Labels:and circuit | box | earth | grass | shelf | sky | windowpane OCR: Utility tnter r-Processor processor 1/0 messages CPU Digital Switching Network IUP IUP tUP IUP P PH IU1 1U2 iUm IUn Signal- Applied Traffic Mix ling minal Tl107770-87 CPU Central Processing Unit IU Interface Unit IUP Inter face Unit Processor PH Packet Handler FIGURE A-1/Q 543 Exampte of an exchange design with several processors T1107770
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