[THIN] Citrix Farm across WAN design query

Hi

I currently manage 2 separate CPS 4 farms in different countries.  Each country has its own infrastructure and are completely separate.  Each country has CSG, Web Interface, ZDC and Presentation Servers.  Im looking at upgrading to Windows 2008/XenApp5 and am looking at creating 1 farm for both countries.  Both countries are connected with a 2Mb Frame Relay Link but we are happy to upgrade the link to make the solution work.  If we have all backend infrastructure in the Head Office (CSG, Web Interface, Presentation Server, ZDC), would there be issues if the other country utilised the same infrastructure or would it be recommended to have some Infrastructure at the second site?  If so what Infrastructure would be required in Site 2?  Eg ZDC, Print Servers etc etc

We currently have 20 Citrix Presentation Servers.  Any assistance in achieving this design would be appreciated.

Thanks
Angela

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