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curBe

join:2012-11-17
Ithaca, NY

[speed/latency] Speed Decrease

Hi everyone, and thanks in advance.

I have noticed a change in my DSL service lately (11/11 through now).

I've had problems before, both with connectivity and with slow speeds. The speed issue was corrected by a technician, new modem, and a speed upgrade. Connectivity problems were never fixed.

I am paying for a 7 -15 Mbs down.

However lately my service has gone way down hill. Speedtest has gone from ~ 8 mb/s down, ~ 1 mb/s up (sorry do not have a screen shot and I am working form memory), to

.

Router/modem information is:
Westell 7500

Tranceiver info is:
Transceiver Revision A2pB020b3.d20h
Vendor ID Code 4D54
Line Mode ADSL_2plus
Data Path FAST

Transceiver Information Down Stream Path Up Stream Path
DSL Speed (Kbits/Sec) 10471 112
Margin (dB) 6.1 10.0
Line Attenuation (dB) 53.0 60.1
Transmit Power (dBm) 0.0 12.8

Any Suggestions?


Demonfang

join:2011-04-21
Spring Mills, PA
kudos:1
Reviews:
·DSL EXTREME
well i can tell you right now, based on estimated distance from attenuation, you're lucky to have that high of a sync.

looking at your stats, i would recommend you drop to 5mbps or 7Mbps. as is, you line is barely hanging on with a margin of 6.1, and i'm surprised it's working at all.

that said, that is unlikely to fix your upstream issues. provided the technician didn't already do so, i would suggest checking all filters in your house, all the wiring, cords, etc...

if this fails, i would suggest getting a technician out, and telling them to look at the stats of the modem.


NormanS
I gave her time to steal my mind away
Premium,MVM
join:2001-02-14
San Jose, CA
kudos:12
Reviews:
·SONIC.NET
·Pacific Bell - SBC
reply to curBe
said by curBe:

DSL Speed (Kbits/Sec) 10471 112
Margin (dB) 6.1 10.0
Line Attenuation (dB) 53.0 60.1

Any Suggestions?

I concur with Demonfang See Profile about downgrading service. When I got ADSL2+ service on a 9,156 foot loop, my modem (ZTE ZXSDL 830II) reported sync at 5800/500 with down SNR=6.1 dB and down attenuation=51.0 dB. If my ISP charged based on tier/speed profile, it would be a waste of money to pay for more than 5.0 Mbps.
--
Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum


Smith6612
Premium,MVM
join:2008-02-01
North Tonawanda, NY
kudos:24
Reviews:
·Verizon Online DSL
·Frontier Communi..
reply to curBe
Let's focus on the upstream end of the line first before we start messing with the speed. Your upstream is looking awful. If your line is really 13,300ft out it's pretty impressive that you are holding nearly the full 10Mbps sync.

None the less, you have a problem on the upstream. Connect your modem to your NID, bypassing all of your home's wiring and see if you can get some better statistics out there. If your sync rate isn't hitting ~12Mbps down, 1Mbps up, get Verizon out to repair your line. That upstream attenuation should be at least half of where it's at now, and it should also get potentially lower.

curBe

join:2012-11-17
Ithaca, NY
Thanks for the responses!

In the process of checking cables I think the problem has been solved. Although I am not sure what the specific problem was.

I unplugged the line between the modem and phone jack to try a different cable. There was no improvement with the other cable so I replaced the older cable and I am back to normal speeds.

Speedtest:



Transceiver:

Transceiver Revision A2pB020b3.d20h
Vendor ID Code 4D54
Line Mode ADSL_2plus
Data Path FAST

Transceiver Information Down Stream Path Up Stream Path
DSL Speed (Kbits/Sec) 11742 1113
Margin (dB) 10.9 11.0
Line Attenuation (dB) 21.5 9.6
Transmit Power (dBm) 0.0 11.0

I am guessing it was a loose cord? Or maybe the jack/cable contact is bad?

Thanks again!


Demonfang

join:2011-04-21
Spring Mills, PA
kudos:1
Reviews:
·DSL EXTREME
glad you got it fixed. now those stats look a lot better than the first ones. i would say it's probably an issue with the wall jack, as if it was just a loose cable, the second cable you tried would've fixed the issue. i would just recommend replacing the wall jack, as they can be picked up for only a couple bucks.

curBe

join:2012-11-17
Ithaca, NY
I am going to pull the jack out and look at the wiring. Maybe something obvious will pop out.

Thanks for the advice!