ocr: (TRANSIT)T LINK EXCHANGE B EXCHANGE A LINK EXCHANGE Incoming Outgoing Incoming Outgoing Switch block Ti Primary signal Px T4 Primary signal u ti a L T2 2 € U n s a Z Acknowledge- ment 3 D Di ale 01 A O'O DI QIE a D.C. through control t2 T5 - switch block J Acknowledge- D 0' Continuous ment a signal control 8is for primary signal CCITT-46951 Ti,etc. == Time base end line split (35 ms max.) t1= Receiving (125 + 25 ms) - t3 t2=S = Signal Sending end recognition split time (40 + 10 ms) line t4 = 125 + 25 ms typically. FIGURE 1/Q.141 to illustrate the principle of overlap compelled signalling for T ...
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