GK2345@GMAIL.COMFormula for FTTX – GPONFiber count calculation1Engineers make the world
2• Understanding FTTX end to end connection• Illustration of different type of customerrequirement• A. Residential - GPON• B. Commercial - GPON• C. Un-split and partial split• Cable count planning equationAgenda
4 OLT – Optical Line Terminal – Central Office equipment. ONT – Optical Network Terminal for individual customerpremises. ONU – Optical Network Unit – for cluster of customers servedby copper as the last mile. USP – Un Split / Partial split.LegendGPON - Calculation Assume 1:32 split ratio To achieve 100 Mbps per customer, only 25 customer areconnected per PON For 1 PON download speed 2.5 Gbps = 2500 Mbps For 1 Customer download speed = 2500 Mbps / 25 = 100Mbps
5Case studyMTRMTRResidential CustomerCommercial Customer1 2 For residential customer 100 Mbps is themaximum available bandwidth. For commercial customer the requirementgranularity cannot be decided during thesurvey stage as every commercialcustomer will have specific requirement. To have clear understanding and to serve1:X GPON and UnSPlit GPON, we have tounderstand the customer requirement inIT, telecom, application and capacity level. To plan and address the generalrequirement, we have to assume everyindividual customer is connected or readyto connect via patch cord installationduring provisioning.
6GPON capacity EngineeringCentral Office MTR FTBOSP IBCOSP ODF OSP ODF1:21:4GPON PortP2P Port1:161:81:32IBC ODFBuilding where there isonly 8 customers available
7GPON capacity EngineeringCentral Office MTR FTBOSP IBCOSP ODF OSP ODF1:21:4GPON PortP2P Port1:161:81:32IBC ODFBuilding where there isonly 16 customersavailable
8GPON capacity EngineeringCentral Office MTR FTBOSP IBCOSP ODF OSP ODF1:21:4GPON PortP2P Port1:161:81:32IBC ODFBuilding where there isonly 32 customersavailable
9GPON capacity EngineeringCentral Office MTRFTBOSP IBCOSP ODF OSP ODF1:21:4GPON PortP2P Port1:161:81:32IBC ODFBuilding where there is anyintegral number ofcustomer for GPONconnection.Divide by 32 to get thenumber of 1:32 splittersThe remaining GPONconnection to bedistributed among 1:16and 1:8 splitteraccordingly.For the expansion in thebuilding side GPONconnection, requiredsplitter combination to beequipped in CO and MTR.
13 Number of living units (individual customer)who will be identified with single invoice for alltelecom service from the service providerpoint of view has to be confirmed. The classification of the above data as shownin table under “Number of living units:” and thebusiness model with marketing strategy has toconfirm the FACTOR for various commercialand split ratio requirement. The fiber has to land in each living units(individual customer) and the flexibility toconnected in different configuration as shownin the illustration. The number of fiber required to enter a MTRcan be calculated with cable count planningequation.Cable count planning Equation