A presentation to get the in-sight of the fiber calculation for FTTX deployment in a simple and clear approach

1. GK2345@GMAIL.COM
Formula for FTTX – GPON
Fiber count calculation
1
Engineers make the world

2. 2
• Understanding FTTX end to end connection
• Illustration of different type of customer
requirement
• A. Residential - GPON
• B. Commercial - GPON
• C. Un-split and partial split
• Cable count planning equation
Agenda

3. 3
FTTX / GPON overview
Gigabyte Passive Optical Network
OLT ONU
Optical Line Terminal
Optical Network Unit
Passive Optical Splitter
ONT
ONT
Joint Closure
1:32 SPL
Optical Network Terminal
ONT
1:2 SPL ONT
Un-SPlit
USP
Partial Split

4. 4
 OLT – Optical Line Terminal – Central Office equipment.
 ONT – Optical Network Terminal for individual customer
premises.
 ONU – Optical Network Unit – for cluster of customers served
by copper as the last mile.
 USP – Un Split / Partial split.
Legend
GPON - Calculation
 Assume 1:32 split ratio
 To achieve 100 Mbps per customer, only 25 customer are
connected per PON
 For 1 PON download speed 2.5 Gbps = 2500 Mbps
 For 1 Customer download speed = 2500 Mbps / 25 = 100
Mbps

5. 5
Case study
M
T
R
M
T
R
Residential Customer
Commercial Customer1 2
 For residential customer 100 Mbps is the
maximum available bandwidth.
 For commercial customer the requirement
granularity cannot be decided during the
survey stage as every commercial
customer will have specific requirement.
 To have clear understanding and to serve
1:X GPON and UnSPlit GPON, we have to
understand the customer requirement in
IT, telecom, application and capacity level.
 To plan and address the general
requirement, we have to assume every
individual customer is connected or ready
to connect via patch cord installation
during provisioning.

6. 6
GPON capacity Engineering
Central Office MTR FTBOSP IBC
OSP ODF OSP ODF
1:2
1:4
GPON Port
P2P Port
1:16
1:8
1:32
IBC ODF
Building where there is
only 8 customers available

7. 7
GPON capacity Engineering
Central Office MTR FTBOSP IBC
OSP ODF OSP ODF
1:2
1:4
GPON Port
P2P Port
1:16
1:8
1:32
IBC ODF
Building where there is
only 16 customers
available

8. 8
GPON capacity Engineering
Central Office MTR FTBOSP IBC
OSP ODF OSP ODF
1:2
1:4
GPON Port
P2P Port
1:16
1:8
1:32
IBC ODF
Building where there is
only 32 customers
available

9. 9
GPON capacity Engineering
Central Office MTR
FTB
OSP IBC
OSP ODF OSP ODF
1:2
1:4
GPON Port
P2P Port
1:16
1:8
1:32
IBC ODF
Building where there is any
integral number of
customer for GPON
connection.
Divide by 32 to get the
number of 1:32 splitters
The remaining GPON
connection to be
distributed among 1:16
and 1:8 splitter
accordingly.
For the expansion in the
building side GPON
connection, required
splitter combination to be
equipped in CO and MTR.

10. 10
GPON capacity Engineering
Central Office MTR FTBOSP IBC
OSP ODF OSP ODF
1:2
1:4
GPON Port
P2P Port
1:16
1:8
1:32
IBC ODF
Commercial customer who
want 2 Gbps download
speed

11. 11
GPON capacity Engineering
Central Office MTR FTBOSP IBC
OSP ODF OSP ODF
1:2
1:4
GPON Port
P2P Port
1:16
1:8
1:32
IBC ODF
Commercial customer who
want 1 Gbps download
speed

12. 12
GPON capacity Engineering
Central Office MTR FTBOSP IBC
OSP ODF OSP ODF
1:2
1:4
GPON Port
P2P Port
1:16
1:8
1:32
IBC ODF
Commercial customer who
want 500 Mbps download
speed

13. 13
 Number of living units (individual customer)
who will be identified with single invoice for all
telecom service from the service provider
point of view has to be confirmed.
 The classification of the above data as shown
in table under “Number of living units:” and the
business model with marketing strategy has to
confirm the FACTOR for various commercial
and split ratio requirement.
 The fiber has to land in each living units
(individual customer) and the flexibility to
connected in different configuration as shown
in the illustration.
 The number of fiber required to enter a MTR
can be calculated with cable count planning
equation.
Cable count planning Equation

14. 14
GK2345@GMAIL.COM