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eggonlea

join:2012-12-16
Cupertino, CA

Poor down/up rate...

Looks like there're more people at this forum. Forward my post here from »forums.sonic.net/viewtopic.php?f···84#p6184

Poor down/up rate...
by eggonlea » Sat Dec 15, 2012 9:26 pm

I just installed the sonic.net internet two days ago. Today I found the network speed was unbelievable slow.

Could anybody help me take a look?

Summary

Broadband
1280Kbps
50Kbps

Firewall
Status
Enabled

4111N-030
Serial Number:
23121E004230

DSL Details

Modem Type: Built in modem - ADSL
DSL Line Line 1 (inner pair)
Down Up
Rate: 1280 kbs 50 kbs
Max Rate: 1628 kbs 32 kbs
Noise Margin: 6.9 dB 19.3 dB
Attenuation: 50.5 dB 35.2 dB
Output Power: 0.0 dBm 10.1 dBm

Protocol: G.DMT2 Annex A
Channel: Interleaved
DSLAM Vendor Information Country: {46336} Vendor: {IFTN} Specific: {29125 }
ATM PVC: 0/35

Rate Cap: 0 kbs
Attenuation @ 300kHz: 47.2 dB
Required Impulse Noise Protection: 0
Uncanceled Echo: 17.7 dB Suspicious - check phone filters and alarm
VCXO Frequency Offset: 0.0 ppm Ok
Final Receive Gain: 20.5 dB Ok
Excessive Impulse Noise: 0 Ok
eggonlea

Posts: 3
Joined: Sat Dec 15, 2012 9:23 pm
Top
Re: Poor down/up rate...
by eggonlea » Sat Dec 15, 2012 9:27 pm

BTW, I tried to power it off and on but nothing becomes better.

I once got at least 6M/1M two days ago. And I didn't touch anything especially the wires...
eggonlea

Posts: 3
Joined: Sat Dec 15, 2012 9:23 pm
Top
Re: Poor down/up rate...
by eggonlea » Sun Dec 16, 2012 11:06 am

Called the support hotline. It gets a little better now - 1.6mbps/600kbps. Still much slower than before. But at least it doesn't drop again and again. Let me try to use it and see what would happen.



NormanS
I gave her time to steal my mind away
Premium,MVM
join:2001-02-14
San Jose, CA
kudos:11
Reviews:
·SONIC.NET
·Pacific Bell - SBC

I have a friend who tried the AT&T 6.0Mbs service (their legacy ADSL), and showed a very low SNR (below 6.0 dB) on a line with excellent attenuation. In her case it turned out to be premises wiring; she cleaned it up, and got appropriate SNR and the full 6016/768 modem rates for Elite.

I support a relative with Fusion whose line gets ~5800/500 sync with SNR=6.0 dB, attenuation 51.5 dB, so your connection should be better. If you can test at the NID, you would know if it is the premises wiring, or in the plant, most likely between the NID and the SAI (Serving Area Interface), aka, "cross connect". I have seen DSL trouble (accompanied by voice line trouble) fixed by repairs to the F2 span between the NID and SAI.
--
Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum


eggonlea

join:2012-12-16
Cupertino, CA

Thanks for sharing the experience! Sonic technician will come to take a look on Tuesday. Hope he can figure out the root cause.



leibold
Premium,MVM
join:2002-07-09
Sunnyvale, CA
kudos:10
Reviews:
·SONIC.NET
reply to eggonlea

Your attenuation is very high. Either you are on a very long loop or there is a wiring problem. The download speed of 1.5Mbps would be appropriate for a long loop with such high attenuation. However the upload speed is ridiculously low (well below what is normal for such a loop length).

Confirming the likelihood of bad wiring is the message:

"Uncanceled Echo: 17.7 dB Suspicious - check phone filters and alarm"

This means that a lot of the transmitted DSL signal is being reflected back to the modem (and this means that transmit power is lost before it got anywhere near the CO).

I would strongly suggest to do some testing at the NID because those statistics point at bad inside wiring as the most likely cause. Chances are an external POTS splitter and a dedicated twisted pair cable to the modem will clear up the reflected signal (echo).
--
Got some spare cpu cycles ? Join Team Helix or Team Starfire!


eggonlea

join:2012-12-16
Cupertino, CA

Re: Poor down/up rate... [Update: Solved]

The engineer found the connection at AT&T MPOE is rotted and rusty. He cleaned up all of them (outside and inside) and now the speed is back t 7Mbps/1.xMbps. Hope the rainy days won't impact it again.

Sonic.net made a good job for their quick response and effective action!


eggonlea

join:2012-12-16
Cupertino, CA

1 edit
reply to eggonlea

Re: Poor down/up rate...[Update: Solved]

new status:

DSL Details

Modem Type: Built in modem - ADSL
DSL Line Line 1 (inner pair)
Down Up
Rate: 7040 kbs 1244 kbs
Max Rate: 7668 kbs 1324 kbs
Noise Margin: 6.2 dB 6.1 dB
Attenuation: 39.0 dB 23.2 dB
Output Power: 0.0 dBm 12.1 dBm

Protocol: G.DMT2 Annex A
Channel: Interleaved
DSLAM Vendor Information Country: {46336} Vendor: {IFTN} Specific: {29125 }
ATM PVC: 0/35

Rate Cap: 0 kbs
Attenuation @ 300kHz: 35.1 dB
Required Impulse Noise Protection: 0
Uncanceled Echo: -15.2 dB Ok
VCXO Frequency Offset: 0.0 ppm Ok
Final Receive Gain: 24.0 dB Ok
Excessive Impulse Noise: 0 Ok