Telephone Cables

 Indoor Central Office Cables to CW 1308

Application

The cables are designed to handle low frequency signals for short range applications, suitable for internal connection of telephone systems and other communications equipment. Also, they are designed to be terminated in insulation displacement connectors (IDC).Insulated and sheathed in PVC or LSZH, these cables offer an extremely cost effective general signal cable for fixed installation.

Standards

• CW 1308

Construction

Telephone Cables

Telephone Cables

Conductors
Solid annealed copper sized 0.4/0.5mm as per class 1 of BS 6360/IEC 60228

Insulation
Colour coded PVC TI 54/LSZH for copper conductor & PVC TI 54/LSZH for the 1.38mm earth conductor

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

Cabling Element
Pairs or triples

Cable Core Assembly
There are two modes of construction: layer construction and unit construction. For layer construction, cables are laid up in concentric layers to form a compact and circular cable. Layer construction is for general use, including two cables for installation in customer’s premises where a good appearance is required. For Unit construction, the elements shall be pairs and laid up as units or sub-units. This include unit of 20 pairs which contain an insulated earth conductor of 1.38mm, for use with customer distribution schemes; unit of 16 pairs for use with the binary number system and unit of 30 pairs for use with Pulse Code Modulation (PCM) systems.

Core Wrapping
Cable containing more than 6 pairs have a polyester tape applied over the cable core prior to sheathing

Screen (optional)
A 24μ aluminium polyester foil shield can be provided for fully enclosing the core with an overlap

Sheath
PVC TM51 grade or LSZH compound. Grey, White, Cream or Black colours are standard

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

Drain Wire (optional)
For screened cables, a solid tinned 0.5mm copper drain wire may be longitudinally laid to ensure electrical continuity of the screen

Electrical & Mechanical Properties

Nominal Conductor Diameter

mm

0.4

0.5

1.38

Conductor Size

mm2

0.126

0.196

1.495

Maximum Conductor Resistance @20°C

Ω/km

153

97.8

12.4

Minimum Insulation Resistance 500V DC @20°C

MΩ.km

50

50

N/A

Maximum Capacitance Unbalance @0.8KHz-3.0KHz pair-to-pair pF/500m 200(Unit)/300(Layer) 500 N/A

Minimum Insulation Thickness

mm

0.15 0.15

0.55

Maximum Insulated Conductor Diameter

mm

0.85 0.95

3.5

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: 7.5 x Overall Diameter

Color Code

Make Up & Unit Identification Colours – 16 Pair Unit

Pair Size 8 Pairs 16 Pairs 32 Pairs 64 Pairs 128 Pairs 256 Pairs
Number of Units
Centre
1st Layer
2nd Layer
½ 1 4 X ½ 1 4 X ½ 1
6 X ½ 6 5
          10
Unit No. Colours of Unit Lappings
1 ORANGE ORANGE ORANGE ORANGE ORANGE ORANGE

2

GREEN

ORANGE

GREEN

ORANGE

3

 

NATURAL

ORANGE

NATURAL

4

 

GREEN

NATURAL

NATURAL

5

 

 

NATURAL

NATURAL

6

 

 

NATURAL

GREEN

7

 

 

NATURAL

ORANGE

7

 

 

GREEN

NATURAL

9-15

 

 

 

NATURAL

16

 

 

 

GREEN

Note: ½ refers to sub-units of 8 Pairs.

Make Up & Unit Identification Colours – 20 Pair Unit

Pair Size 10 Pairs 20 Pairs 40 Pairs 50 Pairs 80 Pairs 100 Pairs 160 Pairs 320 Pairs
Number of Units
Centre
1st Layer
2nd Layer
½ 1 4 X ½ 5 X ½ 1 1 4 X ½ 1
        6 X ½ 8 X ½ 6 5
          **   10
Unit No. Colours of Unit Lappings

1

ORANGE

ORANGE

ORANGE

ORANGE

ORANGE

ORANGE

ORANGE

ORANGE

2

 

 

