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158 posts

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  Reply # 1557135 22-May-2016 09:45
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sbiddle:

 

It's very easy to guarantee voice quality over xDSL - just deploy EUBA with a CIR component such as EUBA192. The sole purpose of this product originally was going to be for Telecom's PSTN replacement project.

 

 

Deploying EUBA with a CIR component does nothing to protect from intermittent packet loss due to electrical artefacts on the line causing micro-outage style interference, and hence does not 'guarantee' voice quality. We're talking about two different things. You're talking about a guarantee that the necessary amount of bandwidth is available from the ISP to the PoP DSLAM via the Chorus backbone. I'm talking about the inherent nature of DSL's susceptibility to external influences on the line that the end user is unable to address.

 

 

 

sbiddle:

 

Fibre also doesn't guarantee voice quality unless you're on a HSNS connection where both ends of the connection are fully managed and queued or you're using the CIR component of a UFB connection and using appropriate 802.1p tagging and your voice service is with the internet provider as I can't imagine there will be any who will tag traffic from outside their own network.

 

 

I totally accept that UFB provides no additional guarantees for transit across the LFC network. The point I was making is that fibre is not susceptible to the myriad of electrical interference effects that DSL is and because of this it is, in the real world, far far more reliable than DSL for VoIP.

 

 


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  Reply # 1557152 22-May-2016 09:56
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speed:

 

Deploying EUBA with a CIR component does nothing to protect from intermittent packet loss due to electrical artefacts on the line causing micro-outage style interference, and hence does not 'guarantee' voice quality.

 

 

Which in itself is a very small scale issue. Yes it can happen, but it's not the big issue you make it to be. If it was you'd see thousands of complaints from customers of mass market RSP's such as Orcon and 2degrees who rely on VOIP over xDSL as their PVL.

 

 


158 posts

Master Geek
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  Reply # 1557168 22-May-2016 10:23
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sbiddle:

 

Which in itself is a very small scale issue. Yes it can happen, but it's not the big issue you make it to be. If it was you'd see thousands of complaints from customers of mass market RSP's such as Orcon and 2degrees who rely on VOIP over xDSL as their PVL.

 

 

I never made out that it was a big or widespread issue. Please go back and re-read my posting. I simply pointed out that due to it's complexity, it is almost magical to me that the technology works. I also said that due to the attributes these technical limitations our company has a policy to never deploy VoIP over DSL (because having just one customer with these issues would be one too many for us).

 

I stand by both those statements and also the opinion that if the OP wants guaranteed quality he is best served by PoTS.

 

Each to their own & and we're all entitled to our own opinion. Perhaps you read a little too much into mine.

 

 


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  Reply # 1557665 23-May-2016 08:09
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I disagree about not deploying VoIP over dsl. Unless it isn't the core business, that simply cuts out a large amount of customers in NZ. But, if it isn't the core business, then I can understand not wanting the head aches. I am currently dealing with an issue that is related to micro-outages with a particular customer and it is dam annoying. However, chorus have changed cable pairs for us and so far it is looking good - not exaxtly a massive issue.
I think in the OP's case, he has an avergae connection. It's not terrible, but it's not fantastic. And the issue he speaks of sound bandwidth related. Luckily his VoIP and broadband service is with the same provider and, as such, has the ability to do something about it.

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  Reply # 1557680 23-May-2016 08:33
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What codec are you using on the phone? Even over ADSL I found g711a gives a fairly good call quality, vs g729, but could be worth experimenting

 

 


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