Found this in 7.0 Docs...
The NTDW79AAE5 - UDT card provides the following features and
functionality:
• DTI/DTI2, PRI/PRI2, DPNSS1/DASS2 and B-channels functionality
• Software transparency that allows you to use it in the installed base
for repairs and upgrades
• Enhanced trouble shooting by way of a Command Line (CLI) interface
• On board DDCH/DCHI functionality
• Secure and simplified UDT card firmware upgrade process from Call
Server (PSDL)
• Highly secured with no Telnet, HTTP and FTP servers
• Uses a universal CC DB (NTDW12AAE5)
Feature interactions
• The UDT CC daughter board can only be mounted on the UDT card.
• The NTAK20 CC daughter board can not be mounted on the UDT
card.
• 75ohm impedance can be used by converting the UDT card 120ohm
impedance using a proper converter.
• The RS232 port is not to be used during normal operation and is for
maintenance and configuration only.
• The UDT card does not simulate the TMDI card (NTRB21). Do not
configure the UDT card as a TMDI card.
• The UDT card can be used starting with software release X21 Release
5.0 for CS 1000E systems.