GREEN

NATURAL

ORANGE

ORANGE

GREEN

ORANGE

3

 

 

 

GREEN*

NATURAL

NATURAL

ORANGE

NATURAL

4

 

 

 

 

GREEN

NATURAL

NATURAL

NATURAL

5

 

 

 

 

 

GREEN

NATURAL

NATURAL

6

 

 

 

 

 

 

NATURAL

GREEN

7

 

 

 

 

 

 

NATURAL

ORANGE

7

 

 

 

 

 

 

GREEN

NATURAL

9-15

 

 

 

 

 

 

 

NATURAL

16

 

 

 

 

 

 

 

GREEN

Note 1: ½ refers to sub-units of 10 Pairs.
Note 2: These cables include the single 1.38mm diameter insulated conductor.
* The Green colour lapping shall be applied to the last ½ unit.
** At the manufacturer’s discretion the first layer may be 4 x 1.
Alternatively the centre layer may be 5 x 1 in which case the unit lappings shall be coloured Orange,3 x 1 Natural, Green.

Make Up & Unit Identification Colours – 30 Pair Unit

Pair Size 30 Pairs 120 Pairs 150 Pairs
Number of Units
Centre
1st Layer
1 1 1
  6 X ½ 8 X ½
Unit No. Colours of Unit Lappings

1

ORANGE

ORANGE

ORANGE

2

 

ORANGE

ORANGE

3

 

NATURAL

NATURAL

4

 

GREEN

BLUE

5

 

 

GREEN

Note 1: ½ refers to sub-units of 15 Pairs.

Colour Scheme for Pairs & Triples

Cabling
Element
No.
a-wire b-wire Cabling
Element
No.
a-wire b-wire Cabling
Element
No.
a-wire b-wire
1 WHITE Blue BLUE White 11 BLACK Blue BLUE Black 21 VIOLET Blue BLUE Violet
2 WHITE Orange ORANGE White 12 BLACK Orange ORANGE Black 22 VIOLET Orange ORANGE Violet
3 WHITE

Green

GREEN

White 13 BLACK Green GREEN Black 23 VIOLET Green GREEN Violet
4 WHITE

Brown

BROWN

White 14 BLACK Brown BROWN  Black 24 VIOLET Brown BROWN  Violet
5 WHITE

Grey

GREY

White 15 BLACK Grey GREY  Black 25 VIOLET Grey GREY  Violet
6 RED Blue BLUE Red 16 YELLOW Blue BLUE Yellow 26 PINK Blue BLUE Pink
7 RED Orange ORANGE Red 17 YELLOW Orange ORANGE Yellow 27 PINK Orange ORANGE Pink

8

RED

Green

GREEN

Red

18

YELLOW

Green GREEN

Yellow

28

PINK

Green

GREEN

Pink

9

RED

Brown

BROWN

Red

19

YELLOW

Brown BROWN 

Yellow

29

PINK

Brown

BROWN

Pink

10

RED

Grey

GREY

Red

20

YELLOW

Grey GREY 

Yellow

30

PINK

Grey

GREY

Pink

In each triple, the c-wire shall be coloured TURQUOISE

Dimensions And Weight

Cable Code

Number
of
Pairs

Minimum Insulation
Thickness
mm

Make Up

Minimum Sheath
Thickness
mm

Maximum Overall
Diameter
mm

Nominal
Weight
kg/km

0.4mm Conductor, 0.85mm Insulated Wire-Layer (Pair)

TP1308-YY-2P04

2

0.15

Layer

0.4

3.9

15

TP1308-YY-3P04

3

0.15

Layer

0.5

5.3

21

TP1308-YY-4P04

4

0.15

Layer

0.5

5.8

25

TP1308-YY-6P04

6

0.15

Layer

0.6

6.8

37

TP1308-YY-10P04

10

0.15

Layer

0.6

8.3

54

TP1308-YY-12P04

12

0.15

Layer

0.7

8.9

61

TP1308-YY-20P04

20

0.15

Layer

0.7

10.4

95

TP1308-YY-25P04

25

0.15

Layer

0.8

11.1

115

0.5mm Conductor, 0.95mm Insulated Wire-Layer (Pair)

