Sorry if this is being posted in the wrong forum (I'm thinking my problem is line based instead of config based because the configuration has not changed in over a year).

I started having high packet losses (~25%) on my Streamyx connection (Aztech DSL208U modem connected directly to my Linux boxen) last Friday. It went down to 1% by Monday earlier this week but now its back to 30% packet losses.

Loaded up the modem on my Windows boxen to get the relevant diagnostic output (the linux ueagle-atm driver didn't provide the diagnostic information):

i) Margin upstream: 18 (doesn't seem to change)
ii) Margin downstream: 25 (doesn't seem to change)
iii) Attenuation: 0 (doesn't seem to change)
iv) DSL Frame counts: Upstream OK: xxx, Downstream OK: yyy, Upstream Error: 69 (xxx and yyy increase over time but Upstream Error never changes)

Brought the modem over to a friend's place and the packets loss is 16/10000 packets (which is certainly much better then the 30% packets losses I'm getting at my place).

I did a diagnostic test with the Windows utility that came along with the modem and it reports that:

i) Interface Text Configuration OK
ii) Modem Test Configuration (expected DSL mode: G.DMT, Data mode timeout: 60, VPI: 0, VCI: 35) OK
iii) Line Test configuration (OAM_VPI: 0, OAM_VCI:32, Number of cells to send: 5, OAM_LOOPBACK_TYPE: F5E2E): Failed with error "CO modem did not respond to OAM cells from RT modem; Possible causes: (1) The set of OAM VPI/VCI does not match the ones at the CO side (2) OAM LookBack type is no the proper type)
iv) Network test configuration (VPI: 0, VCI: 32, Expected driver type: WAN, Expected Encapsulation: Bridge_LLC): OK

So the questions are:

a) what's the problem?
b) why is the Line Test failing?
c) what are OAM cells and is the OAM_VPI and OAM_VCI values significant in the scheme of things?
d) "CO modem did not respond to OAM cells from RT modem" - what does this mean?
e) is the modem going to modem heaven? Or is it a Telekom/TMnet problem?

It would help if folk could help me, so that I can accordingly follow up with Telekom/TMnet if necessary. And if the problem is something non-obvious, I'd blog it so that others who have this problem can fix their problem accordingly

Thanks in advance.

guys i check my modem status today it become like this

Modem Status
Connection Status     Connected
Us Rate (Kbps)     512
Ds Rate (Kbps)     2048
US Margin     21
DS Margin     2147483642
Trained Modulation     ADSL_G.dmt
LOS Errors     7
DS Line Attenuation     12
US Line Attenuation     4

last time i check on 16/10/2007

Connection Status     Connected
Us Rate (Kbps)     512
Ds Rate (Kbps)     2048
US Margin     22
DS Margin     31
Trained Modulation     ADSL_G.dmt
LOS Errors     0
DS Line Attenuation     10
US Line Attenuation     4

using modem aztech 605ew

anyone know why my ds margin like that
or my modem got problem
using latest firmware on aztech website

help~~~~i've been facing frequent disconnections for few years already since i applied streamyx until now......i've been calling the tm technicians and they came to check but didnt find anything wrong. i oso called telekom came to change the copper wire but the problem still exist...
i've tried manual connection and connect the line directly without splitter oso.
been changing for more than 5 modems since the day i started using streamyx.

after all the things i've tried the SNR still seems very bad....what should i do now ?

this is the worst...anyone can help? > <

Set the OAM_VCI to 35, that's the correct value.

Made an official complaint to TMnet and all is good now. I never did touch the OAM_VCI value so I doubt that's the problem. VPI/VCI was set correctly. What's OAM_VCI anyway?

I think the only thing you can do is to make a SNR loss report to TMNet. Not via the useless hotline but via online report at https://tmbill.tm.net.my/iCoMSWeb/external/CreateCaseServlet

Make sure you put those screenshots together with the report.

hi...
my snr margin is ok, around 25~31. but the line attenuation is bad which is 33. the problem is, my connection time cannot stand more than 24hours, it mean, it will disconnect at least 1 time per day.I called to 100 for many times and at last they sent technician come to my house for checking. they said my phone line quite old and need to re-wiring, but not under their job, so they give me a number (not under TM, i think is private bussiness) and asked me call it in order to change the phone line wire. my question is, does it really solve my problem after re-wiring?

Line attenuation at 33 is not that bad I think.

For rewiring, I think unless it is done from the exchange to your house, probably will not make much difference. If only your house wiring are replaced but the ones outside is not, things will not really change a lot.

33 is not too bad, but i seen most of my friend, many of them is below 20, around 11~15 like that. their snr margin only around 30, the only diff. is the line attenuation, but then their connection can stand for a long period, 1 or 2 weeks w/o single disconnect. the technician said change the outside wire (above the house bumbung 1) to the inside house and my house is more than 20 yr old.

If that's the case, you can try changing the wires from the nearest pole to inside your house and see whether it will solve the problem. This will be trial-and-error as the problem can't be narrowed down yet. But with that figures you have, I think the problem lies way further upstream. Has the technician tried switching your port?

which figure? what's wrong with my upstream?

I don't know why recently my DS margin drops dramatically, the line attenuation is still normal without facing some disconnection. Anyone can tell me why it drops so much? It used to be a steady 30 but now take a look.

Link Status  Connected
Us Rate (Kbps) 512
Ds Rate (Kbps) 1536
US Margin 17
DS Margin 19
Modulation MMODE
LOS Errors 0
DS Line Attenuation 39
US Line Attenuation 29
Path Mode Interleaved

maybe our copper telephone line are old oredi. need to change to fiber one...mine also not stable.

which copper telephone line you meant by?

from your house to DSLAM.