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    Foam Skin Insulated & LAP Sheathed Jelly Filled Cables to RUS(REA) PE-89

    Application

    The cables are designed for use in access or trunk networks, from telephone exchange to subscriber area. The cables are suitable for installation in ducts, direct burial in the ground and also for aerial installation with integral suspension strand. Jelly filled option is for subscriber’s cables installed underground or along the edge of pavement. An armoured option is offered for direct burial installations where additional mechanical or rodent protection is required. A figure-8 self support option is offered for aerial installation.

    Standards

    • RUS(REA) PE-89 (RUS 7 CFR 1755.890)

    Construction

    Conductors

    Solid annealed bare copper, 0.4/0.5/0.63/0.9mm as per ASTM B-3/class1 of IEC 60028

    Insulation

    Foam Skin which is a composite polyethylene insulation made of an inner cellular layer and an outer solid skin as per ASTM D 1248/IEC 60708

    Twisted Pairs

    Insulated conductors are twisted into pairs with varying lay length to minimize crosstalk

    Cabling Element

    Twisted Pairs

    Cable Core Assembly

    Cables of 25 pairs or less are assembled into cylindrical core. Cables larger than 25 pairs are assembled into units, which are then used to form the core Units are identified by colour coded binders. Standard construction is per RUS(REA) PE-89 given in Cable Make Up Diagram

    Core Wrapping

    One or more non-hygroscopic polyester tapes are helically or longitudinally laid with an overlap. These tapes furnish thermal, mechanical as well as high dielectric protection between shielding and individual conductors

    Moisture Barrier

    A corrugated copolymer coated aluminium tape (0.2mm/8mil) is applied directly over the cable core to provide 100% electrical shielding coverage and ensure a barrier against water vapor

    Filling

    The cable core interstices are filled with petroleum jelly to avoid longitudinal water penetration within the cable.The water resistant filling compound is applied to the air space between non-hygroscopic tape and shield, shield and sheath within the cable core

    Sheath

    Black low density polyethylene as per ASTM D 1248/IEC 60708, being able to withstand exposure to sunlight,temperature variations, ground chemicals and other environmental contaminants

    Ripcord(optional)

    Ripcord may be provided for slitting the sheath longitudinally to facilitate its removal

    Spare Pairs (optional)

    Spare pairs may be incorporated for large pair cables

    Continuity Wire (optional)

    One tinned copper drain wire may be longitudinally laid to ensure electrical continuity of the screen

    Optional Construction

    Armoured Cable
    Corrugated copolymer coated steel tape armour (0.15mm/6mil) is applied with an overlap over an optional inner polyethylene sheath. An outer polyethylene sheath is applied over the armour

    Self-Support Cables

    A 7-strand galvanized steel strand is used as support wire. Black polyethylene sheath covers both core and support wire in a figure-8 construction

