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communication plays a vital role in the economic growth
of any country. Keeping this in mind, Finolex is the pioneer
company in India to enter the Telecommunication field
by manufacturing polyethylene insulated Jelly Filled Telephone
Cables (PIJF). Over the years, Finolex has developed the
facilities to manufacture and test Jelly Filled Telephone
Cables conforming to international specifications and
standards of the U.S. (Bell and REA), Singapore and many
more countries.
Each conductor consists of a solid bare round wire of annealed high conductivity copper, smoothly drawn with uniform diameter and resistance. It is insulated with either solid medium/high density polyethylene or Foam Skin polyethylene insulation. The conductor is insulated uniformly in various colours with extremely tight tolerances to help the cable meet the electrical and transmission requirements of specification.
Individual insulated conductors are twisted together with a uniform lay to form a pair. The length of the lay of each pair is different from that of the adjacent pair to enable the cable to meet the capacitance unbalance, attenuation and cross talk requirements of the specifications. The pairs have specific colour combination for easy identification.
The
twisted pairs are stranded in a single unit of 10, 20
and 25 pairs and wrapped helical with an identification
colour binder. For higher pairage cable, a number of
units are stranded together to form a super unit. A
coloured identification binder is wrapped around the
super units for easy identification.
These units or super units are then laid up to form the core of the cable. During this operation a water-resistant filling compound is introduced to fully fill the interstices of the laid up core. This filling compound acts as a dielectric between the layers and the moisture barrier. The Jelly Filled laid up Cable is then covered with a layer of non-hygroscope polyester tape to pack the jelly. This also acts as a mechanical protection to the cable core, and acts as a dielectric.
An aluminium tape coated on both sides with polyethylene is applied longitudinally over the core wrap with overlap. These help in preventing electrical interference induced by other Power Cables laid in parallel. It also acts as a moisture barrier. A tight-fitting sheath of black virgin polyethylene is then extruded over the Aluminium Polylaminated Screen, which offers protection to the cable. A double polyethylene tape is applied helical over the inner sheath with a suitable overlap. This acts as bedding for the steel tape. The cable is then helical armoured with double galvanised steel tapes with a suitable overlap. This offers mechanical protection to the cable.
A double polyethylene tape is applied helical over the
inner sheath with a suitable overlap. This acts as bedding
for the steel tape. The cable is then helical armoured
with double galvanised steel tapes with a suitable overlap.
This offers mechanical protection to the cable.
A tight-fitting jacket of specially formulated black
virgin polyethylene is extruded over the armoured cable.
This acts as a mechanical protection and protection
against ultra-violet rays.
The Company's name, cable size, year of manufacture
and the telephone handset emblem is put on the outer
jacket for identification. There is also a number marking
printed on the cable progressing sequentially at every
one-meter.
Each cable drum is tested on a computer-controlled automatic
testing bridge, for the electrical and transmission
parameters, before the cable is offered to the customer.
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