What is "normal"?

Connection issues, drop outs or speed related faults for ADSL and ADSL2+ services
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nylon
Posts: 24
Joined: Mon Oct 27, 2008 11:10 am
Location: Melbourne

What is "normal"?

Post by nylon » Fri Jul 03, 2009 2:01 am

Hi all. I've been trying to diagnose my very sluggish naked ADSL2+ speed and although I work in IT, the jargon such as Attenuation rate etc baffles me. Is there a guide to what is considered fast, normal or slow for different DSL modes?

Also, my NB6 modem reports my line mode is G.DMT (I use ADSL2+) - is this normal? Should it read ADSL2+? I've got ADSL2+ checked in my modem's DSL modes, so it's available if the modem asks for it.

Am I being shaped by Telstra?

I'm really getting annoyed by slow ADSL2+ speeds. My line died completely about a month ago and was fixed by Telstra: bad connection in one of those concrete pillars down the road, apparently.

After that, speeds were pathetic. At 1Mbps max, I might as well drop down my plan to plain ADSL2, or even dialup at some times - or even carrier pigeon. I'm starting to regret giving up my Optus cable internet plan.

The stats:

Statistics Downstream Upstream
Line Rate 1504 Kbps 256 Kbps
Attainable Line Rate 9888 Kbps 928 Kbps
Noise Margin 33.0 dB 30.0 dB
Line Attenuation 26.0 dB 14.0 dB
Output Power 17.2 dBm 11.9 dBm
K (number of bytes in DMT frame) 48 9
R (number of check bytes in RS code word) 16 4
S (RS code word size in DMT frame) 2 4
D (interleave depth) 16 2
Super Frames 105137 105137
Super Frame Errors 0 0
RS Words 3574670 1785323
RS Correctable Errors 0 0
RS Uncorrectable Errors 0 0
HEC Errors 0 0
OCD Errors 0 0
LCD Errors 0 0
Total Cells 6340075 0
Data Cells 915555 0
Bit Errors 0 0
Total ES 0 0
Total SES 0 0
Total UAS 141 0


>ping 220.233.0.50

Pinging 220.233.0.50 with 32 bytes of data:
Reply from 220.233.0.50: bytes=32 time=46ms TTL=61
Reply from 220.233.0.50: bytes=32 time=38ms TTL=61
Reply from 220.233.0.50: bytes=32 time=38ms TTL=61
Reply from 220.233.0.50: bytes=32 time=43ms TTL=61

Ping statistics for 220.233.0.50:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 38ms, Maximum = 46ms, Average = 41ms



tracert www.telstra.com

Tracing route to www.telstra.com [144.140.108.23]
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms NB6.home [192.168.1.1]
2 28 ms 30 ms 41 ms 209.2.96.58.static.exetel.com.au
[58.96.2.209]
3 30 ms 30 ms 29 ms 3.2.96.58.static.exetel.com.au [58.96.2.3]
4 165 ms 223 ms 211 ms vlan202.33bhc76f000.optus.net.au
[59.154.44.77]

5 43 ms 45 ms 43 ms xe-4-1-0-3927.md22.optus.net.au
[61.88.243.103]

6 44 ms 47 ms 44 ms
GigabitEthernet4-5.lon42.Melbourne.telstra.net [
139.130.96.89]
7 50 ms 42 ms 44 ms
TenGigabitEthernet8-1.exi1.Melbourne.telstra.net
[203.50.80.11]
8 44 ms 44 ms 43 ms telstr310.lnk.telstra.net [139.130.36.186]
9 42 ms 44 ms 45 ms 144.140.109.252
10 * * * Request timed out.
11 * * * Request timed out.
12 * * * Request timed out.
13 * * * Request timed out.
14 * * * Request timed out.
15 * * * Request timed out.
16 * * ^C


Many thanks to anyone with a clue what to do next. I've logged a ticket with Exetel, reset the modem umpteen times, checked DNS settings, swapped cables, slaughtered chickens upon the sacred altar of the god of broadband. Nothing helps.

JasonM

Re: What is "normal"?

Post by JasonM » Fri Jul 03, 2009 9:18 am

A stability profile was applied to try and restore service as a troubleshooting measure.

I've removed this, and the service should sync faster now.

nylon
Posts: 24
Joined: Mon Oct 27, 2008 11:10 am
Location: Melbourne

Re: What is "normal"?

Post by nylon » Fri Jul 03, 2009 10:05 am

Now 2071.3 kbps...

Thanks for that. Not exactly ADSL2+ speed but certainly better than the near-dialup speed I was experiencing ;-)

Cheers
Mark

ymo
Posts: 295
Joined: Sat Sep 10, 2005 4:36 pm
Location: Wollongong NSW

Re: What is "normal"?

Post by ymo » Fri Jul 03, 2009 5:58 pm

nylon wrote: Statistics Downstream Upstream
Line Rate 1504 Kbps 256 Kbps
Attainable Line Rate 9888 Kbps 928 Kbps
Noise Margin 33.0 dB 30.0 dB
Line Attenuation 26.0 dB 14.0 dB
What have these figures changed to since the stability profile was removed?

nylon
Posts: 24
Joined: Mon Oct 27, 2008 11:10 am
Location: Melbourne

Re: What is "normal"?

