Question about 2wire Single Port DSL Line Filter (21869)

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2WIRE Single Port DSL Line Filter

Hello, the 2wire single port dsl line filter just stopped working. The Ntwk light doesn't come on (and cannot access DSL) and then the power light went out. I have tried the adapter in other jacks, with the same results. Is this a common problem?

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Re: 2WIRE Single Port DSL Line Filter

I think when you purchased the 2wire modem it usually comes along with 3 sets of single port dsl line filters, try out those other filters see which one works. if the local network light doesn't come on, (are you using 2wire 1000 series?), check the network adapters in your computer, this usually happens when you are using lower versions of OS. try the power outlet in the kitchen / bathroom, if power light doesn't come on, push the reset button for 30 secs. if power light is still off or red, then you may need to replace the modem (check if it's still under warranty, if not you will need to buy a new one.) also you should be using the same power adapter that came with the modem, check the specs. sometimes if the modem is more or less than 3 years old, they could get defective especially if it's often affected by sudden power surges.

Posted on Apr 02, 2008

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the filters are for the phone not the modem

Feb 22, 2012 | 2wire Single Port DSL Line Filter (21869)

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Cannot connect to my Internet. On my 2Wire modem at home, The Power LED light is solid green, the Ethernet LED light is green, the DSL LED light is continually flashing, and there is NO Internet LED...

With the DSL light always flashing, it means that either the ADSL signal (synchronization) does not reach your modem, or your modem cannot 'read' the signal.

You need to determine if the problem is from one of the following places :
  • outside of your house (your land line or ISP equipment) or from the modem;
  • your telephone-cable inside your house or
  • one of your equipment;

Try the following manipulations to determine from where the default comes :

  1. Determine if the problem is in your house or on the land line
    • Unplug each and every equipment which is connected to your telephonic installation (Fax, phones, answering machines etc);
    • Using the shortest telephone cable (RJ11) you possess, plug only your modem to the main telephone jack of your house.
    • If the DSL LED still flashes continuously, the problem is somewhere between your ISP's equipment and your house. You should call them and expose the situation. At this stage, you can't do much else.

  2. Determine if the problem is in your house installation
    If the DSL LED lights up when it is plugged to the main telephone jack, then it is either one of your equipment which is at fault, or the house installation. To pinpoint the problem, do the following :
    • With all the other equipment still unplugged, try the modem on all the other telephone jacks you have around the house.
    • If the DSL flashes continuously on one of the jacks, you will have found the source of your miseries. Depending on your ISP's terms and conditions, you will either have to call them of call for the services of a third-party technician to solve the problem.
    • If the DSL lights up correctly on all the telephone jacks, then your house telephone installation is good. Proceed to the next series of tests.

  3. Determine which equipment is at fault
    • Plus your modem to one telephone jack and wait for the DSL line to light solid.
    • Use a splitter (ADSL filter) to plug the equipments you possess (telephone, fax etc) one by one. Verify each time if the DSL LED is still lit or flashes continuously.
    • If one of the equipment causes the DSL LED to flash, it is that equipment which causes your problem.
    • If every equipment causes the DSL LED to flash, the it is the splitter (ADSL filter) which is causing the problem. You can confirm this hypothesis by testing each and every ADSL filter you have in your possession.
    • Replace any faulty equipment and you should have eliminated the problem.
If nothing of this solves your problem, you won't have any choice but call you ISP. Don't hesitate to tell them all tests you will have done.

May I also make some recommendations :
  1. Use a power surge protector (not a UPS though) to plug your modem to the electric outlet BUT plug it directly to the telephone jack;
  2. Make sure your modem is plugged in as far as possible from UPS, television, etc.;
  3. If possible, don't plug the modem in the same electric outlet as other equipments;
  4. Don't use any telephone extension cable to plug your modem to the telephone jack.

Hope this helps you. Let me know what happens next.

May 11, 2011 | 2wire (1000-000057-000) Modem

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My DSL 2wire modem always blink like crazy.

DSL light blinking green/red indicates you do not have a solid connection to your DSL signal. Typically this can be anything from the connections at your home all the way to the connections with your ISP. As I do tech support for this model of 2wire modem all day long here is what I would tell you to do if you were calling me:

Are you using the proper length of phone cord (15ft or less): people sometimes have a longer phone cord in use and while it MAY work for a while outside conditions will effect the DSL signal enough that it no longer cuts the mustard. The longer the phone cord the more resistance a signal has in reaching the modem.

Filters: Typically the 2wire modem comes with 3 1-way filters and a single 2-way filter. Often people put the wrong filter on the modem, which doesn't even require one, or they put the correct filter (2-way filter) but hook it up to the wrong end (that is to say it should be connected to the DSL side of the filter). All other devices in the house such as phones, fax machines, Tivos, DVRs, Sat TVs, and monitored alarm systems (AKA anything ELSE connecting to/using the phone system) should be on filters.

