Telephone Cables
Outdoor Telephone Cables Indoor Telephone Cables Indoor/Outdoor Telephone Cables Special Telephone Cables

Ordering Information

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

Telephone Cables

Telephone Cables

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

TwistedPairs

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

CablingElement

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

Telephone Cables

Telephone Cables

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 Ω 994 796 660 445
Impedance @100KHz Ω 147 134 125 122
Impedance @512KHz Ω 120 118 117 116
Impedance@1MHz Ω 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 Average Attenuation @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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