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Urban FTTH design with micro-ducts

 

An urban city engineering example with 383 homes in Saudi Arabia

Summary: In this project we engineered an FTTH network design and BOQ & BOM for a small city area. This project illustrates the advantages of optimization even in smaller scale projects and we discuss the pro’s and con’s of using micro-ducts in an FTTH network.

Keywords: FTTH, urban, 383 homes, Saudi Arabia, micro-ducts, GPON, 4 OF minimum cable size, Home=>DP=>Cabinet, optimization, Autocad Map3D, Google Earth, BOQ.

About this case study:

The network design and the related Bill of Quantities are automatically made with our optimization software using advanced optimization algorithms. The optimization makes approx. 1 million calculations per 100 homes to calculate: the manipulation point areas and central positions and to design the best network routes. By doing this considerable savings are made for material and installations costs. This also results in less digging and less expensive road crossings.

The micro-duct and blown cable system:
The network is based on direct-buried micro ducts. We planned 1x7/4mm micro-ducts from the street to the home and 6&12x7/4mm micro-ducts in the streets for the 4 OF drop-cables. For the distribution network we use 7x14/10mm micro-ducts.

Drop-cables:
Per building: a 4/12/36 OF cable (with 1 live OF per FTU).

In the DP:
Typical amount of FTU (subscribers) per DP is 24. Exceptions for larger blocks are possible. There are 1:32 splitters planned in the DP. Only the live fibers are spliced.

The case study results:

  • Autocad (Map3D) dwg designs with:
    • Optimized manipulation point positions.
    • Optimized cable routes (drop & distribution).
    • Optimized micro-duct routes.
  • NetProject: BOQ and BOM, all quantities and costs.

 


The usage of direct buried micro-ducts:

Disadvantages:

  • Cable blowing equipment is required.
  • Extra costs for material & installation of the micro-ducts.
  • Extra installation action / time.

 

Advantages:

  • Timing: installation of the micro-ducts can be done by other teams and at an earlier stage. The micro-ducts are connected all the way from the cabinet to each individual DP.
  • No need for extra hand-holes etc. Simple straight micro-duct connectors are sufficient.
  • No need for expensive ducting.
  • Fast & controlled installation: no pulling of the cable, cable abuse etc. Installation of a cable is a matter of blowing from the cabinet position all the way to the DP.
  • Less chance of cable damage / havoc: there is no need for cables on roll / cable drums above ground at night, during the installation period.
  • Spare micro-ducts for future expansion can be installed anywhere along the routes.
  • Less expensive cables required.

 


Remarks

For the duct installer:
Building or home identifiers can be shown in the drawing.

Duct plan with duct number & length can be showed in the drawing and/or as separate file.
Per building branch off the 7MM micro-duct color / number can be showed in the drawing.
Per FAT / DP off the 14MM micro-duct color / number can be showed in the drawing.

For the cable installer:
Building or home identifiers can be shown in the drawing.

Per building branch off the 7MM micro-duct color / number can be showed in the drawing.
Per FAT / DP off the 14MM micro-duct color / number can be showed in the drawing.

Cables can be automatically labeled within the system.
Splicing schematics can be made automatically as separate documents.


Saudi Arabia
Case location
A closer impression of the area.
With the NetOptimus software, the optimized DP locations and 4/12/36 OF drop-cables routes were created automatically.
Instant Google Earth view from NetOptimus. DP locations, drop-cables. FAT 17(24/6) = DP No.17 with 24 FTU in 6 buildings.
Autocad (Map3D): the tertiary micro-duct network for the drop-cables from DP=>home. In this case 15 DP were planned with an average of 26 FTU per DP. (383 FTU/15 DP)
Autocad (Map3D): the secondary network for the distribution-cables from Cabinet=>DP.
Autocad (Map3D): the secondary micro-duct network for the distribution cables.
Autocad (Map3D): different types of trenches.