1. Copper clad steel
This kind of wire is hard, not suitable for external wire pulling, easy to break the core. But buried in the wall will still be usable. And can only be used at close range (for example, from the floor junction box to the user)
2. Copper clad aluminum
This kind of wire is soft and easy to break the core. It can be buried in a wall, or it can be pulled out of a wall. And can only be used at close range (for example, from the floor junction box to the user)
This line is soft and can be buried in a wall or pulled out of a wall. It can be used for long-distance transmission.
Of these, the only telephone lines that meet national standards are those that use all copper.
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