I am upgrading a 5 user remote site from stand alone DSL to T1 P-to_P to regional HQ. I am deciding between a 2811 w/a Switch or a 2821 with a T1 module and Ethernet modules. I'd like to know which way to go, esp. cost wise and parts# needed. Thnx a mil.
If you're forced to chose between the 2811 vs. 2821, not a huge difference in performance. The 2821 offers about 41% more forwarding performance, but in absolute terms it's 170 Kpps vs 120 Kpps (64 byte packets). I.e., either could be inadequate for even a single 100 Mbps, although fine for a couple or several T1s.
The 2821 does come with gig Ethernet interface, again not very useful with its low forwarding performance, but it also supports a NME-X module.
If money isn't an object, go with the 2821 to have a bit more capacity. If money is tight, go with the 2811 unless you know for sure you need the 2821.
You can get a 1861, does voip/CME/SRTS and all the stuff plus it has 8 nice PoE ports.
Sometime you may want to be the one that shows others how to spend money wisely.