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MT88L85 Datasheet(PDF) 5 Page - Mitel Networks Corporation |
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MT88L85 Datasheet(HTML) 5 Page - Mitel Networks Corporation |
5 / 20 page Advance Information MT88L85 4-75 signal duration to be recognized by the receiver. A value for C1 of 0.1 µF is recommended for most Figure 6 - Guard Time Adjustment VDD St/GT ESt VDD St/GT ESt C1 R1 R2 C1 R1 R2 tGTA = (R1C1) In (VDD/VTSt) tGTP = (RPC1) In [VDD / (VDD-VTSt)] RP = (R1R2) / (R1 + R2) tGTA = (RpC1) In (VDD/VTSt) tGTP = (R1C1) In [VDD / (VDD-VTSt)] RP = (R1R2) / (R1 + R2) a) decreasing tGTP; (tGTP < tGTA) b) decreasing tGTA; (tGTP > tGTA) applications, leaving R1 to be selected by the designer. Different steering arrangements may be used to select independent tone present (tGTP) and tone absent (tGTA) guard times. This may be necessary to meet system specifications which place both accept and reject limits on tone duration and interdigital pause. Guard time adjustment also allows the designer to tailor system parameters such as talk off and noise immunity. Increasing tREC improves talk-off performance since it reduces the probability that tones simulated by speech will maintain a valid signal condition long enough to be registered. Alternatively, a relatively short tREC with a long tDO would be appropriate for extremely noisy environments where fast acquisition time and immunity to tone drop-outs are required. Design information for guard time adjustment is shown in Figure 6. The receiver timing is shown in Figure 7 with a description of the events in Figure 9. Call Progress Filter A call progress mode, using the MT88L85, can be selected allowing the detection of various tones, which identify the progress of a telephone call on the network. The call progress tone input and DTMF input are common, however, call progress tones can only be detected when CP mode has been selected. Figure 7 - Receiver Timing Diagram Vin ESt St/GT RX0-RX3 b3 b2 Read Status Register IRQ/CP EVENTS AB C D E F tREC tREC tID tDO TONE #n TONE #n + 1 TONE #n + 1 tDP tDA tGTP tGTA tPStRX tPStb3 DECODED TONE # (n-1) # n # (n + 1) VTSt |
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