ocr: Sending A 1 I max. T, Outgoing end D T I min. l E tp*to tr t; Receiving C P Receiving Incoming end B F) Sending T2' min. CCITT-48460 Tone-on or -off pending circuit state in which release starts (see S 2.2.2.6) Legend Ip: Propagation time to: - Overall response time of signalling sender and receiver tr: - Recognition time Ij: - Internal operating time FIGURE 5/Q.412 Release-guard sequence
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