Hey, I think either Frame-relay or ATM will be most cost effective for you, while providing the service you need. Both support quality of service on a per-pvc basis, so you'll be able to guarantee citrix traffic going over the network, as well as voice if you're running VoIP.
What will probably make the decision in this case is the available carriers. Often times they only do ATM, or only do Frame, or they'll do ATM at the hub site and frame on the remote sites.
At this point i would figure out all of the different frame/atm carriers in the area, and tell them what speed PVCs you need (make sure they give can you guaranteed CIR's, instead of 0 cir circuits), and compare the prices they come back with.
When you buy a PVC from the frame-relay provider, usually they sell you the PVC bandwidth, not the link bandwidth. Remember that your hub site will be configured for every PVC that goes to a remote site.
In the case of 64MB PVCs, you'll get 64k fractional T1's at your remote sites, and a 1024k fractional T1 at your hub site.
Make sure the sum of your PVC's bandwidths are less than or equal to the physical link speed, that way you can guarantee bandwidth to applications at Layer2.
MPLS is also a good option, especially in the case that you're transporting data traffic only.
When you bring voice into the mix, though, careful design considerations need to be taken to ensure that you aren't shooting too much bandwidth from one site to another, making your voice susceptible to drop in the cloud.
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