Poor Sync speeds after adsl2+ upgrade

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bronzeblood

6 posts

Wannabe Geek

Topic # 82837 6-May-2011 10:18

After Ringing several time telling slingshot that the exchange im connected to has been adsl2+ upgraded and im still on adsl1 they finally got a tech to switch me over to adsl2+ (excellent!).

However im only getting slightly higher sync speeds. Actually only 1 sync speed, a constant 8155kbps!
Which is still only 5kbps off the max adsl1 speed. With my adsl1 connection i used to sync at around 7600-7900kbps. Im approx 900m -1100m from the exchange. I have rung 3 times now telling them there is a problem but they just say "try another jack , or filter" Which of course i have i'm not stupid. I have also tried 3 other modems, same sync speed!. My current modem is a dlink 504t with routertech firmware. Stats as follows...

Router Stats Logger v1.0.29 report - 06 May 2011 09:40:18
Last boot: 06-May-11 9:28:00 AM
DS rate: 8155 kbit/s
US rate: 991 kbit/s
Max DS rate: 11372 kbit/s
Max US rate: 991 kbit/s
DS SNR: 17 dB
US SNR: 12 dB
DS Attn: 22 dB
US Attn: 15 dB
DS Power: 21 dB
US Power: 12 dB
Mode: Fastpath ADSL 2+
ATM Driver version:[7.05.01.00]
DSL HAL version: [7.05.01.00]
DSP Datapump version: [7.05.01.00] Annex A
SAR HAL version: [01.07.2c]
PDSP Firmware version:[0.54]
Chipset ID: [Ohio250(7200/7100A2)]
SNR Margin Threshold: 6 dB
Bit Allocation per Bin gaps:
Gap 1 = 0.000 - 30.188 kHz - Voice & guard band
Gap 2 = 138.000 - 155.250 kHz - Guard band between US and DS
Gap 3 = 728.813 - 733.125 kHz
Gap 4 = 1,026.375 - 1,030.688 kHz
Gap 5 = 2,130.375 - 2,203.688 kHz
SNR downstream power spectrum gaps:
Gap 1 = 0.000 - 155.250 kHz - Voice & US
Gap 2 = 728.813 - 733.125 kHz
Gap 3 = 1,026.375 - 1,030.688 kHz
Gap 4 = 2,130.375 - 2,203.688 kHz

As far as my knowledge goes my attenuation is very good and my SNR margin allows for quite a bit higher sync then 8155.

Hope somebody can help me out here.

Thanks!

NZCrusader

646 posts

Ultimate Geek
+1 received by user: 228

Reply # 466215 6-May-2011 14:23

1: Call the helpdesk using a cell ph. Try turning interleaving on.

2: If that doesnt solve the issue. Try a different modem.

3: Ask if they can try modifying your profile.

4: If all fails, it may be a bad line and chorus may need to be called.

NZ / AU Battlefield 4 Gaming Community
http://www.sonsofvalour.net/forums/forum.php

hellonearthisman

1816 posts

Uber Geek
+1 received by user: 51

Trusted

Reply # 466217 6-May-2011 14:26

This setting settings seem wrong?

DSP Datapump version: [7.05.01.00] Annex A

Shouldn't it be Annex M for adsl2+

bronzeblood

6 posts

Wannabe Geek

Reply # 466224 6-May-2011 14:56

Nz doesnt have annex m do they ? Or did i hear there new vdsl2 dslams are backwards compatible with adsl2+ annex m?

Help desk are no help they just blame the line even when it has fairly good attenuation and snr margin.

Ill try ask for a port reset and interleaving turned on. Might fix the misconfiguration there is .

webwat

1901 posts

Uber Geek
+1 received by user: 120

Trusted

Reply # 466230 6-May-2011 15:00

Nope, Annex M reduces the downstream speed to give a higher upstream, and I don't think its available in NZ because telecom would have to allow it since it has potential for higher FEXT crosstalk with other users. Slingshot probably had to wait for telecom to setup the ADSL2 profiles, since they don't always do it straight away if they are testing etc.

Your modem says noise margin is 17dB, so it might sync to 11 megs if you restart the modem. The fact you have had stable speed with a high noise margin is a good sign and means you probably don't need interleaving or any house wiring improvements. I do agree that its worth trying a different modem if this one never syncs over 8Mbps, but I suspect it would be much slower if there was a modem fault.

Check the house wiring and possibly install a master filter if you notice the speed or noise margin is quite variable for a while after a restart, but ADSL2+ does slow down automatically if there are noise problems.

Qualified in business, certified in fibre, stuck in copper, have to keep going ^_^

bronzeblood

6 posts

Wannabe Geek

Reply # 466234 6-May-2011 15:04

House was wired up approx 6 months ago, as its a flat which is connected to the main house, separate phone line though. Checked the line as far as i could under the house seems fine. approx only 10m to the phone post in the ground.

I have 3 other modems here all sync the same.

a dlink 502t
a thompson (telecom provided one)
a Netcomm n150

Something is up for sure.

hellonearthisman

1816 posts

Uber Geek
+1 received by user: 51

Trusted

Reply # 466257 6-May-2011 16:16

Slingshot LLU supports Annex M
Downstream Rate: 10615 kbps
Upstream Rate: 1408 kbps

To the OP, keep at them you should be getting better than adsl 1 speeds

bronzeblood

6 posts

Wannabe Geek

Reply # 466262 6-May-2011 16:32

Yeah , This is the 3rd time iv had problems . Iv apparantly had 2 dud ports up at the exchange and chorus has fixed it pretty quickly but i'm a bit hesitant this time , just dont want a bill from chorus if there is nothing wrong (im fairly sure there is at the exchange end).

I would expect a lot faster, as i was connecting at 90% the maximum adsl1 speed so would expect a bit of an increase with going to adsl2+ instead of the current 400 kbps increase .