DO NOT ask me the specs I have nver used TC chassis and never care too. Anyway 3 USR Total Control hubs 48 V.90 modems in each T1 NIC/NAC card sets One chassis with pots ports. Here is the deal. Make arrangements to pick up this WEEK I will in no way help to ship package or describe the units. I am located in mount pleasant, MI 48858 These are free I just want them gone, if someone can make use of the parts come get them otherwise they will be in the dumpster saturday. --Matt