Lec03_monolitic - Monolithic Design Approach ISDN Terminal Adaptor(HW Timer CPU 80186 Text/Image D/A A/D ROM RAM Voice Handset Siemens Siemens ITAC

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1 Monolithic Design Approach ISDN Terminal Adaptor (HW) CPU 80186 Siemens ISAC ROM RAM Siemens ITAC Timer D/A A/D Handset Voice Text/Image
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2 ISDN Terminal Adaptor (SW) • Control Plane: Protocol Processing – Layer 2: LAPD – Data link management – Layer 3: Q.931 – Call control – Adaptation Layer: Interact to the user • Data Plane: Plain data delivery (no touch) ISDN Terminal Adaptor (SW) LAPD receive a frame send a frame Q.931 receive a message send a message Time Out T3 Time Out T2 to user from user Link establishment Error control Call control
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3 Two fundamental HW components • Interrupt – Whenever a frame is received, ISAC interrupts the CPU •T im e r – Interrupts CPU with programmed period Data Interrupt Handler • void DataIntHandler ()
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4 Timer Interrupt Handler • void TimerIntHandler () – t2++ – if (t2 == T2) {set T2EventFlag; t2=0} – t3++ – if (t3 == T3) {set T3EventFlag; t3=0}
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This note was uploaded on 07/02/2008 for the course COMPUTER S 664 taught by Professor Leechangkyu during the Spring '08 term at Korea University.

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Lec03_monolitic - Monolithic Design Approach ISDN Terminal Adaptor(HW Timer CPU 80186 Text/Image D/A A/D ROM RAM Voice Handset Siemens Siemens ITAC

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