1.solid annealed copper conductor 2.HDPE insulation 3.Jelly filled 4.PE sheath 5.Galvanized steel wire

aerial telephone cable,underground telephone cable,telephone cable

Application of aerial underground telephone cable :

a. Aerial Outdoor telephone cable hangs between pillars, used for connection from local telephone exchange or subcriber central to connection boxes used indoor and outdoor by installed on the wall or fixed on electric pole

b.Underground outdoor telephone cables is directly buried under ground or threaded pipes which connect cable tunnels together. This cable is used for connection from local telephone exchange or subcriber to connection boxes used indoor and out door bu installed on the wall or fixed on electric pole.

Construction of  aerial underground telephone cable:

1.solid annealed copper conductor

2.HDPE insulation

3.Jelly filled, Auminum tape armored or steel tape armored

4.PE sheath

5.Galvanized steel wire or without

Specification of  aerial underground telephone cable:

Pairs No. from 4 to 400

Conductor diameter from 0.4mm to 0.9mm

Some Technical data of  aerial underground telephone cable:

a.Conductor resistance at 20°C

   139Ω/km(0.4mm conductor)

   88.7Ω,/km(0.5mm conductor)

   52.5Ω/km(0.65mm conductor)

   27.4Ω/km(0.9mm conductor)

b.Unbalance resistor at 20°C

    2.0%(0.4mm conductor)

    1.5%(0.5mm  condcutor)

    1.5%(0.65mm conductor)

    1.5%(0.9mm conductor)

c.Transmission attenuation at 20°C  when at 1KHz

   1.85±3%dB/km(0.4mm conductor)

   1.44±3%dB/km(0.5mm conductor)

   1.13±3%dB/km(0.65mm conductor)

   0.82± 3%dB/km(0.9mm conductor)

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