Question about Zyxel Prestige 660R Router (91004397002)

1 Answer

Dsl light keeps flashing - Zyxel Prestige 660R Router (91004397002)

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert who has written 50 answers of more than 400 characters.


    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 173 Answers
Re: Dsl light keeps flashing

Your router is not synchronized with the line. You should power cycle your router (i.e)disconnect power cable from the router waith for 30 seconds and then reconnect, check if the dsl cable is connected properly to the router, if yes remove it once and the reconnect it, this should fix the problem. Are there any electrical devices near the router that are only switched on at that time of day and then switched off again in the morning. What i'm thinking is that you are experiencing REI or Repetitive Electronic Interference. This is caused by EMP emmisions form devices nearby. Have you had anything fitted recently that may be hardwired into you master socket, this will bypass your filter and cause interference on the line. The only other thing I can think of is that there maybe some engineering works going on at the exchange or on the line.

Posted on Nov 21, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

3 Answers

Theres no dsl light on the router, its a d link dsl2640b. so i need to know if its broke, the power light is on and the status light but no dsl light and no internet light on router, the pc is showing...

The flashing DSL light means that the modem isn't seeing the DSL signal on the phone line it's connected to. This might be due to modem failure, but it might also indicate a phone line problem. The most common trouble I run across is an unfiltered device connected on the line that interferes with the DSL signal. Other than the modem, all devices (phones, fax machines, security systems, etc.) need to be connected to the line through a filter. Check to be sure something hasn't been connected without a filter. Sometimes a phone gets moved or a new phone is added that gets plugged in to a handy jack without being filtered.

If you can, try connecting another modem to the line. You may be able to borrow one, or find one at a resale shop. I see them quite often for only a couple of dollars, leftover from people changing to FiOS or cable service. This can help determine if the modem is responsible.

One final possibility: your DSL service has been cut off. I've had two cases where loss of DSL was a phone company issue that they needed to fix at their office. (One following some wiring work done in apartment building, the other when service was mistakenly disconnected from the wrong customer.)

This kind of trouble can be a headache to solve, but it can be solved. Good luck and thanks for using Fixya!

May 21, 2011 | D-Link ADSL2/2+ Modem/Wireless Router...

1 Answer

My modems LAN light is blinking and I can't get Internet, I've tried unplugging it, but the problem still exists, please help

There will be 4 lights...


Power light indicates power supply is good...
Ethernet light indicates connection between modem and computer is good...
DSL light indicates connection between modem and telphone line is good... Also DSL light should be steady and it should not flash...
If it flashes then it says there is a lot of noise in telephone line...
Internet light says whether the internet status is connected or not...Internet light can flash depending upon the internet activity...

Feb 03, 2011 | Paradyne 6381 ADSL2+/ReachDSL Router...

1 Answer

Hi I have a 2700hg-b modem router. the dsl light flashes green then turns solid red. I know it is fried, but the circuit board looks good. I am willing to pay shipping to recycle it. is there anyone that...

The DSL light if it flashes in green, then it says it is trying to establish a connection with ISP...
Changes to red says "failed to establish the connection"...

The DSL light usually flashes green if there is a lot of noise in your telephone it is also advised to do a line test for your connection...

--->> Recycling the Modem is a good thing, definitely you will be getting a good answer from some tech...

Dec 09, 2010 | 2wire 2700HG-B Router (2700HGB)

2 Answers

Setup of d link dsl-2740b on my computer

the dsl connection is your broadband signal. check the router box. if the dsl light is off or flashing on the front, the setup will not work. this light needs to be solid. remove all devices from telephone sockets in your house, connect just one filter and your new router to it. check the dsl signal, if the light is solid green. the problem is with the physical setup in your house. If the dsl light still flashes contact your isp or broadband supplier.

Apr 15, 2010 | Routers

1 Answer

I have Verizon DSL service on my Westell 327w. It

whenever the connection drops, is the DSL light blinking?
because, it is just normal for the E1 light to blink, but the DSL light should be solid at all times.

It can be a possible issue with the cable or the LAN card, but you still need to have your line checked by Verizon to make sure that it is not a modem or a network issue.

Feb 21, 2010 | Westell Wirespeed VersaLink...

1 Answer

Dsl light flashes red constantly

Whenever your dsl light on the 2wire modem turns red,it only means that there is a problem with the dsl connection to the modem. Here are some ways on how you can isolate the problem

1. check if your modem is properly connected to the phone jack by unplugging and replugging you phone cable
2. try to reboot the modem
3. if still getting the same lights, contact your ISP

Nov 13, 2008 | 2wire HomePortal 1000HW DSL Modem and...

4 Answers

Westell 327 wireless router

you have the DSL filters plugged into all your telephones, but NOT plugged into the DSL modem?

is the DSL modem configured to automatically connect using your username and password?

have you tried using a different phone cable, or plugging into a different phone jack?

Mar 29, 2008 | Westell Wirespeed VersaLink...

1 Answer

DSL light flashing

Not-sync'd = No dsl signal.
First thing first- Unplug your modem for 10 seconds or so. Then see if your lights all come back on.

If you have phone service with your dsl, make sure you have dial tone in the phone jack you're trying to use. If not, then try a different phone jack. If you still can't get your dsl to work, then call the phone company and have them come out and fix your dsl.

Jan 14, 2008 | Westell Wirespeed VersaLink...

3 Answers


Hi. I will not repeat the check the phone line and resetting comments as it's now redundant.

I always have a spare modem as a line tester.

I've seen several 2700HG-B 2wire modem/routers burn out and every single time it's the DSL signal or modem portion that is burnt out. Even if you have two or three phone line surge protectors these 2700s are prone to shorting out unless you have a direct signal splitter DSL setup.

Here are a few things you can try to confirm if the 2700 is no longer functional on the DSL signal light problem.

#1: Turn on (plug in) your 2700 without the phone line plugged in and wait. If the DSL starts flashing red then there is a hardware problem in the modem/router.

#2: Plug the phone line into the 2700 while the dsl light is flashing red. It might take about 3 seconds however it should start to flash green and let it flash for about (usually) three minutes. If it turns red then the 2700 is indeed damaged.

#3: If you can enter into your modem using the http://2wire... and check the connection status. The first two status lines should read attempting to connect and no connection.

Nov 01, 2007 | 2wire 2700HG-B Router (2700HGB)

Not finding what you are looking for?
Zyxel Prestige 660R Router (91004397002) Logo

Related Topics:

181 people viewed this question

Ask a Question

Usually answered in minutes!

Top Zyxel Routers Experts

Courtney Lomax
Courtney Lomax

Level 2 Expert

83 Answers

 C. Dante
C. Dante

Level 3 Expert

623 Answers


Level 3 Expert

2072 Answers

Are you a Zyxel Router Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides