fttx fiber-count-planning-calculation
DESCRIPTION
A presentation to get the in-sight of the fiber calculation for FTTX deployment in a simple and clear approachTRANSCRIPT
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
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
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
Case study
MTR
MTR
Residential CustomerCommercial 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.
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GPON capacity EngineeringCentral 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
GPON capacity EngineeringCentral 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
GPON capacity EngineeringCentral 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
GPON capacity EngineeringCentral 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
GPON capacity EngineeringCentral 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
GPON capacity EngineeringCentral 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
GPON capacity EngineeringCentral 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
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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
