A medium budget precludes ATM. Makes ISDN iffy - an ISDN simulator is
required. For Frame Relay you just need a router with three or more serial
interfaces. The GroupStudy archives have detailed answers to all aspects of
a home lab.
I have purchased quite a bit of gear on eBay. Had a few problems
I would recommend a 4xxx series. You can add the modules you need.
serial mod's for about 2-to-4 hundred - frame
np-4/8b-s/t/u any combo about 1-to-2 hundred - isdn
np-a1-oc3mm wow about 1200 hundred - atm
np-1/2r about 50-100 dollars
check to make sure that the 4xxx can handle the mods not all do
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