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Standard User PaulJC
(newbie) Sun 23-Jan-11 11:28:03
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BT Business Broadband


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Hi,

I have BT Business Broadband and it was great about a year or two ago, but now the speed is all over the place. If I test I can get results from 2 to 15 mb. When I download a file around 6mb seems to be about normal.We are about 500 meters from the exchange which I understand has ADSL2 so upto 20mb is possible.

What should I do please to try and get back to a steady 18-20meg like we used to get? The ping is also all over the place 60 to about 600 in test. Router stats are as follows. It is a 2wire


Broadband Link Type: Built in modem - ADSL
Connection Type: PPPoA
User Name:
Current Internet Connection:
IP Address: Subnet Mask: 255.255.255.255
Default Gateway: 217.32.147.0
Primary DNS: 62.6.40.178
Secondary DNS: 194.72.9.38
Host Name:
Domain:
MAC Address: --:--:--:--:--:--
MTU: 1458


Modem Type: Built in modem - ADSL
DSL Line (Wire Pair): Line 1 (inner pair)
Current DSL Connection:
Down Up
Rate: 14333 kbs 1153 kbs
Max Rate: 23345 kbs 1153 kbs
Noise Margin: 17.1 dB 6.2 dB
Attenuation: 14.9 dB 5.9 dB
Output Power: 18.5 dBm 11.2 dBm


Protocol: G.DMT2+ Annex A
Channel: Interleaved
DSLAM Vendor Information Country: {46336} Vendor: {IFTN} Specific: {47473 }
ATM PVC: 0/38


Rate Cap: 23345 kbs
Attenuation @ 300kHz: 14.9 dB
Uncanceled Echo: -21.2 dB Ok
VCXO Frequency Offset: -8.0 ppm Ok
Final Receive Gain: -4.1 dB Ok
Impulse Noise Comp. Tones: 0 Ok
Excessive Impulse Noise: 0 Ok

Thanks in advance Paul
Standard User yarwell
(sensei) Sun 23-Jan-11 11:57:30
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Re: BT Business Broadband


[re: PaulJC] [link to this post]
 
you're in the wrong bit really, but as I've started.....

If you restart the router does the noise margin stay that high - it was 17.1 which explains the diff between the max 23M and actual 14M downstream

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Are your kids pirates ? Limewire, Bearshare, Kazaa, BitTorrent, eMule are all tools of the trade.
Standard User PaulJC
(newbie) Sun 23-Jan-11 13:57:01
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Re: BT Business Broadband


[re: yarwell] [link to this post]
 
Thanks for your reply. Sorry about posting in the wrong area.

i have rebooted the router several times over the last 2 weeks and the Noise margin is normally around 16db-17bd.

Does this indicate an internal wiring issue?

What would be a better noise margin number please?

Paul


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Standard User RobertoS
(sensei) Sun 23-Jan-11 14:19:02
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Re: BT Business Broadband


[re: PaulJC] [link to this post]
 
If you have a fixed IP Address from BT then it would be useful to set up a thinkbroadband Broadband Quality Monitor. That will give useful info about your line even when you aren't using it.

Don't worry about the time-scale at the bottom if it seems wonky for the first 24 hours, the graph pattern should still be valid.

Re the noise margin, yarwell is probably better equipped than me to help, as you appear to have an on-going fault of some sort.

What you can do just to help your understanding is read this description of the basic noise margin mechanism, and this page for ways in which it can get messed up like yours.

There is a new way of getting it lowered quickly which I haven't included in there yet, but it is pointless your doing that until the fault is cleared.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - O2 Standard.
Standard User yarwell
(sensei) Sun 23-Jan-11 15:15:54
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Re: BT Business Broadband


[re: PaulJC] [link to this post]
 
the noise margin is initially set to a target value of 6 dB, if the line is unstable this can be increased to 9,12 and 15 dB with corresponding speed reductions.

The 2wire shows training history at http://172.16.0.1/xslt?PAGE=C_5_3 (may need to change IP address) - does it retrain often or only if you reboot it ?

Describe your wiring and filtering arrangements plse.

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Are your kids pirates ? Limewire, Bearshare, Kazaa, BitTorrent, eMule are all tools of the trade.
Standard User PaulJC
(newbie) Sun 23-Jan-11 16:15:38
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Re: BT Business Broadband


[re: yarwell] [link to this post]
 
Thanks for your help this far.

This is what has happened with my setup so far...

I had the router plugged in the phone line via an extenstion socket mounted on the wall about 25ft from the master socket. I have new filters from bt one of which was deployed with our fax machine plugged in to same filter as router.

As we started to get lose of connection i decided to move the router and plug into the master socket. The master socket is one with 2 connection sockets. I pluged the filter in then the route and also plugged the exention lead into the filter to alow the fax at the back of the office to work.

The small cupboard that now houses the router also contains a pbx, a 16 socket switch and a power socket for our external sign. All this is in quite a small space. The pbx also has attached some strange thing marked as Grounding or Earth or somthing like that. when i turned it off the telephoneline goes down so i guess the pbx needs it.

My firstt thought is just to unplug the extention lead to the fax machine. Also the router does sit on the switch.

I would like to setup your line monitor but i do not have a fixed ip
Standard User PaulJC
(newbie) Sun 23-Jan-11 16:33:20
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Re: BT Business Broadband


[re: PaulJC] [link to this post]
 
Sorry Phil, I meant to include


training History
Downstream Upstream
Time Line Rate Max1 Max2 Max3 Mgn1 Mgn2 Attn Pwr CRCs FECs INP DLY Rate Max Mgn Attn Pwr CRCs FECs Mode Vendor State Exit Code Echo VCXO Rx Gain INC Tones
2011/01/22 11:51:38 GMT 1 0 0 0 0 0.0 0.0 14.9 0.0 0 0 0.00 0.00 0 0 0.0 5.9 0.0 0 0 G.DMT2+ Annex A Infineon 223/93 ERR_INCONSISTENT_SIGNAL -22.2 -8.0 -4.1 0
2011/01/23 16:20:47 GMT 1 14333 23469 23369 23369 17.0 16.9 14.9 18.4 0 91 1.44 3.82 1153 1152 6.3 5.9 11.2 1 4 G.DMT2+ Annex A Infineon 236/104 N/A -21.2 -8.0 -4.1 0
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