A phone line filter, also known as a microfilter, is a small device used with broadband internet services to separate the frequencies used by your phone and internet, ensuring optimal performance for both. It prevents interference between the two signals.
Essentially, phone line filters perform the following functions:
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Frequency Separation: They filter out the higher frequencies used by broadband, preventing them from interfering with the lower frequencies used for voice calls on your phone line.
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Signal Clarity: By removing these higher frequencies, they help eliminate static and other noise on your telephone line, ensuring clear voice communication.
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Optimal Broadband Performance: By isolating the broadband signal, the filter helps maintain a stable and reliable internet connection.
Why are Phone Line Filters Needed?
Without a filter, the frequencies used for broadband internet can cause interference on your phone line, resulting in:
- Static or noise during phone calls.
- Poor voice quality.
- In some cases, even dropped calls.
Where to Use Phone Line Filters
Filters are generally required on every phone device connected to a phone line that shares a broadband connection. This includes:
- Landline phones: Plug the filter directly into the wall jack, then plug the phone into the filter.
- Answering machines: Same as with landline phones, filter between the wall jack and the answering machine.
- Fax machines: As with other phone devices, insert the filter between the wall and the fax machine.
Important Note: A filter is not needed on the modem or router that provides your broadband internet service.
What Happens if Filters Aren't Used?
Failure to use phone line filters, or incorrect installation, can result in:
- Static on your phone line.
- Reduced broadband speed and reliability.
- Disrupted phone calls.
