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Carver

@embarqhsd.net

[Embarq] Zyxel 660 FREQUENTLY drops connection, DNS issue?

I am troubleshooting neighbors system. Not sure if it is Embarq or centuryTel. sry.

I am constantly monitoring the router through a wireless connection courtesy a meraki node.

System Name: EMBARQ
ZyNOS F/W Version: V3.40(ACZ.9) | 11/07/2007
DSL FW Version:TI AR7 07.00.02.00
Standard:ADSL_G.dmt

The problem: Clients inform me, and I have confirmed thru Meraki dashboard, that the connection drops frequently. Last couple of days, the system goes down several times a day, and I have to log on to the router, and reboot it. I am able to log in via the wireless connection, so it is obvious that that is not the problem, as it is also obvious that the 660 is still powered. Each time the system fails, 'web configurator statistics' 'WAN port Statistics' shows 0 Rx B/s. Additionally, in WAN info , Active, Primary, and Secondary DNS will all list as 0.0.0.0 Then I go into diagnostics, general, and reset the system, it starts to work again, for a random length of time.
The modem was just replaced recently, because my neighbor contacted customer service, before I got involved, and had a new modem sent out, due, apparently, to this same problem.
As I have, I believe, traced the problem back to the wall outlet, is it possible that it is a problem with inside-the-home wiring? Or is it a problem with DNS servers? Can I reset to OpenDNS? Thanks, and I hope I have provided all pertinent info.


almex
Premium
join:2001-09-18
Mesa, AZ
The 660 has a section to run line diagnostics (sorry, I'm not at home so I can't tell you what path to follow). It may be helpful to check the line noise & attenuation.
--
"Careful, we don't want to learn from this!" --Calvin & Hobbes


Carver

@embarqhsd.net
I do not know how to interpret this data, but here are the results of Diagnostics on DSL Line:

noise margin upstream: 21 db
output power downstream: 19 db
attenuation upstream: 15 db
tone 0- 31: 00 00 00 06 78 99 99 99 99 88 88 88 77 66 43 20
tone 32- 63: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 64- 95: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 96-127: 20 0f 1e 0e 0e ff ff fe ff fe fe fe fd 0e 0f 1f
tone 128-159: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 160-191: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 192-223: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 224-255: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 256-287: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 288-319: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 320-351: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 352-383: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 384-415: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 416-447: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 448-479: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 480-511: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

noise margin downstream: 15 db
output power upstream: 12 db
attenuation downstream: 27 db
tone 0- 31: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 32- 63: 45 56 77 78 88 88 88 88 88 87 77 77 77 66 66 66
tone 64- 95: 06 66 66 66 66 66 66 66 66 66 66 66 66 66 66 66
tone 96-127: 66 66 66 66 66 66 66 66 66 66 65 55 55 54 44 44
tone 128-159: 44 44 44 44 44 44 45 55 55 55 55 55 55 55 55 55
tone 160-191: 44 44 44 44 44 44 44 44 44 33 33 33 33 33 33 33
tone 192-223: 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33
tone 224-255: 22 22 22 22 22 22 22 22 22 22 22 22 23 33 33 33
tone 256-287: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 288-319: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 320-351: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 352-383: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 384-415: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 416-447: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 448-479: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
tone 480-511: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00


billaustin
they call me Mr. Bill
Premium,MVM
join:2001-10-13
North Las Vegas, NV
kudos:5
reply to Carver
If the modem keeps losing sync, and needs to be reset, it is either a wiring, line, or modem issue. Since the modem has been replaced, it's likely either the line or the wiring. [Do they have an alarm system connected to the phone line?]

First thing to do is have them connect the modem directly to the NID and get the statistics again. See if there is a significant difference between the readings. The attenuation and noise margin are the numbers to watch.

Have them check their own wiring. Unless there is a whole-house filter at the NID, every device connected to a phone jack needs to have a filter on it, except for the modem. There is a two port filter to use if they need a phone next to the modem.

If you can't find anything that is causing a problem, then they will need to call for a line check. There could be an issue in the line between the NID and the DSLAM, and it could be a failing port on the DSLAM.


Carver

@embarqhsd.net
Thanks for the input. I will check these issues, and reply with r=the results.


Carver

@embarqhsd.net
Allright. Here are the test results from attaching the modem directly to the NID, followed by results after returning the modem to it's inside jack.

