Refers to the line port and equipment port, which is known only to the speaker. We rely on ADSL equipment in the computer room to surf the Internet. A device can't pull unlimited ADSL broadband, usually hundreds. After expansion, it can be more. If it is full, it can't be loaded. This is the so-called device without a port. In addition, telecom lines are usually pulled to your residential area, usually 10-20 pairs of cables, and then pulled to your home from these cables. 10 pairs of users who will intelligently pull 10, even if you are full, it also refers to the line port, understand? Generally, the construction team is full, so you can ask him when it can be expanded, and it can be installed after expansion.