You can consider the 2950 for this purpose. You will only have 100Mb or maybe an etherchannel as your uplink.
A preferrable solution would be to use the 3550-12G and two plain 3548 switches. You can then connect the other floors through Gigabit links using either copper or fiber GBICs. This will be slightly more expensive, but far more performant and extendible.
As the 3548 is fast becoming an eol, can i use the 2950G-48 and stack them them in and out onto one aonther and eventually to the 3550-48-EMI. How many of such stacks can i have and will all these 2950?? be able to use the L3 function of the 3550-48-EMI to route?
As long as you have sufficient ports (GBIC slots) to so, yes.
Keep in mind that the stacking or daisy-chaining of several switches reduces overall availabilty. A failure in one stack wil cause all subsequent switches to lose connectivity as well. With the 3550-12G you can create a star-shaped topology that is more reliable.
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