PON design considerations for FTTH FTTx

1. EPON N t
Network
k
Design Considerations
By SUN Telecom
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2. Summarization
1.
2.
3.
3
4.
5.
6.
7.
8.
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Bandwidth Requirements
Splitting Architecture
Distance
Optical power budget to make sure the optical loss in
proper range
Services to provide
Update the existing network
Network Nodes
Cables

3. 1.B
1.Bandwidth Requirements
1.
2.
3.
4.
The number of subscribers.
Bandwidth for each subscriber.
Bandwidth Calculation:
Actual Average Bandwidth = Bandwidth for each User x
Network Concurrent Rate x Online Rate or Actual Total
Bandwidth = Bandwidth for each Subscriber x The
Number of Subscribers x Network Concurrent Rate x
Online Rate
5. According to the effective bandwidth of each PON
g
port(about 900M) calculate the number of PON cards.
6. Distribute different bandwidth for different users according
to the situation.
7. Reserve bandwidth for update if needed.

4. 2.S
2.Splitting Architecture
1.
1 The splitting architecture is depend on the distribution of
the users, and the need of service providing.
2. Decide 1-stage splitting or 2-stage splitting.
3. Consider average splitting or not. Generally in EPON
system PLC splitter will be used for equal optical power
division
di ision and FBT splitter for unequal optical po er di ision
neq al
power division.
The comparison as follows:

5. Splitting Architecture
Parameters
PLC Splitter
FBT Splitter
Wavelength Range (nm) 1260 ~ 1650nm
Single/dual/triple
window
Splitting Ratio
S litti R ti
Equal di i i
E
l division
Equal or non-equal
non equal
division
Dimensions
Small
Large size for multi
channel
Wavelength Sensitivity
Low
High
Cost
Low splitting channel
channel,
high price
Price is lower for small
channel splitter

6. Splitting Architecture
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4. For PLC splitter we have following splitting architectures:
p
g p
g
1. Distribution Splitting
2. Aggregation Splitting
3. Centralized Splitting

7. Cascading Splitting (1 x 8 / 1x 4 or 1x 4 / 1x 8)

8. Placement
POS Located in LCP and NAP
Features
F t
Multi-point testing and maintenance
High ti l loss
Hi h optical l
Low OLT PON port utilization rate
Complicated net ork str ct re hard to maintain
network structure,
Application
A i l access method
th d
Aerial
Network reform

9. Single Splitting (1 : 32)

10. Placement
LCP
Features
Integrated link testing and user management
Low Optical loss
p
High OLT PON port utilization rate
Low cost for splitter
Simple network topology, easy to maintain
Application
Duct access method
New Project

12. Placement
CO
Features
Single point link testing and maintain
Low Optical loss
High OLT PON port utilization rate
Low cost for splitter
Dedicated cable for each house
Flexible topology
Huge infrastructure cost
Application
pp
Duct access, new project, user close to CO

13. 1.
1 EPON can support a transmitting distance for about 20
km under 1:32 splitting ratio, and about 10 km under
1:64 splitting ratio.
2. The distance mainly depends on the optical loss. The
higher the optical loss is, the shorter the transmitting
distance will be
be.
3. If the transmitting distance of cable is more than 2 km,
fiber splicing should be taken into account.
4. For nodes in different distances we may use FBT
splitter to distribute more optical power for the further
node and less optical power for the nearer node thus
make sure all the nodes can get enough optical power.

14. 5.O
5.Optical power budget
1. EPON System
2. CATV System

15. Light Budget Calculation
Items
Unit
OLT
Mean Output Power MIN
dBm
Mean Output Power MAX
dBm
Min Sensitivity
Mi S
iti it
dBm
dB
Min Overload
dBm
ONU
Mean Output Power MIN
dBm
Mean Output Power MAX
dBm
Min Sensitivity
dBm
Min Overload
dBm
Optical Power
Max. Optical Power Consume
dB
Min Optical Power Consume
dB
Single Fiber (PX20)
2
7
-29
29
-10
-1
4
-25
25
-3
27
14

16. Power Loss Point Analysis
Name
Avg. Loss (dB)
Adapter
0.4
0.1
01
1:32
16.5
1:16
13.5
13 5
1:8
10.5
1:4
7.2
72
1:2
Splitter
Quick Connection Connector
Fusion Splicing
Connection
0.2
02
3.2
1310nm
0.36
0 36 /km
1490nm
0.25 /km
Cable (G. 652)

17. ODN Light Budgeting (Example)
Length of Fiber Cable
Wavelength of the Light
Quantity of Adapter
Q
f
Number of Quick Connection Connector
Splitter

