Page 396 of 906 NT6D80 MSDL card553-3001-211 Standard 3.00 August 2005Figure 84MSDL functional block diagramAML LoadwareCPU BusBoot Code& LoaderModulesMSDL HandlerSystem Interface ModulePhysical Layer (Layer 1) HandlerPSOS+Meridian Mail PRI Trunk PRI TrunkSystem softwareMSDL software modulesApplicationModule Link D-ChannelSystemAML Handler SystemDCH HandlerDCH LoadwarePort 0 Port 1 Port 2 Port 3Meridian Link553-5433