what does a dsl phone line filter do

Full Answer

Are DSL line filters necessary?

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.

Does a DSL filter help?

The main advantage of DSL filters is that, by cutting out interference from other devices, they help make your DSL Internet faster. Another advantage is that a DSL filter will allow you to use other devices connected to the phone line at the same time without experiencing a slowdown in Internet speeds.

What is a phone filter used for?

Phone filters, also known as microfilters, must be used with your Broadband service to ensure optimal performance. These filters eliminate the higher end frequencies used for your high speed access. When phone filters are not used, or not installed correctly, you'll experience static on your telephone line.

How do you use a DSL phone filter?

0:020:58How to install your CenturyLink DSL filter - YouTubeYouTubeStart of suggested clipEnd of suggested clipWithout having a negative impact to your service you must have a filter installed to connect anyMoreWithout having a negative impact to your service you must have a filter installed to connect any other device to the phone line for example a phone fax tv equipment like dish or directv.

How do you know if your DSL filter is bad?

Check to see if you have a defective DSL filter. Turn off (unplug) your DSL modem and then make a test call from your phone. If you don't hear static on the line, then a DSL filter is likely the problem.

How can I improve my DSL connection?

How to Boost DSL Internet? Improve your Internet SpeedCheck for Malware or Viruses. ... Test your DSL Internet Speed. ... Reboot your Router. ... Get a POTS Splitter. ... Get a DSL Filter. ... Check Software and Hardware. ... Minimize Interferences. ... Get a Wireless Repeater.More items...•

What happens if you don't use ADSL filter?

Without microfilters you may get problems with your BT Broadband or hear noise on your phone line. 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).

Is a DSL filter the same as a splitter?

A DSL filter (also DSL splitter or microfilter) is an analog low-pass filter installed between analog devices (such as telephones or analog modems) and a plain old telephone service (POTS) line.

What is a 2 wire DSL filter used for?

2Wire 2-line in-line DSL filter with modem giveback port eliminates all the interference between your DSL line and analog telephone lines, resulting in clear lines for all your analog devices. This filter works with any 2-line phone device.

At what location should you place the DSL filter?

DSL filters block the high frequency DSL signals from being transmitted to the telephone. For most installations, it is recommended that you connect the plug end of the DSL filter into the telephone jack, then connect a telephone line cord between the jack end of the filter and your phone.

Are all DSL filters the same?

It may use different technology. If they are exactly the same, no noise will be produced. If they are different, it may not filter out all of the background noise that is present on the line due to both signals being sent over the same wires.

Do I need a DSL filter with Comcast?

DSL filters are not needed with Comcast's home phone service.

At what location should you place the DSL filter?

DSL filters block the high frequency DSL signals from being transmitted to the telephone. For most installations, it is recommended that you connect the plug end of the DSL filter into the telephone jack, then connect a telephone line cord between the jack end of the filter and your phone.

Do I need filters on my phone line?

You'll need a filter for every phone socket in your home with telephone or broadband equipment plugged in. This includes routers, phones, answering machines, digital TV boxes and even alarm systems. A filter has two ports: A port for connecting your router or modem.

Is a DSL filter the same as a splitter?

A DSL filter (also DSL splitter or microfilter) is an analog low-pass filter installed between analog devices (such as telephones or analog modems) and a plain old telephone service (POTS) line.

What is a 2 wire DSL filter used for?

2Wire 2-line in-line DSL filter with modem giveback port eliminates all the interference between your DSL line and analog telephone lines, resulting in clear lines for all your analog devices. This filter works with any 2-line phone device.

What is a wall mounted phone filter?

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.

What happens if you don't have a filter?

When devices aren’t connected to a filter, or filters are installed incorrectly, you can experience: 1 Static or a hissing sound on your telephone line 2 Slow Internet speeds 3 Intermittent connection to the Internet 4 No connection to the Internet

How many filters does Blackfoot have?

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.

What is a DSL filter?

A DSL filter (also DSL splitter or microfilter) is an analog low-pass filter installed between analog devices (such as telephones or analog modems) and a plain old telephone service (POTS) line.

What is a whole house DSL filter?

If Category 3 cable, Category 4 cable, or Category 5 cable was used to wire the premises and at least one pair of wires in the cable is unused, a "whole house" DSL filter can be installed at the point of entry, usually a Network Interface Device (NID) box.

How to tell if a DSL filter is failing?

The usual procedure to test for failed filters is to remove all filters and all other devices and extension cables from the telephone line. Then connect the DSL modem or router directly to the main phone line socket and check to see whether the internet speed increases or disconnects reduce. If this works, one or more microfilter (s) used with the analog devices need to be replaced.

What is the wire pair that connects to a telephone?

The wire pair that connects to telephones and fax machines is connected to the telephone company feed through the filter, while the wire pair that connects to the DSL modem is connected directly to the telephone company feed, unfiltered.

What is the difference between high quality and low quality filters?

The primary distinguishing factor between high-quality and low-quality filters is the use of transistors in high-quality (and more expensive) active filters, in addition to the usual components like capacitors, resistors, and ferrite cores, while the low-quality passive filters lack transistors.

When was the low pass filter invented?

The concept of a low pass filter for ADSL was first described in 1996 by Vic Charlton when working for the Canadian Operations Development Consortium: Low-Pass Filter On All Phones.

Can DSL cause noise?

Without DSL filters, signals or echoes from analog devices at the top of their frequency range can reduce performance and create connection problems with DSL service, while those from the DSL service at the bottom of its range can cause line noise and other problems for analog devices.

