Definity TN801B MAPD (LAN Gateway Interface) (TN801B) - Part of the Multi-Application Platform Definity (MAPD). Allows direct integration of PC-based application into the switch. This circuit pack works as the interface for such solutions as CTI, CallVisor, and PC/LAN. Provides packet bus and TDM bus interfacing, physical mounting for a CPU, external interfaces, and mapping of circuit switched connections between the TDM bus and the expansion circuit pack. ASAI R8.2.1 Software. CVLAN / DLG.