ocr: GP RP Wiring to other line relay sets 1 2 2 ES n n RS 12 12 Four-wire Four-wire Direction of transmission circuit circuit GRD GRAH 2 2 n RS ES 12 12 Wiring to other line relay sets RP GP CCITT-49230 GP - pilot generator RP 1 pilot receiver RS Ler signalling receiver ES 1 signalling sender GRD = outgoing relay set GRA = incoming relay set FIGURE 10/Q.416 Protection from the effect of interruptions (interruption control)
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