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Product details

Achieve crystal clear sound from your phone connection with the DSL Phone Line Filter. This filter eliminated telephone interference within the DSL band by interrupting the signal. You need one filter for each telephone device (telephone, fax machine, or answering machine) sharing a DSL line. Installation is easy and no wiring is required.

What is a low pass filter for a telephone line?

The signal to telephone output is generally just low-pass filtered so that voice frequencies (frequencies up to 3.4 kHz) get nicely though , but higher frequencies gets filterted . This filtering generally consista of LC low-pass filter designed to some suitable operating frequency between 4 and 20 kHz (between voice and ADSL bands). This kind of filter causes that the high frequencies of the ADSL signal will be severely attenuated (usually by at least 30dB with a good filter) so the signal reaching your telephone equipment does not contain such amount of high frequency signals that could cause noise. The telephone LC filter is also designed in such way that the filter impedance towards the line that carries ADSL signals is high at the high frequencies, meaning that those telephone equipment and cables related to them look like they are look to high freuquency signals that they would ne "disconnected from the main line". line.

What is an ADSL filter?

An ADSL filter is normally a small plastic box with a short lead that plugs into your phone socket and two outputs, one for your ADSL Modem and another for a telephone. Some filters have only one telephone output in them. ADSL filter select the band of frequencies for each of the outputs, phone or ADSL, and send just the correct band to the appropriate socket. The phone output gets only telephone frequencies (from DC to 3.4 kHz) and the ADSL output gets the higher freuquencies well (above 25 kHz).

How much ohms does a telephone wire have?

The total series resistance this kind of filter cause to one telephone wire was around 45 ohms, meaning that having this filter adds around 100 ohms to the telephone wire resistance. The series resistors and internal coil resistance reduces the impedance mismatches that just putting a capacitor across telephone, wires would cause. If we take a look at the circuit construction with only resistances and capacitances in it, it is pretty close to a simple model of 0.5 km of 0.5 mm telephone cable wire. The coil impedance at voice frquencies would be at 20-200 ohms, causing some mismatch and attenuation at high telephone frequencies. The capacitor has impedance of aroudn 250-2500 ohms at voice frequencies. Return loss at voice frequencies (against 600 ohms) would be acceptable with this kind of circuit.

Why do ADSL splitters need surge protection?

Because ADSL splitter filter connects directly to the subscriber's loop media, it must also provide some surge protection from externally induced voltage which could damage any attached equipment or endanger humans interacting with the installed equipment. The ADSL splitters in the central ofice typically include overvoltage protection components to protect the ADSL DSLAM agains overvoltages on the line. Some filtered ADSL outputs provide protection from the high frequency transient and impedance effect that occur during POTS operations (ringing transients, on-hook, off-hook transient and so on).

What equipment is needed to separate ADSL signals?

For good system performance it is very important that all your other telephony equipment is separated from the ADSL signals by the use of a splitter / filter -- this equipment includes telephones, answering machines, "normal" computer modems, etc, etc.

What frequency does an ADSL filter work on?

The phone output gets only telephone frequencies (from DC to 3.4 kHz) and the ADSL output gets the higher freuquencies well (above 25 kHz).

How many ohms should a filter have?

Should not have too high series resistance (commercial filters seems to have between 50 and 100 ohms for whole loop resistance)

Why does DSL work with phone?

Because DSL uses a different frequency for data than phones use for voice, the two signals don’t interfere with or help each other. Home phone and DSL Internet basically work around one another even as they use the same landline for transmission.

What is a home phone and DSL bundle?

A bundle is a package deal that a provider offers to help customers save money. Depending on the service provider, bundles can combine home phone, internet, and sometimes TV service as well. There are multiple benefits to combining services, including cost savings, simplified billing, and centralized customer service.

Do I need a home phone to get DSL Internet?

You can now choose from either a standalone DSL line or an internet and phone bundle from your Internet Service Provider (ISP). If you don’t currently use a home phone and don’t need one, you can still take advantage of a DSL internet connection.

Is there any advantage to having both a home phone and DSL?

If you currently have a home phone line, one of the main benefits of DSL internet is that you can surf the internet and catch up with friends or relatives over the phone without any disruption to either service. Another benefit of DSL internet is that it works like your home phone in the sense that the line completely belongs to you. You always get an instant connection and there’s no one else sharing your bandwidth or fighting for speed during peak hours.

Why bundle DSL and home phone?

Bundling DSL and home phone service makes a lot of sense because both services use the same landlines to work. And, unlike dial-up internet, there’s no competition for the line. You can surf and talk all you want—at the same time—without running into any interference between your phone and DSL connections.

What is a bundle phone?

What is a home phone and DSL bundle? A bundle is a package deal that a provider offers to help customers save money.

Is it better to bundle DSL and phone?

For those who want to save on their monthly bills, the value of a bundle is probably the biggest advantage of having both a home phone and DSL. When you combine your home phone and DSL subscriptions with the same ISP, you can receive significant savings on both services. If you already rely on a home phone or are considering adding one for emergencies, a home phone and DSL bundle can be the smartest, most frugal option.

Overview

Installation

Typical installation for an existing home involves installing DSL filters on every telephone, fax machine, voice band modem, and other voiceband device in the home, leaving the DSL modem as the only unfiltered device. For wall mounted phones, the filter is in the form of a plate hung on the standard wall mount, on which the phone hangs in turn.
In cases where it is possible to run new cables, it can be advantageous to split the telephone lin…

Components

Modulation techniques and specifications

Maintenance and failure

See also

External links