Telephone Cables

 Solid PE Insulated & AP Sheathed (ALPETH) Air Core Cables to ICEA S-85-625


Application

The cables are designed for use as subscriber distribution cables and as connection between central offices. The cables are suitable for installation in ducts, direct burial in the ground and also for aerial installation with integral suspension strand. An armoured option is offered for direct burial installations. A figure-8 self support option is offered for aerial installation.

Standards

• ANSI/ICEA S-85-625

 

 

 

Construction

Conductors
Solid annealed bare copper, 0.4/0.5/0.63/0.9mm, as per ASTM B-3/class 1 of IEC 60228

Insulation
Solid medium or high density polyethylene 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

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 layer of corrugated bare aluminium tape (0.2mm/8mil) is applied longitudinally with overlap over the cable core to provide 100% electrical shielding coverage and ensure a barrier against water vapor

Sheath
Black low or medium 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
Ripcord may be provided for slitting the sheath longitudinally to facilitate its removal

Spare Pairs (optional)
Spare pairs may be provided 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
0.15mm thick corrugated steel tape armour 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

Shield Options
There are 8 different shield options which can be offered in this standard:1) 8 mil bare aluminium tape
2) 8 mil coated aluminium tape
3) 5 mil copper tape
4) 5 mil copper clad alloy steel tape
5) 5 mil copper clad stainless steel tape
6) 6 mil & 7 mil 194 copper alloy tape
7) 6 mil bare steel tape
8) 6 mil coated steel tape

 

 

 

 

Aabbreviations

LAP (CAP):Copolymer coated aluminium tape + PE sheath
LAPSP (CAPSP):
LAP sheath + steel tape armour + PE
AP (ALPETH): Bare aluminium tape + PE sheath
PAP: PE inner sheath + bare aluminium tape + PE sheath
PASP: PE inner sheath + bare aluminium tape + steel tape armour + PE outer sheath
ASP (STAPETH): Bare aluminium tape + PE inner sheath + steel tape armour + PE outer sheath
CACSP: Copolymer coated aluminum tape + copolymer coated steel tape armour + PE outer sheath
LAPSP: Copolymer coated aluminum tape + PE inner sheath + steel tape armour + PE outer sheath
FIGURE 8 LAP: Copolymer coated aluminum tape + PE outer sheath + self supporting

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

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 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

0.15

0.2

0.26

0.3

Nominal Insulated Conductor Diameter

mm

0.7

0.9

1.15

1.5

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