Avaya Definity TN773 Processor Circuit Pack (Refurbished)Key Features: Mfr. Part #: TN773 Using AMIS Analog Networking software applications, up to 485 different locations can be networked Provides network control interface (NETCON), the packet interface (PACCON), and, if VX. 25 connectivity is not required, the processor interface (PI) Provides eight asynchronous data channels Required for the si model to save translations to the 5 volt ATA flash memory card