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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!

Interleaving: Difference between revisions

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==Availability==
*BT 21CN Lines
*TT lines - via [[TalkTalk_Wholesale_Line_ProfilesTalkTalk Wholesale Line Profiles|Adjusting the profile]]
 
==Interleaving Options==
The downside is that, whilst the overall speed is the same, interleaving adds latency. Typically around 8ms is added to all communications on the line, though there are different levels of interleaving (or Impulse Noise Protection) which cause even higher latency. The latency added is however consistent, which can, in itself, be an important factor for on-line games.
 
This is a slight challenge: with interleaving the line has extra latency all the time, but without it you get errors. When there is an error then the packet has to be resent, which adds a lot more latency but randomly and inconsistently. Usually interleaving is a better choice, but it does depend inon the interference. In some cases interference is only at certain times of day, and if that is not when you are playing, then interleaving is best turned off.
 
There is often one other option, which is running the line at a lower speed. This can remove the interference if it is only at certain frequencies, and as we explained above, the speed is not necessarily a key factor.
 
== Good or bad? ==
Interleaving on lines where it can reduce errors can be a good thing for applications such as VoIP.
 
Gamers will want to reduce the latency as much as possible.
 
On a good quality line there should be no need for interleaving, but a longer line may benefit from it.
 
Errors on lines is usually a problem that needs to be fixed. Masking a fault by enabling interleaving may help, but it may be better to get to the root cause of the errors.
 
== TalkTalk lines ==
The interleaving is set whenby selecting the line profile, see: [[TalkTalk_Wholesale_Line_ProfilesTalkTalk Wholesale Line Profiles|Adjusting the profile]]
 
==FTTC==
Interleaving on a VDSL/FTTC line is managed by Openreach. It is very hard for us to persuade BT or TalkTalk to disable or enable interleaving as this requires an engineer visit and a DLM reset. This is not a service they offer. VDSL comes with interleaving automatically managed by Openreach and there is no option for us to request changes. Both BT and TalkTalk are highly reluctant for us to specifically report a fault to disable interleaving. Please do discuss this with Support, but manually disabling interleaving is not really possible.
Controlling interleaving on a BT FTTC line is done by Openreach. It is quite hard for us to persuade BT to disable or enable interleaving. We can try though, so do ask.
 
[[Category:Line Profiles]]
[[Category:Line_SettingsLine Settings]]
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