A microfilter is a device that allows broadband to work at the same time as your phone service. Without microfilters you may get problems with your BT Broadband or hear noise on your phone line. Normally, you'll need a microfilter for every phone socket in your home where you've got some kind of telephony or broadband equipment plugged in.
A microfilter is a device that allows broadband to work at the same time as your phone service. Without microfilters you may get problems with your BT Broadband or hear noise on your phone line.
If your primary socket has one socket:
You must use a microfilter for every phone socket in your home with any phone or broadband equipment plugged in (including your Hub, phones, answer machines, digital TV boxes, and alarm systems).
If you need more microfilters, go to www.bt.com/shop >
If your primary socket has two sockets, like this:
You must always plug your Hub into the broadband connection on your primary socket. If you plug it into a phone socket or extension, it just won't work.
You don't need microfilters - not for your Hub or any other devices connected to phone sockets or extensions.
Set up rules and scenarios
- The microfilter must be the first thing connected to the primary socket, followed by any other equipment
- Avoid using extension cables for your Hub as they may cause problems with your connection. If you must use one, then use a new, high-quality broadband ADSL extension cable
- To connect more than one device to your phone line, you'll need a splitter. The splitter must connect to the phone part of the microfilter
- If you're trying to connect a EE TV box, this connects via Ethernet to your BT Hub.
- Some other TV services need a phone line, in which case the TV box must connect to the phone part of your microfilter. Please refer to your user guide or TV service provider for help
Video: How to fit a microfilter
Watch our video to see how to fit a microfilter to your telephone line.
Setting up microfilters - some common scenarios
Scenario 1: Simple set-up when your phone and Hub can both be near your primary phone socket.
Scenario 2: Set-up where the phone is connected near the primary socket and the Hub is located further away using an ADSL extension cable. Remember - using extension cables can affect your connection.
Scenario 3: Set-up where the phone and the Hub are located far away from the primary socket.
Scenario 4: Scenario showing how to connect a third-party set top box that needs a phone connection. The TV box connects to the phone part of the microfilter via a splitter. The phone connects to the other port of the splitter.
