HELP - Point to Point T1, Cisco2514 & Paradyne 3160

Hello all, this one has me stumped for sure!

Essentially, the CSU/DSU is NOT talking to the cisco... Any help or
advice would be greatly appreciated.
Here is the setup:

ATT Paradyne 3160 is connected to the Cisco 2514 via serial cable
(Cisco CAB-X21MT) one end in the cisco serial connector and the other,
a 15 pin 'DTE' perhaps 'X21' connector. The cable is plugging into the
Paradyne via the 'DTE' port, although there are a couple DB25 ports on
the Paradyne that I am not sure what they are used for.
1) The Paradyne is reporting "LOS at DTE" :: additionaly, two
indicators on the device that are on steady, are amber; they are
'OOF/TXD' and 'ALARM/RXD'
2) The Cisco is reporting Interface UP, line protocol DOWN ::
additionaly here is some output from a 'sh int s0'
<DCD=up DSR=up DTR=up RTS=up CTS=up>
++++++

Why is the Paradyne not talking? I have two of these devices and both
exhibit this behaviour...
To make a long story short... it is not working!
Can anyone offer any advice or suggestions? That would be GREATLY
appreciated!

-Mike