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Solid PE insulated jelly filled underground telephone cables

Polyethylene insulated jelly filled telephone cables are widely used for primary and secondary underground distribution network. The cables having single jacket are used as duct cables up to 1200 pairs as primary network. Secondary cables are directly buried and may be Armored with additional jacket of a tough weather resistance LDPE compound.

The cables core are fully filled with Petroleum jelly having the same dielectric constant and fully compatible with the insulation and jacketing materials. The cable are manufactured with high-grade materials according to REA Specification PE-39 and PTCL Specifications or customers requirements.


CABLE CONSTRUCTION
CABLE CONSTRUCTION
CONDUCTOR Fully annealed high quality solid copper , the conductor sizes are 0.4, 0.5, 0.6 & 0.9 mm.
INSULATION Color High Molecular Weigh Solid High-Density Polyethylene.
COLOUR CODING Cables are fully color coded in accordance with PIC even count color code.
PAIRING Two colored insulated conductors are uniformly twisted together to form a pair. Varying lay length is designed to minimize the cross talk and capacitance unbalance.
STRANDING / CABLING Twisted pairs are assembled into unit of 10, 25, 50 or 100 pairs. When desired for lay-up reason, the units are divided into two or more sub-nits, which are bind with durably colored Polyethylene Tapes to form a compact and circular cable.
FILLING COMPOUND The water resistant filling compound is applied to fill the air spaces within the cable core
CORE COVERING A non-hygroscopic and dielectric Polyester Tape and Water Blocking Tape are applied helically having a suitable overlap.
FLOODING COMPOUND Sufficient flooding compound is applied between the core wrap and shield.
MOISTURE BARRIER INNER SHEATH An Aluminum Tape with Co-polymer coating is applied over the cable core and sheath with Black Polyethylene Compound.
ARMOUR(OPTIONAL) A Tin Coated Steel Corrugated Tape is applied longitudinally directly over the Inner Sheath with suitable flooding compound.
JACKET Black High Molecular Weight Low Density Polyethylene Compound.
IDENTIFICATION An identification Tape durable marked with the manufacture’s name, year of manufacturing and cable size, if required, is placed under the Core Covering Tape. Alternatively, these details may be printed on the outer jacket of cable with length marking.

 


25 Pairs Unit Identification





Physical Dimention
   


Electrical Characteristics
Conductor Core

0.4mm

0.5 mm

0.6 mm

Conductor Resistance at 20 C (m/km)

145 92 63

Mutual Capacitance at 1000 Hz (nF/km)

     

Maximum Individual

52+4 nf 52+4  nf 52+4  nf

Maximum Average

52+3 nf 52+3  nf 52+3  nf

Capacitance Unbalance (pF/300m)

     

Pair-Pair

     

Maximum Average

25pF 25 pF 25 pF

Maximum Individual

100pF 100 pF 100 pF

Pair-Ground

     

Maximum Average

175pF 175 pF 175 pF

Maximum Individual

800pF 800 pF 800 pF
Insulation Resistance at 500v DC (MS-km)

     

Minimum

5000 5000 MS 5000 MS

High Voltage Test

     

Conductor-Conductor

2.5kv 3.0 KV 3.6 KV

Conductor-shield

10kv 10 KV 10 KV

Cross Talk Coupling Lass at 150 Khz

     

Minimum

73dB 73dB 73 dB
Attenuation (dB/Km)      

1 KHz

1.88 1.5 1.25

150 KHz

11.2 8.4 6.8

772 KHz

21.0 16.5 13.9

1024 KHz

23.4 19.5 16.1

1500KHz

29.4 23.6 19.5