Up
This is from a business where my friend works, which moved from a T1 connection to a cheaper DSL connection. I could test it with a power cord only (I'll send you the power cord along with the item), and as you can see, the status lights are working. However, I do not have a T1, so I cannot test its T1 connectivity. However, I assume that it works even though I cannot offer any warranty.
(Click on the thumbnail images to enlarge)