What's the difference between four-core and two-core telephone lines?

The number of cores in a telephone line indicates the number of wires inside the telephone line. The main differences between four-core telephone lines and two-core telephone lines include the following aspects:

1. Number of connecting devices: A four-core telephone line can connect two telephone devices at the same time, such as a telephone and a fax machine. A two-core telephone line can only be connected to one telephone device.

2. Function expansion: Four-core telephone lines can support additional function expansion, such as digital voice transmission and broadband Internet access. Dual-core telephone lines are mainly used for traditional telephone communication.

3. Signal transmission quality: Because there are many wires in the four-core telephone line, it can usually provide better signal transmission quality and anti-interference ability.

It should be noted that the specific uses and standards of telephone lines may vary according to regions and types of communication equipment. Therefore, it may be necessary to further understand the relevant specifications and requirements in specific application scenarios in order to choose a suitable telephone line.