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Standard User Ignitionnet
(knowledge is power) Wed 31-Jul-13 19:44:49
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Re: Which tester is most accurate for FTTC line profile?


[re: yarwell] [link to this post]
 
In reply to a post by yarwell:
or maybe Apple don't comply with the standards so the PPPoE negotiation doesn't send the linespeed upstream.


Line speed isn't a part of the PPPoE negotiation, that bit of information comes from a RADIUS attribute.
Standard User yarwell
(sensei) Wed 31-Jul-13 21:16:39
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Re: Which tester is most accurate for FTTC line profile?


[re: Ignitionnet] [link to this post]
 
line speed is sent upstream as part of the PPP negotiation....

Unlike other WBC access technologies, WBC FTTC accesses use the PPP (“Point-to-Point Protocol”) session establishment to inform the BT Wholesale BRAS of the Openreach line rate. It is therefore essential that the PPP session is re-started every time the VDSL line retrains. To ensure this, the PPP / L2TP timeout values must be set to less than 20 seconds.


to become a RADIUS attrribute it has to get there. If Openreach tag it on with the DSLAM and the PPP data isn't compliant I could see how it would fail. Or maybe the airport hangs on for a long time with its ppp session.

It was just a thought.

--

Phil

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

MaxDSL diagnostics
Standard User ryant704
(member) Thu 01-Aug-13 12:53:50
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Re: Which tester is most accurate for FTTC line profile?


[re: RobertoS] [link to this post]
 
The second link is your Sync speed, you IPP profile is always than your sync speed unless you have a bRAS mismatch.

Not directed at you Rob.

@Stephen The HomeHub has all the details they're just locked, also BT can access the modem anyway to get the stats.

Edited by ryant704 (Thu 01-Aug-13 12:57:08)


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Standard User XRaySpeX
(eat-sleep-adslguide) Thu 01-Aug-13 13:52:06
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Re: Which tester is most accurate for FTTC line profile?


[re: ryant704] [link to this post]
 
EDIT:
In reply to a post by ryant704:
IPP profile is always less than your sync speed


1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC
Standard User RobertoS
(sensei) Thu 01-Aug-13 15:33:56
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Re: Which tester is most accurate for FTTC line profile?


[re: ryant704] [link to this post]
 
Every post has its own Reply button smile. That's how threaded forums work, and these forums have threading. Try clicking the Threaded button.

Even in Flat mode the headers show the person replied to, and the link to the post.

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 51.8/16.8Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Standard User Ignitionnet
(knowledge is power) Thu 01-Aug-13 21:15:34
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Re: Which tester is most accurate for FTTC line profile?


[re: yarwell] [link to this post]
 
Okay I see - I thought you were talking about the Airport sending the line rate upstream.

The only visibility the Airport or any other end user device can have of line rate is it being sent as part of RADIUS attributes or DHCP options. The Openreach equipment inserts line rate information as either a DHCP option or PPPoE Active Discovery Initiation.

The Openreach kit also removes tags sent from CP to equipment and removes anything in DHCP option 82. It doesn't really care what the CPE or CPE have to say smile

PPP timeout being higher than the time it takes to complete a retrain would stuff things, though, always.
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