Nortel NT8B90AC-93 Analog Terminal Adapter With Power Supply (Refurbished)The Nortel Norstar NT8B90AC Analog Terminal Adapter (ATA) serves as an interface between the digital station set ports and analog tip plus ring devices. This is the pre ATA2 unit, however it works exactly the same but is slightly larger in size. The NT8B90AC ATA's Power Supply is included. More Information: Mnfr. Part # NT8B90AC 93