NID:
DSL Line

ATM Status
SAR Driver Counters Display:
inPkts = 0x00001e99, inDiscards = 0x00000001
outPkts = 0x000010aa, outDiscards = 0x00000000
inF4Pkts = 0x00000000, outF4Pkts = 0x00000000
inF5Pkts = 0x00000001, outF5Pkts = 0x00000001
openChan = 0x00000002, closeChan = 0x00000000
txRate(Bps) = 74, rxRate(Bps) = 382

Upstream Noise Margin
noise margin upstream: 21 db
output power downstream: 19 db
attenuation upstream: 15 db

Downstream Noise Margin
noise margin downstream: 30 db
output power upstream: 12 db
attenuation downstream: 25 db

In-home:

DSL Line

ATM Status
SAR Driver Counters Display:
inPkts = 0x00374f70, inDiscards = 0x00000000
outPkts = 0x002211a4, outDiscards = 0x00000018
inF4Pkts = 0x00000000, outF4Pkts = 0x00000000
inF5Pkts = 0x00000000, outF5Pkts = 0x00000000
openChan = 0x0000000e, closeChan = 0x0000000c
txRate(Bps) = 3838, rxRate(Bps) = 7862

Upstream Noise Margin
noise margin upstream: 21 db
output power downstream: 19 db
attenuation upstream: 15 db

Downstream Noise Margin
noise margin downstream: 16 db
output power upstream: 12 db
attenuation downstream: 27 db

I really don't understand much of this, but would like to learn. I am the neighborhood tech-guy, though I have not had formal education. If anyone can point me to a site, such as MIT Opencourse Notes, for example, or can explain the details of attenuation and Noise margin, or even a simple chart of "this is good, this is bad" I would really appreciate it. Thanks, Todd Meraki network operator, WCN Toddmission Texas.

NO SOPA!


Carver

@embarqhsd.net
reply to Carver
Allright. Here are the test results from attaching the modem directly to the NID, followed by results after returning the modem to it's inside jack.

Additionally, customer/neighbor just told me that connection is frequently lost when phobe calls are received.

NID:
DSL Line

ATM Status
SAR Driver Counters Display:
inPkts = 0x00001e99, inDiscards = 0x00000001
outPkts = 0x000010aa, outDiscards = 0x00000000
inF4Pkts = 0x00000000, outF4Pkts = 0x00000000
inF5Pkts = 0x00000001, outF5Pkts = 0x00000001
openChan = 0x00000002, closeChan = 0x00000000
txRate(Bps) = 74, rxRate(Bps) = 382

Upstream Noise Margin
noise margin upstream: 21 db
output power downstream: 19 db
attenuation upstream: 15 db

Downstream Noise Margin
noise margin downstream: 30 db
output power upstream: 12 db
attenuation downstream: 25 db

In-home:

DSL Line

ATM Status
SAR Driver Counters Display:
inPkts = 0x00374f70, inDiscards = 0x00000000
outPkts = 0x002211a4, outDiscards = 0x00000018
inF4Pkts = 0x00000000, outF4Pkts = 0x00000000
inF5Pkts = 0x00000000, outF5Pkts = 0x00000000
openChan = 0x0000000e, closeChan = 0x0000000c
txRate(Bps) = 3838, rxRate(Bps) = 7862

Upstream Noise Margin
noise margin upstream: 21 db
output power downstream: 19 db
attenuation upstream: 15 db

Downstream Noise Margin
noise margin downstream: 16 db
output power upstream: 12 db
attenuation downstream: 27 db

I really don't understand much of this, but would like to learn. I am the neighborhood tech-guy, though I have not had formal education. If anyone can point me to a site, such as MIT Opencourse Notes, for example, or can explain the details of attenuation and Noise margin, or even a simple chart of "this is good, this is bad" I would really appreciate it. Thanks, Todd Meraki network operator, WCN Toddmission Texas.

NO SOPA!


billaustin
they call me Mr. Bill
Premium,MVM
join:2001-10-13
North Las Vegas, NV
kudos:5
The drop in the Noise Margin from 30 to 16 and the attenuation increase from 25 to 27 between the NID and the inside jack indicates an internal wiring problem. It could be as simple as a bad or missing filter, indicated by the connection drop when calls are active, and it could be corroded connections somewhere in the wiring.

Check all the phone jacks in the house. Every one with a device attached needs a filter, except the modem jack. There are two-port filters available if a phone needs connected next to the modem.

If this does not clear up the problem, I would recommend a whole-house filter at the NID. The voice side would connect to the existing house wiring, the data side would connect to a new wire run to a new jack specifically for the modem.


Carver

@embarqhsd.net
Alright. Thanks again! Will check, and report results.