SI3056-KS Datasheet(数据表) 60 Page - Silicon Laboratories

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zoom inzoom out 60 pageSi3056Si3018/19/1060Rev. 1.05Reset settings = 0000_0000Register 16. International Control 1BitD7D6D5D4D3D2D1D0NameACT2OHSACTIIRERZRTTypeRWR/WR/WR/WR/WR/WBitNameFunction7ACT2AC Termination Select 2 (Si3018 line-side device only).Works with the ACT bit to select one of four ac terminations:ACT2ACTAC Termination00Real, 600Ω01Global complex impedance10Global complex impedance, except New Zealand11New Zealand complex impedanceThe global complex impedance meets minimum return loss requirements in countries that requirea complex ac termination. For improved return loss performance, the other complex impedancescan be used.6OHSOn-Hook Speed.This bit, in combination with the OHS2 bit (Register 31) and the SQ[1:0] bits (Register 59), sets theamount of time for the line-side device to go on-hook. The on-hook speeds specified are measuredfrom the time the OH bit is cleared until loop current equals zero.OHSOHS2SQ[1:0]Mean On-Hook Speed0000Less than 0.5 ms01003 ms ±10% (meets ETSI standard)1X1126 ms ±10% (meets Australia spark quenching spec)5ACTAC Termination Select. (Si3018 line-side device only).When the ACT2 bit is cleared, the ACT bit selects the following:0= Selects the real ac impedance (600 Ω)1= Selects the global complex impedance.4IIREIIR Filter Enable.0= FIR filter enabled for transmit and receive filters. See Figures 7–10 on page 16.1= IIR filter enabled for transmit and receive filters. See Figures 11–16 on page 17.3:2Reserved Read returns zero.1RZRinger Impedance.0= Maximum (high) ringer impedance.1= Synthesized ringer impedance enabled. See 5.16.Ringer Impedance and Threshold on page30.0RTRinger Threshold Select.This bit is used to satisfy country requirements on ring detection. Signals below the lower level donot generate a ring detection; signals above the upper level are guaranteed to generate a ringdetection.RTRT Lower levelRT Upper level013.5 Vrms16.5 Vrms119.35 Vrms23.65 Vrms