Phone service: Do you have phone service? Do you have a dial tone or static? If so all problems with phone service will effect your DSL service as that is how the DSL service is piped into your home...that is to say through the phone line. Do not contact your ISP for this problem as it is a phone line problem creating your internet problem.

Phone jack location: Have you tried moving the modem, it's power cord, and proper length phone cord to another jack? Granted the argument that "it worked yesterday, so it should work today" is a strong one but sometimes putting the modem on another jack JUST to test out any potential wiring problems is a helpful one and could save you a lot of frustration. If one jack gives you red/green DSL lights and the other gives you solid green...that should speak for itself.

ISP provider: IS your service turned on? It may be a shall we say....obvious but if your service has been turned off, or not even turned on yet, then that would be why. In addition, if the above does not help in determining what the problem is, a technician may need to be dispatched to determine where the fault lies. Sometimes it's the box down the road and sometimes it's a few miles away.

Jan 15, 2010 | 2wire (1000-000057-000) Modem

1 Answer

Disconnects whenever we recieve a call regardless of having filters on all the phones in the house

This is odd behavior; have you tried moving your DSL modem to a different phone outlet in the house? If you do so, make sure to move the filters around appropriately as well; the only type of filter the DSL modem should be connected to are the "Y" type filter that has a "DSL" port as well as a "phone" port.


Do you have an alarm system? If so, it will need a filter too. Try contacting your alarm company and asking them if the system has a filter installed. If they don't know, try to get inside the control box (the large metal box, not the keypad) and see if there's a filter installed - it should look pretty similar to a regular phone line filter.

If you don't see one, ask your alarm company if you can install it yourself and how to do so, or ask that they install one for you. Be aware though, they may try to charge for a technician dispatch; if the alarm system was installed after you got DSL, insist that they do it free of charge, as the installation technician should've asked whether you had DSL and installed a filter at the time of the alarm installation.


Also, I might suggest trying to disconnect all phones in the house (at the wall jacks), and then call your home phone from a cell phone and see if you still get disconnected. If you don't, try connecting one phone at a time and repeating this test until you do get disconnected.

At that point, try unplugging all the other phones except the last one you reconnected and test again. If it disconnects when you call, then this phone or its filter is your problem; if it doesn't disconnect, it may have to do with the number of devices attached to your line.

If you've narrowed it down to a single phone/device that is causing the issue, try swapping that device's line filter with another phone's filter that previously tested okay, and plug only the problem device in with the new filter - if your connection stays up when you call, you've got a shorted filter that needs to be replaced. If your connection still drops, there's something with that particular device that's causing issues; you may have to call the manufacturer of the device and see if they've had reports of similar problems.

Oct 30, 2009 | 2wire (1000-000057-000) Modem

1 Answer

2WIRE 2701HG-B with flickering DSL light.

The DSL is out in your area or the phone line has been disconnected.
I would contact ATT&T to find out if thire is a service issue in your area

Aug 15, 2009 | 2wire Modems

1 Answer

Modem won't connect to internet. OS: WinXP Pro SP 3. ISP: Earthlink DSL. Modem: ZyXEL P-660R-D1 (supplied by Earthlink) connected to computer with ethernet cable. Modem includes double filter for phone...

maybe you have to wait for your provider for them to isolate the problem, it seems that your modem got hit maybe by high surge. ask them to bring a spare modem for isolation.. there is no way for you to isolate the problem coz you've already done the basic....

Jun 19, 2009 | Modems

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Current modem working fine with ATT DSL. I want to install a second modem (2wire) by direct connection to same DSL phone connection (in different room). I have hooked up other modem, filled in user ID and...

Is that second location also a DSL line? You may have to consult with AT&T to see if the DSL line runs to that second location.

What are you trying to accomplish? By adding a second modem, you essentially create two separate networks. Why not use a switch and connect it to the first modem, which would allow you to connect more PCs.

Apr 16, 2009 | 2wire (1000-000057-000) Modem

1 Answer

Orkut block in utstarcom dsl

download ultrasurf 9.5
search in google

Jul 05, 2008 | 2wire Single Port DSL Line Filter (21869)

2 Answers

2Wire-3700 dsl red light blinking after a thunderstorm


If you are att customer, you will be charged $60 only if there is problem inside your premises, otherwise they wont charge you.

Is there any phone connected with your DSL line? if so is it working? if its not working, contact customer support and tell them its not working

If the phone is working, you have to check the connections between the phone line to the modem. As the DSL light is blinking red, its the problem with line and not the modem.

Take care

Jun 07, 2008 | 2wire (1000-000057-000) Modem

1 Answer

Suddenly lost internet connection on 2Wire DSL modem

hmmm...only thing that makes sense here is that your dSL is unhappy...did you check that phone line into the modem? that's what the internet light means when it's out, actually..if its not the line, then it's the modem..

not much else that is off on this.

check your computer warranty here 4 FREE

Feb 28, 2008 | Modems

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