18. 20km Optical Loss (1 Splitter)
Loss Type
Qty
Avg.
Loss
(dB)
1:64
1:32
1:16
1:8
1:4
1:2
Total Avg. Loss (dB)
Cable (G.652) (km)
20
0.36
7.2
7.2
7.2
7.2
7.2
7.2
Adapter (pc)
7
0.2
1.4
1.4
1.4
1.4
1.4
1.4
Quick Connection
Connector (pc)
1
0.4
0.4
0.4
0.4
0.4
0.4
0.4
Extra Loss
1
1
1
1
1
1
1
1
1;64
1
19.7
19.7
1:32
1
16.5
1:16
1
13.5
1:8
1
10.5
1:4
1
7.2
1:2
1
3.2
Passive
Optical
Splitter
(pc)
Total Loss (dB)
16.5
13.5
10.5
7.2
3.2
29.7
29 7
26.5
26 5
23.5
23 5
20.5
20 5
17.2
17 2
13.2
13 2

19. 10km Optical Loss (2 Splitters)
(2
Loss Type
Qty
Avg.
Loss
(dB)
1:64
1:32
1:16
1:8
1:4
1:2
Total Avg. Loss (dB)
Cable (G.652) (km)
10
0.36
3.6
3.6
3.6
3.6
3.6
3.6
Adapter (pc)
8*
0.2
1.6
1.6
1.6
1.6
1.6
1.6
Quick Connection
Connector (pc)
1
0.4
0.4
0.4
0.4
0.4
0.4
0.4
Extra Loss
1
1
1
1
1
1
1
1
1;64
1
19.7
1:32
1
16.5
1:16
1
13.5
1:8
1
10.5
1:4
1
7.2
1:2
1
3.2
Passive
Optical
Splitter
(pc)
Total Loss (dB)
16.5
13.5
10.5
7.2
3.2
3.2
3.2
3.2
6.4*
3.2
26.3
26 3
23.3
23 3
20.3
20 3
16.9
16 9
12.9
12 9
9.7
97

20. 1:64, 1:32 Optical Budgeting
20km
1:64
1:64
15km
1:32
29.5
1:32
1:64
10km
1:32
27.75
26.3
1:64
5km
1:32
26
24.55
1:64
1:32
24.25
22.8
21.05
Preserve
3
3
3
3
3
3
3
3
Total Loss
32.5
29.3
30.75
27.55
29
25.8
27.25
24.05

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1550nm
Transmitter: 17.5dBm
Receiver: -6 ~ 2dBm (
(-10 ~ 2dBm)
)
17.5dBm – 23.3dBm = - 5.8dBm

22. 5.S
5.Services to provide
1. EPON provides services such as data, IPTV/CATV and VoIP,
widely used in various applications like FTTH, FTTB, FTTC,
triple pla sec rit s stem video surveillance s stem
play, security system, ideo s r eillance system,
intelligent community, city hotspot (airport, station, etc.), WiFi access, and even TDM over EPON
access
EPON.
2. FTTH topology.
3. FTTB/C topology.
4. FTTO topology.
5. EPON surveillance topology.

23. FTTH topology
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24. FTTB/C Topology
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25. FTTO Topology
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26. EPON surveillance topology

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

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1.Deployment
1 Deployment and design requirement
①OLT
central office should be easy to handling large
equipment
②Enough space for device installation and storage
③Good working environment (Temperature & Humidity)
④Central Office construction standard
⑤CO with fire safety equipment
ith fi
f t
i
t
⑥The CO should be far away from high-intensity vibration
source, noise source, electromagnetic interference, and
flammable and explosive materials

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2.Power
2 Power supply requirement
①Provide
-48V power supply
48V
②Highest power load requirement that the area can have
③Individual power line access dedicated power
access,
distribution box
④UPS power supply

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3.Grounding
3 Grounding requirement
①AC/DC
Power supply grounding
②Section size of grounding wire should greater than
25mm2
③Ground resistance should be less than 5 ohm

32. User aggregation point
Located in place that is easy to manage and
maintain
i t i
Building distributor, weak current vertical shaft,
outdoor optical cross-connection cabinet, man
d
i l
i
bi
hole, pole etc
Active connection, easy to inspect and
maintain

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Close to subscriber
The terminal device can not too big
Floor vertical shaft, staircase, electrical pole
f
Distribution cable spliced with drop cable

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For FTTH application, dedicated box for install
application
ONU, embedded on the wall
Local power supply
L
l
l

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Feeder Fiber Cable
Feeder Cable for connection Cable from ODF in central
office and splitter distribution cabinet in LCP.
Direct burial duct, or aerial installation.
burial, duct
installation
Distribution Fiber Cable
For connection Splitter distribution point to fiber distribution point
point,
Indoor or outdoor application.
Drop Cable
The last-mile of the ODN, from fiber distribution point to user
terminal.
Direct burial duct, or aerial installation.
installation
burial, duct

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Thanks!
By SUN Telecom
http://www.suntelecom-cn.com/