Page 572 of 906 NT8D14 Universal Trunk card553-3001-211 Standard 3.00 August 2005Card control functionsControl functions are provided by a microcontroller, a card LAN interface,and signaling and control circuits on the NT8D14 Universal Trunk card.MicrocontrollerThe NT8D14 Universal Trunk card contains a microcontroller that controlsthe internal operation of the card and the serial card LAN link to the controllercard. The microcontroller controls the following:• reporting to the CE CPU through the card LAN link:— card identification (card type, vintage, and serial number)— firmware version— self-test status— programmed configuration status• receipt and implementation of card configuration through the card LANlink:— programming of the codecs— enabling/disabling of individual units or entire card— programming of input/output interface control circuits foradministration of trunk interface unit operation— maintenance diagnostics— transmission pad settingsCard LAN interfaceMaintenance data is exchanged with the common equipment CPU over adedicated asynchronous serial network called the Card LAN link.Signaling and controlThe signaling and control portion of the Universal Trunk card works with theCPU to operate the card hardware. The card receives messages from the CPUover a signaling channel in the DS-30X loop and returns status information tothe CPU over the same channel. The signaling and control portion of the card