    Electrical Properties

    Nominal Conductor Diameter

    mm

    0.4

    0.5

    0.63

    0.9

    Conductor Gauge Size

    AWG

    26

    24 22

    19

    Maximum Average DC Resistance

    Ω/km / Ω/mile

    140/225

    87/140 55/88.6

    27.0/43.4

    Maximum Individual DC Resistance

    Ω/km / Ω/mile

    144.2/232

    89.5/144 56.5/91.0

    28.0/45.0

    Minimum Insulation Resistance @500V DC

    MΩ.km / MΩ.mile

    1600/1000

    1600/1000 1600/1000

    1600/1000

    Maximum Average Resistance Unbalance

    %

    1.5

    1.5 1.5

    1.5

    Maximum Individual Resistance Unbalance

    %

    5

    5 5

    5

    Average Mutual Capacitance

    nF/km / nF/kft

    48.5-54.0
    /14.8-16.5

    48.5-54.0
    /14.8-16.5
    48.5-54.0
    /14.8-16.5

    48.5-54.0
    /14.8-16.5

    Maximum Individual Mutual Capacitance

    nF/km / nF/kft

    57/17.4

    57/17.4 57/17.4

    57/17.4

    Maximum Individual Capacitance Unbalance pair-to-pair

    pF/km / pF/kft

    145/44

    145/44 145/44

    145/44

    Capacitance Unbalance RMS pair-to-pair

    pF/km / pF/kft

    45/13.7

    45/13.7 45/13.7

    45/13.7

    Maximum Individual Capacitance Unbalance 
    pair-to-ground

    pF/km / pF/kft

    2625/800

    2625/800 2625/800

    2625/800

    Maximum Average Capacitance Unbalance pair-to-ground

    pF/km / pF/kft

    574/175

    574/175 574/175

    574/175

    Maximum Conductor Loop Resistance @20°C

    Ω/km / Ω/mile

    300/482

    192/309 114/183.6

    60/96.4

    Impedance @1KHz

    994

    796 660

    445

    Impedance @100KHz

    147

    134 125

    122

    Impedance @512KHz

    120

    118 117

    116

    Impedance @1MHz

    117

    115 114

    113

    Maximum Average Attenuation @0.8KHz

    dB/km / dB/kft

    1.64/0.5

    1.30/0.39 1.04/0.32

    0.74/0.22

    Maximum Average Attenuation @1KHz

    dB/km / dB/kft

    1.68/0.51

    1.35/0.41 1.08/0.33

    0.76/0.23

    Maximum Average Attenuation @3KHz

    dB/km / dB/kft

    3.18/0.97

    2.52/0.77 2.01/0.61

    1.42/0.43

    Maximum AverageAttenuation @150KHz

    dB/km / dB/kft

    11.4/3.47

    8.3/2.53 6.2/1.89

    4.4/1.34

    Maximum Average Attenuation @772KHz

    dB/km / dB/kft

    24.3/7.4

    19.4/5.9 15.4/4.7

    10.8/3.3

    Maximum Average Attenuation @1000KHz

    dB/km / dB/kft

    27.1/8.25

    21.4/6.52 17.5/5.33

    12.8/3.89

    Dielectric Strength

     

     

         

    Conductor to Conductor (3secs)

    V DC

    2400

    3000 4000

    5000

    Conductor to Screen (3secs)

    V DC

    10000

    10000 10000

    10000

    Minimum EL Far-end Cross-talk-Mean Power Sum          

               @150KHz

    dB/305m / dB/kft

    61

    63

    63

    65

               @772KHz

    dB/305m / dB/kft

    47

    49

    49

    57

               @1.6MHz

    dB/305m / dB/kft

    41

    42

    43

    44

               @3.15MHz

    dB/305m / dB/kft

    35

    37

    37

    39

               @6.3MHz

    dB/305m / dB/kft

    29

    31

    31

    33

    Minimum Far-end Cross-talk-Worst Pair Power Sum          

               @150KHz

    dB/305m / dB/kft

    57

    57

    57

    59

               @772KHz

    dB/305m / dB/kft

    43

    43

    43

    45

               @1.6MHz

    dB/305m / dB/kft

    37

    37

    37

    39

               @3.15MHz

    dB/305m / dB/kft

    31

    31

    31

    33

               @6.3MHz

    dB/305m / dB/kft

    25

    25

    25

    27

    Minimum Near-end Cross-talk-Mean Power Sum          

               @150KHz

    dB/305m / dB/kft

    58

    58

    58

    58

               @772KHz

    dB/305m / dB/kft

    47

    47

    47

    47

               @1.6MHz

    dB/305m / dB/kft

    43

    43

    43

    43

               @3.15MHz

    dB/305m / dB/kft

    38

    38

    38

    38

               @6.3MHz

    dB/305m / dB/kft

    34

    34

    34

    34

    Minimum Near-end Cross-talk-Worst Pair Power Sum          

               @150KHz

    dB/305m / dB/kft

    53

    53

    53

    53

               @772KHz

    dB/305m / dB/kft

    42

    42

    42

    42

               @1.6MHz

    dB/305m / dB/kft

    38

    38

    38

    38

               @3.15MHz

    dB/305m / dB/kft

    33

    33

    33

    33

               @6.3MHz

    dB/305m / dB/kft

    29

    29

    29

    29

    Nominal Insulation Thickness

    mm

    0.175

    0.2

    0.26

    0.3

    Nominal Insulated Conductor Diameter

    mm

    0.75

    0.9

    1.15

    1.5

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