TP1308-YY-3P05

3

0.15

Layer

0.65

5.0

25

TP1308-YY-4P05

4

0.15

Layer

0.65

5.8

30

TP1308-YY-6P05

6

0.15

Layer

0.6

6.8

40

TP1308-YY-10P05

10

0.15

Layer

0.6

8.3

50

TP1308-YY-12P05

12

0.15

Layer

0.7

9.1

75

TP1308-YY-15P05

15

0.15

Layer

0.7

9.8

98

TP1308-YY-20P05

20*

0.15

Layer

0.8

10.7

140

TP1308-YY-25P05

25

0.15

Layer

0.8

11.4

184

*This cable has an additional 0.5mm insulated conductor coloured VIOLET.

Cable Code Number
of
Triples
Minimum Insulation
Thickness
mm
Minimum Primary
Sheath Thickness
mm
Minimum Secondary
Sheath Thickness
mm
Maximum Overall
Diameter
mm
Nominal
Weight
kg/km
0.4mm Conductor, 0.85mm Insulated Wire-Layer (Triple)

TP1308-YY-1T04

1

0.15

0.4

3.8

17

TP1308-YY-5T04

5

0.15

0.4

0.8

13.0

45

0.5mm Conductor, 0.95mm Insulated Wire-Layer (Triple)

TP1308-YY-1T05

1

0.15

0.4

4.0

20

TP1308-YY-5T05

5

0.15

0.4

0.8

13.5

65


Cable Code Number
of
Pairs
Minimum Insulation
Thickness
mm
Size of Unit Minimum Sheath
Thickness
mm
Maximum Overall
Diameter
mm
Nominal
Weight
kg/km
0.4mm Conductor, 0.85mm Insulated Wire-Unit (Pair)

TP1308-YY-8P04

8

0.15

1/2*16

0.6

7.2

45

TP1308-YY-16P04

16

0.15

16

0.7

9.8

80

TP1308-YY-32P04

32

0.15

16

0.8

12.0

145

TP1308-YY-64P04

64

0.15

16

1.1

16.0

260

TP1308-YY-30P04

30

0.15

30

0.8

11.8

130

TP1308-YY-120P04

120

0.15

30

1.6

24.8

480

TP1308-YY-150P04

150

0.15

30

1.7

26.0

590

0.5mm Conductor, 0.95mm Insulated Wire-Unit (Pair)

TP1308-YY-8P05

8

0.15

1/2*16

0.6

7.6

65

TP1308-YY-16P05

16

0.15

16

0.7

10.2

115

TP1308-YY-32P05

32

0.15

16

0.8

12.4

205

TP1308-YY-64P05

64

0.15

16

1.1

16.5

390

TP1308-YY-128P05

128

0.15

16

1.6

25.4

785

TP1308-YY-256P05

256

0.15

16

2.0

35.2

1460

TP1308-YY-(10P+E)05

10+E

0.15

1/2*20

0.6

8.6

85

TP1308-YY-(20P+E)05

20+E

0.15

20

0.7

12.0

160

TP1308-YY-(40P+E)05

40+E

0.15

20

0.9

15.0

371

TP1308-YY-(50P+E)05

50+E

0.15

20

1.0

17.0

427

TP1308-YY-(80P+E)05

80+E

0.15

20

1.2

22.5

610

TP1308-YY-(100P+E)05

100+E

0.15

20

1.5

27.0

630

TP1308-YY-(160P+E)05

160+E

0.15

20

1.7

30.3

1059

TP1308-YY-(320P+E)05

320+E

0.15

20

2.2

39.5

2255

TP1308-YY-30P05

30

0.15

30

0.8

12.2

190

TP1308-YY-120P05

120

0.15

30

1.6

25.1

765

TP1308-YY-150P05

150

0.15

30

1.7

26.0

1100

Note: For those cables with BT designation suffixed E contain a 1.38mm diameter insulated earth conductor