ocr: Ready 1,OFF 1,OFF DTE DCE 13R 13S Receive data Send data DTE/DCE Any 1.OFF state D,ON D.ON 1,OFF DCE DTE DCE 13 DCE Data transfer not ready D,ON 1,OFF or D, ON D,ON CCITT-25030 0, OFF Note - States 13S, 13R and 13 may be entered from any of the quiescent states shown in Figure A-1/X.21. FIGURE A-3/X.21 Leased circuit service - point-to-point and packet-switched service
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