What is a DSL filter?

When you have Internet and telephone service provided on the same line, you need to use filters. DSL filters separate the incoming signal, so you can be online and still use your phone, DVR and other devices.

When devices aren’t connected to a filter, or filters are installed incorrectly, you can experience:

• Static or a hissing sound on your telephone line
• Slow Internet speeds
• Intermittent connection to the Internet
• No connection to the Internet

Which devices do I need a DSL filter for? 

Every device that connects to your phone line – except your modem – needs a DSL filter. For example: Telephones, caller ID units, answering machines, satellite TV receivers, cable boxes, DVRs, TiVos, fax machines, security systems and automatic water meters.

How do I install a DSL filter?

You should have received 2 filters from Blackfoot along with your modem – one that is single port and one that is dual port.

Filters are plugged in between your jack and your device. To install one, plug the filter into a wall jack, and then plug a phone cord or other device into the other end.

If you only have one wall jack for the phone and the modem you can use the dual port filter provided to you with your modem. Make sure to plug the filter into the wall jack and the modem and phone into the filter.

Need additional filters? Please contact our Technical Support Team.

What if I have a wall mounted phone?

A wall mounted filter can be used for wall-mounted phones that a wall jack filter can’t fit behind. You can purchase these at any electronics store.