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In order to obtain DSL Stats & Diagnostic Info from the ZyXEL P660R-ELNK it may require setting it up for PPPoE if it is not already configured in that mode and you cannot reach it at it's web interface IP of ( » ). If you can reach the ZyXEL Web Interface right now at it's IP of then skip down to 3 pages and their thumbnail images for what info to post. If not, then read the steps directly below (depending on your use of Bridge Mode or a secondary Router follow the correct steps).

If it is in Bridge Mode the IP will not work (not found/unable to find or similar error) until you have made a few temporary changes to your setup. If you are using a Router behind the ZyXEL P660R-ELNK then you would remove the PPPoE login info from your second Router and then set that Router to DHCP temporarily in order to regain access to the ZyXEL P660R-ELNK at it's IP of (» ). You would then reset the ZyXEL P660R-ELNK modem so it starts up in Router Mode with it's DHCP server running so it can assign your Router or your PC a IP address using DHCP. If you were using the Windows or Linux PPPoE client instead of a second Router you would temporarily disable that from running, reset the Modem and setup the PC Ethernet Properties for TCP/IP to DHCP (Automatically Assign IP Address) instead. Then you would need to use the DOS command "ipconfig /release" (minus the quotes) then after 10 seconds the command "ipconfig /renew" (minus the quotes) so that the PC can now access the formerly bridged Modem. The DOS commands can be run in Windows by opening a DOS Command box. Click Start --- Run --- Type "cmd" (minus the quotes) --- Click OK and the DOS Command box will open ready for you to type the two ipconfig commands listed above into it one at a time.

HowTo setup a Zyxel P-660R-ELNK Router For PPPoE Mode

Then you will be able to access these following 3 pages for the stats.

Shows ADSL Stats page

Click Here for Full size Image

Shows Downstream Noise Margin Stats page

Click Here for Full size Image

Shows Upstream Noise Margin Stats page

Click Here for Full size Image

The Stats needed are under the Maintenance Menu on the Diagnostics Button - under the DSL Line menu option.

You want to post the first 3 lines from the Downstream Noise Margin button and the first 3 lines from the Upstream Noise Margin button.

Also post the output from the Maintenance Menu - System Status Page button at the very bottom that is marked "Show Statistics".

You can post screen shots (please use only .JPG or .GIF or .PNG image file formats if you chose to post images) like the three (3) images above or if you prefer you can also post just the numerical data right into your post by using copy/paste like the example below:

Note: Do not post tones as they are not needed.

noise margin upstream: 16 db
output power downstream: 6 db
attenuation upstream: 25 db

noise margin downstream: 13 db
output power upstream: 2 db
attenuation downstream: 39 db


System up Time: 0:10:22
CPU Load: 0.25%

WAN Port Statistics:
Link Status: Up
Upstream Speed: 384 kbps
Downstream Speed: 1536 kbps
Node-Link Status TxPkts RxPkts Errors Tx B/s Rx B/s Up Time
1-PPPoE Up 253 270 0 74 0 0:08:11

LAN Port Statistics:
Interface: Status TxPkts RxPkts Collisions
Ethernet 100M/Full Duplex 1072 919 0

That is all there is to it so you can easily add this info into your Earthlink DSL Forum post to get further help.


How do I check modem statistics/event logs? What do the numbers mean?

Although what is monitored and the exact name may be different depending on manufacturer, the overall information is pretty much the same. Below are some of the common terms and measurements used to judge line quality. Remember these are not hard numbers but simply a generalization of line statistics:

SN Margin (AKA Signal to Noise Margin or Signal to Noise Ratio)
Relative strength of the DSL signal to Noise ratio. 6dB is generally the lowest dB manufactures specify in order for the modem to be able to synch. In some instances interleaving can help raise the noise margin to an acceptable level. Generally speaking, as overall bandwidth increases, your signal to noise ratio decreases. So a customer that upgrades from 1.5 to 6.0 service will typically see a corresponding decrease in the signal to noise ratio. The higher the number the better for this measurement.
6dB or below is bad and will experience no synch or intermittent synch problems
7dB-10dB is fair but does not leave much room for variances in conditions
11dB-20dB is good with no synch problems
20dB-28dB is excellent
29dB or above is outstanding

Line Attenuation
Measure of how much the signal has degraded between the DSLAM and the modem. Maximum signal loss recommendation is usually about 60dB. One of the biggest factors affecting line attenuation is distance from the DSLAM. Generally speaking, bigger distances mean higher attenuation. The lower the dB the better for this measurement.
20dB and below is outstanding
20dB-30dB is excellent
30dB-40dB is very good
40dB-50dB is good
50dB-60dB is poor and may experience connectivity issues
60dB or above is bad and will experience connectivity issues

Note: The above info is not for the Zyxel 660R-D1 Router as they have their own FAQ entries.

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by Doctor Olds See Profile
last modified: 2008-02-11 18:37:46