Telephone Cables
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Ordering Information

 Cellular PE Insulated & PE Sheathed Jelly Filled Cables to CW1128 & CW 1128/1179

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 construction is for subscriber’s cables installed underground or along the edge of

pavement. An armoured option is offered for direct burial installations. A figure-8 self support option is offered

for aerial installation.

Standards

CW 1128 (Unscreened jelly filled cables)

CW 1128/1179 (Screened jelly filled cables)

CW 1128/1252 (Self supporting jelly filled cables)

CW 1128/1198 (Steel wire armoured jelly filled cables)

CW 1128/1179/1198 (Steel wire armoured screened jelly filled cables)

Construction

CW1128 & CW 1128/1179CW1128 & CW 1128/1179

Conductors

Solid annealed bare copper 0.4/0.5/0.6/0.63/0.9 mm as per class 1 of BS 6360/IEC 60228

Insulation

Cellular polyethylene as per BS 6234/BS EN 50290-2-23/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 are composed of 10-pair units. Any extra pairs form a separate unit. Units are identified by colour coded

binders. Standard construction is per CW 1128 given in Cable Make Up Chart below

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(optional)

Laminated sheath made of an aluminium tape (0.15mm) coated with PE-copolymer on one or both sides is

applied longitudinally with overlap over the cable core to provide 100% electrical shielding coverage and

ensures a barrier against water vapor

Inner Bedding (for armoured cables)

Black polyethylene compound

Armour (for armoured cables)

Galvanized steel wire armour is applied over an inner polyethylene sheath

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 BS 6234/IEC 60708/ASTM D 1248 which is compounded 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

Continuity Wire (optional)

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

CW1128 & CW 1128/1179CW1128 & CW 1128/1179

Electrical Properties

Nominal Conductor Diameter mm 0.4 0.5 0.6 0.63 0.9
Conductor Gauge Size AWG 26 24 - 22 19
Conductor Size mm2 0.126 0.196 0.283 0.312 0.636
Maximum Average Conductor Resistance @20°C Ω/km 143 91 63 58 28
Minimum Insulation Resistance @500V DC MΩ.km 1500 1500 1500 1500 1500
Maximum Average Mutual Capacitance @800Hz* nF/km 56 56 42 56 59
Maximum Individual Mutual Capacitance @800Hz
(for 99% cases) 		nF/km 64 64 46 64 65
Maximum Individual Capacitance Unbalance @800Hz
pair-to-pair		 pF/500m 275 275 275 275 275
Maximum Conductor Loop Resistance @20°C Ω/km 300 192 130 114 60
Impedance @1KHz Ω 994 796 665 660 445
Impedance @100KHz Ω 147 134 127 125 122
Impedance @512KHz Ω 120 118 117.5 117 116
Impedance @1MHz Ω 117 115 114.5 114 113
Maximum Average Attenuation @0.8KHz dB/km 1.64 1.30 1.1 1.04 0.74
Maximum Average Attenuation @1KHz dB/km 1.68 1.35 1.14 1.08 0.76
Maximum Average Attenuation @3KHz dB/km 3.18 2.52 2.3 2.01 1.42
Maximum Average Attenuation @150KHz dB/km 11.4 8.3 7.2 6.2 4.4
Maximum Average Attenuation @772KHz dB/km 24.3 19.4 17.4 15.4 10.8
Maximum Average Attenuation @1000KHz dB/km 27.1 21.4 18.5 17.5 12.8
Dielectric Strength Conductor to Conductor (3secs) V DC 500 500 500 500 500
Nominal Insulation Thickness mm 0.175 0.20 0.375 0.26 0.30
Nominal Insulated Conductor Diameter mm 0.75 0.90 1.35 1.15 1.50

Remarks: For screened cables of 20 pairs or less the maximum average mutual capacitance values shall not apply and the
maximum for 99% shall be increased by 3nF.

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: 10 x Overall Diameter (unarmoured cables);15 x Overall Diameter (armoured cables)

Colour Code
Standard colour code is per CW 1128 given in Colour Code Chart

Cabling Element No.

a-wire

b-wire

1

WHITE

BLUE

2
3
4
5
6

WHITE

ORANGE

WHITE

GREEN

WHITE

BROWN

WHITE

GREY

RED

BLUE

7

RED

ORANGE

8

RED

GREEN

9

RED

BROWN

10

RED

GREY

Unit Number Binder Colour
1 BLUE

2

ORANGE

3

GREEN

4

BROWN

5 GREY

6 WHITE
7 RED
8 BLACK
9 YELLOW
10 VIOLET

Cable Size

No. and Pair Size of Units in Centre and 1st Layer

Centre

1st Layer

2 pairs

1 X 2

 

5 pairs                    

 1 X 5

 
10 pairs  1 X 10

 
20 pairs   4 X 5

 
  2 X 10

 
50 pairs 5 X 10

 
  1 X 10 4 X 10

100 pairs 2 X 10 8 X 10

  3 X 10 7 X 10

  4 X 5 8 X 10

Note:
The two pair cable is manufactured as a quad, coloured Orange, Green, White, and Black in order of rotation

 

 

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