I. Monitoring is an issue due to passive network.II. Much expensive regarding network coverage

compared to Wireless network.III. Complicated installation as optical power level

is of prime importance on this type of setup.IV. Multiple points of loss (Cable loss, Connector

loss, Splitter loss, Splicing loss, etc.)


*Optical Link Budgeting

• P = L*a+N1*b+N2*c+N3*d+N4*e+f,Where,P= Optical power level,L= length of optical fiber & a= fiber loss (dB) / km,N1= no. of fusion splicing & b= splicing loss per pt.,N2= no. of connectors & c= connector loss,N3= no. of mechanical splicing & d= mechanical splicing lossN4= no. of splitters & e= splitter loss, andF= engineering margin (2 dB)


Optical Fiber loss

• Loss according to Wave length 1310nm- 0.38 dB 1490nm- 0.3 dB 1550nm- 0.22 dB


Splitter loss


Other losses

• Fusion splicing- 0.1 dB• Connector loss- 0.2 dB• Mechanical splicing loss- 0.3 dB

4

16

4

4

4

pon

odf

Patch cord loss 0.2 dB

Connector + FS= 0.3 dB

Connector + FS= 0.3 dB

2 (Connector + MS)= 0.5 dB x 2 = 1 dB

Link Budget

No of patch cord= 1 x 0.2 dB = 0.2 dB

No of connector and FS= 2 x 0.3 dB = 0.6 dB

No of connector and MS= 2 x 0.5 dB= 1 dB

Fade margin= 3 dB

Splitter loss= 21.7 dB

Optical path loss= 0.5 dB per km with FS

7 km path loss = 3.5 dB

Total loss= 0.2+0.6+1+3+21.7+3.5= 30 dB

Class C+ optics= 32 dB link budget

1:32 split

Total loss 0.2+0.6+1+3+17.7+3.5=27 dB


3. LED Message


3. Port Info Power Phone LAN Port Optical connector TV WiFi


1. Accessories for individual Customer

ONT/ONU – 1 Drop Cable – 150 Meters (as per requirement) FAST Connector - 2


1. Process of Installation & Appearance Finalize the Distribution Port, remove port cap and place it in Holder. Take Value of Finalized DS Port. (value same = as per database) Insert & Manage Drop Cable in Splitter. (with screw & cable tie)


1.1 Process of Installation & Appearance Prepare FAST connector for Distribution Splitter. Manage Drop Cable Properly & join it in port serially.


1.2 Process of Installation & Appearance Pull wire in managed way to customer premises. Use cable Tie around the main pole and hang drop cable

with small tie with it. Never bend drop wire. Prepare for Fast Connector for Customer End.


THANK YOU

Download - Ftth overview training lumini net

Top Related