We have in house teams & expertise available to carry out optical fibre cable laying works
for both inter and intra city routes. The works are executed by any of following methods:-
Open cut method
Trenchless technology ( Horizontal directional drilling machine )
Aerial cable.
We plan, deploy and manage client's optical networks covering project management,
operational support, systems integration & Competence Solutions We help customers to plan
their optical network with quality and performance to meet their long-term business goals. In
the last five years, Dexterity has executed more than 1000 km of works in India in various
states. The company is also undertaking projects in South Africa for various Telecom
companies.
The company has their own equipment like HDD Machine, Air Compressor, Blowing
Machine, Splicing Machine & OTDR etc. along with required vehicles. We have executed
Optical Fibre Cable laying works for reputed companies like RELIANCE, HFCL, IDEA,
VODAFONE, BSNL, IOCL etc.
The Company undertakes all the activities involved in the execution of Fibre Cable laying
work like
The entire route is surveyed for laying of Optical Fiber Cables for the following inputs
RoW demarcation
Soil strata
Existing Underground utilities
Road / Rail / Bridge / River / Canal Crossings
BOQ Estimation
Any other criticalities.
On the basis of survey details an estimated BOQ is prepared and submitted to get the approval from the Customer.
A Single Line Diagram is made, to determine jurisdictions for the statutory permissions such
as
State Highways
Railway Department
Roads & Buildings Department
Municipal corporations
Irrigation department
National highway Authorities etc.
Cantonments
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.
Lineup 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. Minimum radius of two meters will be maintained,
where bends are necessitated.
After backfilling ducts shall be tested for integrity (air tightness and kink-free shape).by
pressurizing 500 meter to 1 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% 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 without any obstruction and within approx. 10 minutes or less.
The Cable will be tested before pulling/blowing to ensure continuity also to evaluate the
losses if any. Post drum testing the fibre cable is blown through compressor and blowing
machine by maintaining required specification as mentioned by the customer like blowing
speed, compressor pressure etc.etc. The special care is taken while blowing the cable by
stacking fibre in figure of 8 to avoid any damage to the fibre cable .
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.
Aerial Cabling At places where open trenching is not possible due to very narrow roads and
due to delay in obtaining Row, this method will be adopted as a temporary solution. Also by
using special cables (ADSS) this will be laid along the Transmission lines for longer
distances.
The distribution boxes will be positioned at every location where a main cable will be
distributed to sub - areas with lesser pair cables.
Distribution boxes are also supplied by us as per the customer specification .
Splicing is done using a good quality splicing machine. Splice loss per joint will be minimum
and would not be more than 0.07 dB. In no case average splice loss per link will be more than
0.06 dB x No. of splices. At least 0.6 M to 0.8 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 van.
The test result of each joint are stored and later tabulated to create fibre test & link test report
for customer .
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. If the losses are more than specified limits then all such losses are rectified by way of resplicing of joints & the whole link is once again tested for the losses once the losses are brought well within limit then link is offord to the customer for the acceptance testing .
After the acceptance testing by the customer , the route is physically checked by the customer
to see that all works are executed as per approved plans and there is not visible defective
workmanship on the route . If there any defective works , such defective works are rectified
and offered for inspection to the customers .
Once the customer is satisfied with the workmanship then the route is signed off and handed
over to the customer .
Some of the major projects executed by the company in the last 5 years are listed below:-
Optical Fibre Cable laying works in state of UPE, Kerala, Maharashtra through ZTE for
Reliance communications- of Punjab for Reliance Communications – 250 KMS
Optical Fibre Cable laying works in various cities of Punjab for Reliance Jio through V&A –
150 KMS
Optical Fibre cable laying works in UPE for Defense through HFCL- 85 KMS .
Optical Fibre cable laying work in the state of Haryana & Punjab for IOCL- 85 KMS .
Optical Fibre cable laying work is for Reliance Jio in Delhi/NCR -80 KMS.
Optical Fibre cable laying works in various cities of Punjab for Vodafone - 30 KMS.
Optical Fibre cable laying works in various cities of Punjab for IDEA -25 KMS.
Optical Fibre cable laying works in the state of Haryana & Punjab for Bharti Telephonic – 30
KMS.
Optical Fibre cable laying works in various cities of Punjab for IDEA -25 KMS.