Page 552 of 906 NT8D09 Analog Message Waiting Line card553-3001-211 Standard 3.00 August 2005Figure 110Analog message waiting line card – block diagramInput/outputinterfacecontrolMicro-controllerDS-30Xinterface5.12 MHzclockTx PCMAsync cardLAN linkFrontpanelLEDCard LANinterfaceLine interface unit powerRx PCM1 kHzframe syncCard slotaddressBackplaneControllercardLinesignalinginterfaceControllogicRegSignalingand statusAddress/data bus553-6168PowersuppliesRinggenerator–150 V dclightpower+8.5 V dc +5 V dc powerReg+15 V dc +12 V dc powerRinging– 48 V dcbatteryRsyncXFMRSignaling relays(ringing, batteryreversal)Line interface units 0–3TipRingAnalogtelephonelinesLoop current/dialpulse detectMessagewaitingXFMRSignaling relays(ringing, batteryreversal)Line interface units 4–7TipRingAnalogtelephonelinesLoop current/dialpulse detectMessagewaitingXFMRSignaling relays(ringing, batteryreversal)Line interface units 8–11TipRingAnalogtelephonelinesLoop current/dialpulse detectMessagewaitingXFMRSignaling relays(ringing, batteryreversal)Line interface units 12–15TipRingAnalogtelephonelinesLoop current/dialpulse detectMessagewaitingAnaloghybridAnaloghybridAnaloghybridAnaloghybridPCMCodecPCMCodecPCMCodecPCMCodec
