Project Management – Telecom

Optical Fiber Implementation (OFI) is Jemmax Telecom Division’s core business. OFI is a stand-alone service, meaning it can be purchased independent of full project management.

Jemmax works as a business partner enabling you to select the right level of support, from simple advice up to a turnkey service that allows you to concentrate on developing your core business.

We help you plan your optical network with quality and performance to meet your long-term business goals. Our extensive experience in optical network planning gained in the implementation of networks, coupled with advance planning tools, will assure you that your optical network has the necessary coverage, capacity, hierarchy and topology characteristics to suit your development plans.

The Optical Implementation service includes the supply of a corresponding level of project management necessary to ensure service quality and delivery commitment. Project management under this scenario is limited to scheduling and managing the day-to-day activities of the implementation teams, ensuring the delivery of services is defect free and in accordance with customer specification, the creation and submission of relevant site documents, and the timely submission of change orders and customer invoices.

Jemmax offers the following services:

Route Survey and design

The entire route is surveyed for laying of Optical Fiber Cables for the following inputs:

  • ROW Approval
  • Soil strata
  • Existing Underground utilities
  • Road / Rail / Bridge / River / Canal Crossings
  • BOQ Estimation
  • Any other criticalities

BOQ Estimation and approval from Customer

On the basis of survey details an estimated BOQ is prepared and submitted to get the approval from the Customer.

Trenching, ducting and backfilling

Excavation of Trenches Standard depth of trench will be as per specifications Outside the city limits trench will normally follow boundary of roadside land. However, where road side land is full of borrow pits or forestation, or when cable is to be laid along Culverts/bridges or cross-streams, trench may be made closer to road edge or in some cases, over embankment or shoulder of the road depending up on federal/state ministry rules and regulations.

Line up of trench would be such that HDPE duct(s) will be laid in straight line, both laterally as well as vertically, except at locations where it has to necessarily take a bend because of change in alignment or gradient of trench. where bends are necessitated.

Duct Laying
Ducts will be laid in a flat bottom trench, free from stones, and sharp edged debris. The duct would be placed in trench as straight as possible, however at bends for duct would be maintained as per advised specifications.

Ducts will be laid preferably using dispenser designed for it. We ensure that Duct laid is free from twist and collapsed portion of Ducts. Any such portion will be rectified before backfilling by using couplers.

Ends of ducts will always be closed with END PLUGS to avoid ingress of mud, water or dust.

We ensure HDPE ducts are clear of sand, dust or any other particles, which would cause obstruction cable blowing/pulling. Prior to aligning the ducts for jointing, each length of the HDPE ducts will be thoroughly cleaned to remove all sand, dust or any other debris that may clog, disturb or damage the optical fiber cable when it is pulled or blown at a later stage.

The ducts will be joined with couplers using duct cutter & other tools and will be tightened and secured properly. The duct joint will be practically airtight to ensure smooth cable blowing using cable blowing machines.

Laying of Gl and / or RCC pipes as additional protection for the HDPE ducts at rail / road crossings, built-up area/city limits, on culverts and bridges will be done as required. Chambering or concreting around RCC/ Gl pipes as additional protection on bridges, culverts and also on stretches wherever depth of excavation is less than specified will be done.

Reinstatement of excavated trench will be done with proper compaction wherever required.

Crowning When backfilling has been done up to ground level a hump of soil is made to cater for soil settlement. Entire excavated soil will be used for back filling. Crowning will be confined over width of trench only.

Duct Integrity Test

After backfilling ducts shall be tested for integrity (air tightness and kink-free shape). Air tightness test is done by pressurizing 2 km duct stretches at a time. One end of duct will be closed and compressed air at 5-6kg/cm2 is sent from the other end. At about 5kg/cm2 pressure the inlet of compressed air will be closed. Fall in pressure should not be more than 50{9e1ce3e8b025d4dc8f0d4dbf1bb41574fe956a839d01a68e690c7ba86ba7fedb} in 1(one) hour.

To check that duct has not collapsed or kinked a wooden cylindrical piece (shuttle) is blown into the duct with far end fitted with Flexible Wire grip/stocking. The wooden shuttle should pass through duct at far end with out any obstruction and within approx. 10 minutes or less.

Fiber Termination

All fibers of Obtical Fiber cables will be terminated on Fiber Management System (FMS) at each regenerator (REG) or ADM (add drop multiplexer) location.

Installation of FMS is done according to the manufacturer’s specification.

End to End testing can be carried out from the FMS to FMS using the connectors who are mounted on the FMS.

Fusion Splicing

Splicing is done using a good quality splicing machine. Splice loss per joint will be minimum and would not be more than 0.05 dB. In no case average splice loss per link will be more than 0.05 dB x No. of splices. At least 1 M to 2 M fiber would be stored in cable tray. Fiber would be neatly coiled without kinks. Minimum bending radius of 80mm would be ensured, Joint closure would be sealed properly before it is taken out of the controlled environment free from dust particles and air-conditioned splicing vehicle.

Cable Testing

The Cable will be tested before pulling/blowing to ensure continuity also to evaluate the losses if any.

Aerial Cabling At places where open trenching is not possible due to very arrow roads and due to delay in obtaining Row, this method will be adopted as a temporary solution.

Cable blowing machine (Cable jet or any other machine) would be deployed along with a good compressor.

Cable drum will be loaded on payoff stand & unwound from topside of the drum. Pay off stand would be placed properly so that it does not collapsed while dispensing OFC.

End to End Link Testing

Link Test is carried out on entire section terminated at both ends after completion of tasks to ensure the losses are within permissible limits on all fibers.

Final as-build drawing/documents

The as-build drawing/documents will have the following information:

  • Relative position of proposed OFC route with respect to existing cables.
  • Marking of Rocky, Submerged and Normal soil terrain.
  • Marking of Crossing locations and type of proposed crossing detail viz.HDD, Open cut, and Boring etc.
  • Marking of offset availability.
  • Geographical co-ordinates for all crossing HDPE duct coupling and OFC jointing locations.