TN2401
In R9si systems, the TN2401 Net/Pkt interface circuit pack replaces the TN794. The TN2401 provides the functionality of the TN777B network control interface (NETCON), the TN778 packet interface (PACCON), and, if BX.25 connectivity is not required, the TN765 processor interface (PI). The TN2401 provides eight asynchronous data channels, whereas the NETCON TN777B provides only four channels. It goes into the control carrier slot that was used by the NETCON TN777B. The TN2401 does not include modems. The TN2401 is required for the si model to save translations to the new 5-volt ATA flash memory card.
