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Standard User PeterLondon
(newbie) Thu 03-Apr-14 17:27:54
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Max users on ADSL2+ line at 12Mbps


[link to this post]
 
Bit of a daft question perhaps.

We have a 40Mbps fibre line at work, with 200 users - mainly just surfing the web and email etc.

We need a fall-over system if the fibre line goes down; and we can only get regular business ADSL2+ with a download of around 12Mbps and upload of around 0.8Mbps. We would use PlusNet or such like.

If we needed to switch to the ADSL2+, we would tell all users to be careful and just surf the web and send small emails until the issue is fixed.

Could the ADSL2+ handle this emergency situation for a short while? All I want folks to be able to do is surf the web, even just slowly, and send/receive emails, again, slow is fine.

Thanks for your help.
Administrator MrSaffron
(staff) Thu 03-Apr-14 17:40:27
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Re: Max users on ADSL2+ line at 12Mbps


[re: PeterLondon] [link to this post]
 
Assuming people don't mind their content appearing a little slower then no reason that 200 could not be supported. Obviously a standard consumer router will not be up to the task of handling NAT routing for 200 people.

The key to it being a workable backup is ensuring people know and that they avoid trying to all watch a sports event as video on their computer screen.

The best guide is to look at the traffic utilisation now for the 40 Mbps line, if usage is only bursting to 40 Mbps occasionally e.g. big PDF opens then no problems. If it is nailed to 40 Mbps all the time then they will notice the drop to 12 Mbps a lot.

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User PeterLondon
(newbie) Thu 03-Apr-14 17:57:21
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Re: Max users on ADSL2+ line at 12Mbps


[re: MrSaffron] [link to this post]
 
Many thanks for your kind advice - I've come to the right place I think!

We have a good Juniper router that we would use, and that will handle the NAT & DHCP etc.

The current use of the line is not maxed-out, this is partly because we use a device from the USA called a NetEqualizer that throttles users back when they start to be naughty. We have a spare one of these, and might use it to manage the ADSL2+ line.

Normal surfing and email uses surprisingly little bandwidth. And again, slow is fine. As long as the user have some sort of connection, they will be OK for a while. And of course with a slow connection, they are less likely to do something that requires a lot of bandwidth.

My concern would be:

1. The ISP would not like to see, nor be able to handle, so many sessions from so many users? But PlusNet told me they would only be able to see the traffic as one session.

2. The ISP would start to throttle the line back when they saw it maxed-out to say 9Mbps for an hour. But note that such usage would only happen from around 11am to 4pm Monday to Friday.

Any thoughts on 1 & 2?

Many thanks once again, you are a star.


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Standard User panda
(committed) Thu 03-Apr-14 17:59:01
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Re: Max users on ADSL2+ line at 12Mbps


[re: PeterLondon] [link to this post]
 
I don't have a simple answer, but some things to consider:

With (very roughly) a third of the bandwidth available, things will take 3 times as long to download. Upstream bandwidth is likely to be very much lower, so uploading will be considerably problematic. Is that acceptable for the duration?

Without knowing the details of your setup (is the 40Mb Fibre connection FTTx/Cable? Or a symetric Leased Line with high availability with robust SLA/SLGs?) the ADSL service may very well follow the same path from the exchange, so both services would be susceptible to a navvy with a JCB if he were to damage the cable/duct as there will be no seperacy between the two services.

If (say) your existing service is FTTC (and so within the same cable as the ADSL service) and this cable was damaged and took several days to repair, what impact would it have on the business? How important is internet access for your work? What will it cost in lost productivity if it were to be lost for a while?

Once you understand the risks and potential financial impact, you can better decide if it's worth paying for a more resilient solution.
Or you may decide the risk of losing both simultaneously is low and the loss if internet access isn't critical for the business, so go with a low cost option.

Eats shoots and leaves.
Standard User b4dger
(knowledge is power) Thu 03-Apr-14 17:59:14
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Re: Max users on ADSL2+ line at 12Mbps


[re: PeterLondon] [link to this post]
 
As MrSaffron says it should work for limited access.

Just out of interest (but may help with your query) can you say what your current monthly or daily bandwidth usage is with 200 users?

Standard User PeterLondon
(newbie) Thu 03-Apr-14 18:05:56
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Re: Max users on ADSL2+ line at 12Mbps


[re: b4dger] [link to this post]
 
Thanks for your help.

Monthly download averages around 2,000GB, so 2TB
Monthly upload averages around 300GB
Standard User PeterLondon
(newbie) Thu 03-Apr-14 18:08:04
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Re: Max users on ADSL2+ line at 12Mbps


[re: panda] [link to this post]
 
Thanks for the sound advice.

You are spot on of course.

We have a true symmetric leased line etc.

So I think the ADSL phone line would be separate.
Administrator MrSaffron
(staff) Thu 03-Apr-14 18:08:53
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Re: Max users on ADSL2+ line at 12Mbps


[re: PeterLondon] [link to this post]
 
1. The sessions is not really an issue to the ISP

2. If you are buying an unlimited service with no fair use policy (no idea what contract you signed says) then they should not care, especially if its just for the odd day or two a year.

Generally daytime is not the peak time for PlusNet, as they have a large consumer base, so absolute peak tends to be actually between 8pm and 11pm i.e. once everyone is at home.

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User PeterLondon
(newbie) Thu 03-Apr-14 18:13:11
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Re: Max users on ADSL2+ line at 12Mbps


[re: MrSaffron] [link to this post]
 
Great.

Would you recommend any particular ISP? Or is that a tricky question around here smile
Standard User Zarjaz
(knowledge is power) Thu 03-Apr-14 18:17:38
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Re: Max users on ADSL2+ line at 12Mbps


[re: PeterLondon] [link to this post]
 
Would an EFM solution be good as a back up ? (There are other providers of this product, that was just the first Google came up with.) A little more expensive, but with higher SLA's, and maybe of more use if it all goes Pete Tong on the FTTC.

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