Welcome to the board.
I'm not sure I'm reading your post correctly.
What will Cox be bringing into your DMARC? You said they don't have a T-1 service, so I'm assuming they're not bringing a broadband pipe into into an IAD type router that breaks the incomming pipe out into POTS lines and an ethernet port.
If they're bringing POTS directly into the phone room you'll need line card(s). If it's HDSL, then we're back to the IAD question again.
I see you're in LV though, so you're in luck. Whatever you end up needing you'll probably be able to pick up locally from Sundance by clicking hte button at the top of this page.
