COMPONENT DESCRIPTIONS10-35Edition OneXC1000 Service7. The DLC compresses the digitized voice samples using digital signalprocessing (DSP) cells. The DSP cells assemble the digitized voicesamples into data records.8. The CPU sets up a data-bus transfer between the DLC and themessage-file card. The message-file card selects a message drive andaddress to store the message.9. The DLC sends the compressed voice data over the data bus to themessage-file card, which writes the data onto the selected messagedrive.10. The message-file card sends the following information to the CPU: thelocation of the message on the disk, caller identification, and the time,priority, and length of the message. The CPU updates the user recordof the subscriber with this information through the system-file card.11. The caller disconnects from XC1000 by hanging up or pressing adisconnect key. The DLC detects the caller disconnect or the discon-nect command, forces the line to the idle state, and notifies the CPUusing a control bus message.12. The CPU instructs the DLC to go on-hook and disconnect the line.The DLC disconnects the line and continues polling all TIC ports for achange of status.10.10 HIGHLIGHTS The common-control cards in a XC1000 are as follows: Central processing unit (CPU) Monitor card System-file card Message-file card The line-card-groups comprise the following cards: Digital line cards (DLCs) Telephone interface cards (TICs) The following TICs can be used: Analog TIC (ATIC) T1 TIC Direct-inward-dialing TIC (DID TIC) E&M TIC E1 TIC Primary-rate-interface TIC (PTIC) The hot-plug capability allows service personnel to replace existingDLCs and TICs while the XC1000 is on-line. Three power-distribution circuit breakers are provided for +5 Vdc, +12Vdc, and –48 Vdc. The CPU, monitor card, file cards, DLCs, and TICs plug into the mainbackplane.SECTION 10.9 – 10.10
