ocr: Za 8 To the 2-wire Tot the 4 wire circuit Zc circuit CDF ZA A C R CCITT 49320 CCITT-49310 R receiving part S - =sending part CD = coupling device le. 9. hybrid, set of directional fiiters, elc.) 16/Q.451 FIGURE 17/Q.451 FIGURE Four-wire multifrequency signalling equipment Two-wire multifrequency signalling equipment
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