Post by nylon » Sat Jul 04, 2009 4:18 pm

Statistics Downstream Upstream
Line Rate 14538 Kbps 741 Kbps
Attainable Line Rate 16084 Kbps 856 Kbps
Noise Margin 10.9 dB 13.0 dB
Line Attenuation 30.0 dB 13.8 dB
Output Power 1.3 dBm 12.6 dBm
MSGC (number of bytes in overhead channel message) 54 122
B (number of bytes in Mux Data Frame) 246 13
M (number of Mux Data Frames in FEC Data Frame) 1 16
T (Mux Data Frames over sync bytes) 2 1
R (number of check bytes in FEC Data Frame) 8 16
S (ratio of FEC over PMD Data Frame length) 0.5426 8.9720
L (number of bits in PMD Data Frame) 3760 214
D (interleave depth) 64 2
Delay 8 4
Super Frames 6843640 6552485
Super Frame Errors 477 0
RS Words 821236822 2324908
RS Correctable Errors 4271308 2
RS Uncorrectable Errors 8597 0
HEC Errors 406 0
OCD Errors 1 0
LCD Errors 0 0
Total Cells 3819507598 195013257
Data Cells 178274170 173820547
Bit Errors 0 0
Total ES 332 4
Total SES 1 0
Total UAS 161 0

---

CoreyPlover
Volunteer Site Admin
Posts: 5922
Joined: Sat Nov 04, 2006 2:24 pm
Location: Melbourne, VIC

Re: What is "normal"?

Post by CoreyPlover » Sat Jul 04, 2009 9:16 pm

Those sync stats look great now, well above average. Have you tried a few different speed tests? I find that http://speedtest.net works best for me.

nylon
Posts: 24
Joined: Mon Oct 27, 2008 11:10 am
Location: Melbourne

Re: What is "normal"?

Post by nylon » Sun Jul 05, 2009 9:32 am

This morning (9:31am) I got:

Image

but it does seem to fluctuate quite a bit depending on mysterious factors.

CoreyPlover
Volunteer Site Admin
Posts: 5922
Joined: Sat Nov 04, 2006 2:24 pm
Location: Melbourne, VIC

Re: What is "normal"?

Post by CoreyPlover » Sun Jul 05, 2009 11:29 am

nylon wrote:but it does seem to fluctuate quite a bit depending on mysterious factors.
Yeah. It will do that at high speeds. My connection (which average about 8-9Mbps) fluctuates between 6 & 12Mbps in speed tests.

JanetNCarl
Posts: 3
Joined: Sat Mar 28, 2009 9:16 am
Location: St Clair, NSW

Re: What is "normal"?

Post by JanetNCarl » Fri Jul 10, 2009 8:52 pm

JasonM wrote:A stability profile was applied to try and restore service as a troubleshooting measure.

I've removed this, and the service should sync faster now.


Hi Jason!

a while back you also gave us a stability profile and since then we hardly get 6000/nnn speeds and we only get the following:DSL Status: UP
DSL Modulation Mode: G.992.5 (ADSL2+)
DSL Path Mode: INTERLEAVED
Downstream Rate: 1472 Kbps
Upstream Rate: 256 Kbps
Downstream Margin: 25 db
Upstream Margin: 26 db
Downstream Line Attenuation: 51
Upstream Line Attenuation: 31
Downstream Transmit Power: 16
Upstream Transmit Power: 12
LOS Errors: 1
PVC Connection

PVC Status: UP
Encapsulation: RFC 2516 PPPoE
Multiplexing: LLC
Autodetect: Enable
VPI: 8
VCI: 35


our current plan:Plan Type: NONPHONE B
Monthly Access Charge: $60.00
Peak Download Limit (Mbyte): 30000
Peak Period Option: 12:00pm - 12:00am
Excess Downloads per Gbyte: $6.00
OffPeak Download Limit (Mbyte): 54000
OffPeak Excess Downloads per Gbyte: $6.00
Service Line Speed: 18000/900

Between 18000/900 ideal speed we only get steady and constant 1472/256 ??? and we still get occasional dropouts and poor VOiP quality at times.

cheers

CoreyPlover
Volunteer Site Admin
Posts: 5922
Joined: Sat Nov 04, 2006 2:24 pm
Location: Melbourne, VIC

Re: What is "normal"?

Post by CoreyPlover » Sat Jul 11, 2009 12:28 am

JanetNCarl wrote:a while back you also gave us a stability profile and since then we hardly get 6000/nnn speeds and we only get the following...
Downstream Rate: 1472 Kbps
Upstream Rate: 256 Kbps
That is what a "stability profile" is: A 1.5Mbps overlay that is used to see whether the service continues to drop out.

Downstream attenuation of 51dB indicates a very noisy line. You can try having the stability profile removed but you risk having even more frequent drop outs. ADSL is all about balance between noise levels and speed levels: The noisier the line, the slower the speed needs to be to ensure a constant connections.

If you want faster speeds, you can email residentialsupport@exetel.com.au for them to remove the profile, but since you are still experiencing drop outs I think this would only make things much worse in terms of stability. I think you should email residentialsupport@exetel.com.au, quoting any previous ticket that you have received, and state that you are still having drop outs issues on a 1.5Mbps stability profile. They may run some line tests or escalate the issue to the carrier for further investigation.

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