Labels:box | bulletin board | crt screen | earth | grass | sidewalk | sky | windowpane OCR: Signalling channel Switching Switching network network Data channel Transfer channel to T n : Transfer - channel Transfer link Data channel Signalling data link Signalling channel Signalling link Common channel signalling system CCITT. 48852 FIGURE 2/Q.251 Basic diagram of the common channel signalling system Switchine channe Signal ling signatling FICURE
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