Ilya:
1) Could I stack 24 and 48 ports models?
Yes. One item to note is that stacking is done via the front-pane SFP+ ports, and the 12 & 24 port models only have 2 SFPs - hence when stacking these units you would not have any uplinks on the 12 or 24 port units - uplinks from the stack would need to come from a 48p unit.
2) Is the 10GB-C01-
SFPP right cable model for 220 switches?
Yes - that is the 1M cable - you can also use the 10GB-C03-SFPP - which is a 3M cable is further distance is needed.
3) Do I need 4 cables for four switches, right?
Yes - you want to connect a stack in a ring topology - 1 to 2, 2 to 3, 3 to 4, and 4 back to 1
4) Would it be the classical full-ring stack?
Yes.
5) What is the top speed possible for stacking like this? 20Gbps?
correct.
6) Am I right that there are no dedicated stack ports on the back and I should use SFP+ ports?
Correct - as mentioned above, stacking is done via the SFP+ ports.
The 200 series runs the FASTPATH network operating system and does have a different CLI to that of EXOS. It is one that should be familiar to those that have worked with Cisco products in the past.
As to manuals - you can download the 200 Series manuals at -
http://www.extremenetworks.com/support/documentation/
Scroll down to the "Extreme Switching - Software" section and expand on "200 Series"
