What bandwidth is required for effective SCCM deployment of WIndows 7?

BStormC
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I am looking to find out the bandwidth that is needed to deploy Windows 7 using SCCM 2007 over a WAN as I am looking to avoid putting a distribution server at a remote site for thirty users.  Let me know if you have any questions.  Does anyone know the required bandwidth?  Documentation/links will be great.
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There is no bandwidth throttling available between the client downloading the OS image and the distribution point hosting the image.  Therefore just like a large file copy (which is really what this is), the client will consume as much bandwidth as the network will give it until it has the whole image.  There isn't really a "minimum" bandwidth requirement since the process will quite happily clog the WAN until it has the whole image file so that it can reboot and deploy the new OS to itself.

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Commented:
Let me add a question...I am seeing some recommendations to have a local server at a site with as low as 4 users.  That seems like overkill.  Does anyone have any further points on this point?
In my current project we are using Distribution Points when there are more than 40 Users in a Location.
We do not use Branch Distribution Points as they are longer available in Configmgr 2012 so that we have n o migration issue.
For locations with less than 40 Clients we plan to use the Windows 7 Branch Cache Feature. Unfortunately this feature does not work when deploying an OS Image, but its very useful when deploying updates or software packages.

Note that there are to things when deploying os.
1. The Windows PE boot image must be loaded from a PXE Service Point
-> This can be avoided if you use a Boot Media like USB Flash Drive, DVD...
2. The Windows 7 Image must be downloaded
->  This can be avioded when using a Standalone media

It's up to you in which location you place a Server System as its just a question of the costs

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Thanks all.

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