Telephone Cables

 PE Insulated ISDN Basic Access Air Core Cables

Application

The cables are used as basic access for ISDN services in central office wiring and cabling for ISDN basic access installation.

Standards

• ER.f5.058

Construction

Telephone Cables

Telephone Cables

Conductors
Solid annealed bare copper sized 0.5/0.6mm as per ASTM B-3/IEC 60228 class 1

Insulation
Solid polyethylene as per ASTM D 1248/IEC 60708

Twisted Pairs
Insulated conductors are twisted into pairs with varying lays to minimize crosstalk

Cable Core Assembly
The pairs are cabled together in layers of 12, 13 & 25 pair unit to form the cable 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

Sheath
PVC/LSZH

Ripcord (optional)
Nylon ripcord may be placed parallel to the cores to facilitate sheath removal

Electrical Properties

Nominal Conductor Diameter

mm

0.5

0.6

Conductor Gauge Size

AWG

24

-

Conductor Size

mm2

0.196

0.283

Maximum Conductor Resistance @20°C

Ω/km

91

63

Minimum Insulation Resistance @500V DC

MΩ.km

16000

16000

Maximum Resistance Unbalance

%

2.5

2.5

Average Mutual Capacitance

nF/km

52

52

Maximum Capacitance Unbalance @1KHz pair-to-pair

pF/km

260

260

Maximum Capacitance Unbalance @1KHz pair-to-ground

pF/km

2625

2625

Maximum Average Attenuation @20KHz

dB/km

4.9

3.9

Maximum Average Attenuation @40KHz

dB/km

6.2

4.8

Maximum Average Attenuation @60KHz

dB/km

7.0

5.6

Maximum Average Attenuation @80KHz

dB/km

7.7

6.0

Maximum Average Attenuation @100KHz

dB/km

7.9

6.3

Minimum ELFEXT pair-to-pair @20KHz

dB

56

56

Minimum ELFEXT pair-to-pair @40KHz

dB

52

52

Minimum ELFEXT pair-to-pair @60KHz

dB

50

50

Minimum ELFEXT pair-to-pair @80KHz

dB

49

49

Minimum ELFEXT pair-to-pair @100KHz

dB

48

48

Minimum NEXT pair-to-pair @20KHz

dB

61

61

Minimum NEXT pair-to-pair @40KHz

dB

57

57

Minimum NEXT pair-to-pair @60KHz

dB

55

55

Minimum NEXT pair-to-pair @80KHz

dB

54

54

Minimum NEXT pair-to-pair @100KHz

dB

51

51

Dielectric Strength Conductor to Conductor 3secs

V DC

3600

3600

Nominal Insulation Thickness

mm

0.2

0.25

Nominal Insulated Conductor Diameter

mm

0.9

1.1

Mechanical and Thermal Properties

Temperature range during operation (fixed state): -30°C – +70°C
Temperature range during installation (mobile state): -20°C – +50°C
Minimum bending radius: 15 x Overall Diameter

Colour Code

Standard colour code is per BT CW 110J given in Colour Code Chart.

Dimensions And Weight

Cable Code

Number of Pairs

Nominal Sheath Thickness
mm

Nominal Overall Diameter
mm

Nominal Weight kg/km

0.5mm Conductor, 0.9mm Insulated Wire
TP58-2Y(St)Y2P05-ISDN-B 2 0.8 4.5 23.0
TP58-2Y(St)Y4P05-ISDN-B 4 0.8 5.0 33.5
0.6mm Conductor, 1.1mm Insulated Wire
TP58-2Y(St)Y2P06-ISDN-B 2 1.0 5.5 30.0
TP58-2Y(St)Y4P06-ISDN-B 4 1.0 6.0 45.0