Avaya Definity TN794 Network Control/Packet Interface (Refurbished)Avaya Definity TN794 Network Control Packet Interface. More Information Replaces the NETCON (TN777B) and PACCON (TN778) in R8 or later si systems Not backward compatible with earlier releases Inserts into the NETCON slot and may require a TN2400 Net Pkt Backplane Connection (R6si and older field upgrades when reusing the existing Control Cabinet only) Provides LAPD connections over the TDM bus previously provided by the Processor Interface (TN765)