Connection:

The TELL port of the first separator is connected to the outdoor line.

The p port of the first separator is connected to the TELL port of the second separator.

The ADSL port of the first splitter is connected to cat or left blank.

The p port of the second splitter is connected to the telephone.

The ADSL port of the second splitter is connected to cat or left blank.

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If your phone has an extension interface, you only need a separator, the second phone connects to the extension of the first phone, and so on.