Page 570 of 906 NT8D14 Universal Trunk card553-3001-211 Standard 3.00 August 2005Functional descriptionFigure 114 shows a block diagram of the major functions contained on theNT8D14 Universal Trunk card. Each of these functions is described on thefollowing pages.Figure 114NT8D14 Universal trunk card – block diagramInput/outputinterfacecontrolCodecPCMMicro-controllerDS-30Xinterface5.12 MHzclockTx PCMAsync cardLAN linkFrontpanelLEDCard LANinterfaceAnaloghybrid XFMR TipSignalingrelaysAnalogtrunk facilities(CO/FX/WATS,DID, tie, RAN,or paging)Trunk interface units 0–3SignaldetectionSignalhybridRing**Analoghybrid XFMR TipSignalingrelaysAnalogtrunk facilities(CO/FX/WATS,DID, tie, RAN,or paging)Trunk interface units 4–7SignaldetectionSignalhybridRing**CodecPCMRx PCM1 kHzframe syncCard slotaddressBack-planeCon-trollercard TrunksignalinginterfaceControllogicSignalingand statusAddress/data bus* Signalinglines forRAN orpagingcontrol553-CSE6197
