MX-C250  SIMULATION  6 – 81
101 1 Silent time adjustment when 
receiving CM
0 : 75ms 1 : 500ms
2 Individual SiDaa setting judgement 
after AT+GCI (ADDG1) 
0 : Only GCI command of AT 1 : Activate the SW of indi-
vidual SiDAA registor (U62) 
below GCI +.
3 Individual SiDaa setting judgement 
after AT+GCI (ADDG3) 
0 : Only GCI command of AT 1 : Activate the SW of indi-
vidual SiDAA registor (U63) 
below GCI +.
4 Individual SiDaa setting judgement 
after AT+GCI (ADDG4) 
0 : Only GCI command of AT 1 : Activate the SW of indi-
vidual SiDAA registor (U65) 
below GCI +.
5 Individual SiDaa setting judgement 
after AT+GCI (ADDG5) 
0 : Only GCI command of AT 1 : Activate the SW of indi-
vidual SiDAA registor (U66) 
below GCI +.
6 Individual SiDaa setting judgement 
after AT+GCI (ITC1) 
0 : Only GCI command of AT 1 : Activate the SW of indi-
vidual SiDAA registor (U67) 
below GCI +.
7 Individual SiDaa setting judgement 
after AT+GCI (ITC3) 
0 : Only GCI command of AT 1 : Activate the SW of indi-
vidual SiDAA registor (U68) 
below GCI +.
8 Individual SiDaa setting judgement 
after AT+GCI (ITC4) 
0 : Only GCI command of AT 1 : Activate the SW of indi-
vidual SiDAA registor (U6A) 
below GCI +.
102 1 U62 Reg. DAAC1 FULL2 0 : DAA FULL2 bit cleared 1 : DAA FULL2 bit set.
2 U62 Reg. DAAC1 On-Hook Speed 
2
0 : Not used at this moment 1 : Not used at this moment
3 U62 Reg. DAAC1 FOH 0 : Automatic calibration timer 
set to 426 ms.
1 : Automatic calibration 
timer set to 106 ms.
4 U62 Reg. DAAC1 DL 0 : Digital loopback beyond 
isolation capacitor interface.
1 : Digital loopback across 
isolation capacitor interface 
only.
5 - 8 U63 Reg. DAAC3 AC Termination 
Select
Real 600 Ω 0 0 0 0
220 Ω + (820 Ω || 120 nF) and 
220 Ω + (820 Ω || 115 nF)
0 0 1 1
370 Ω + (620 Ω || 310 nF) 0 1 0 0
Global complex impedance 1 1 1 1
103 1 U65 Reg. DAAC4 PWM Gain 0 : No gain. 1 : 6 dB gain applied to 
AOUT.
2 U65 Reg. DAAC4 Powerdown 0 : Normal. 1 : Powerdown.
3 U65 Reg. DAAC4 Powerdown 
Line-Side Chip
0 : Normal operation. 1 : Places the Si3018 in 
powerdown mode.
4 U66 Reg. DAAC5 Frame Detect 0 : Isolation link frame lock not 
established.
1 : Isolation link frame lock 
established.
5 - 6 U67 Reg. ITC1 Minimum Opera-
tional Loop Current
10mA 0 0
12mA 0 1
14mA 1 0 
16mA 1 1 
7 U67 Reg. ITC1 Current Limiting 
Enable
0 : Current limiting mode dis-
abled.
1 : Current limiting mode 
enabled.
8 U67 Reg. ITC1 DC Impedance 
Selection
0 : 50 Ω dc termination slope is 
selected.
1 : D800 
Ω dc termination is 
selected.
104 1 - 2 U67 Reg. ITC1 TIP/RING Voltage 
Adjust
3.1 V–4 dB 0 0
3.2 V–2 dB 0 1
3.35 V0 dB 1 0 
3.5 V0 dB 1 1 
3 U67 Reg. ITC1 Ringer Impedance 0 : Maximum (high) ringer 
impedance.
1 : Synthesize ringer 
impedance. C
4 U67 Reg. ITC1 Ringer Threshold 
Select
0 : 11 to 22 Vrms. 1 : 17 to 33 Vrms.
5 U67 Reg. ITC1 On-Hook Speed 0 : Not used at this moment 1 : Not used at this moment
6 U68 Reg. ITC3 Billing Tone Protect 
Enable
0 : Disabled. 1 : Enabled.
7 U68 Reg. ITC3 Receive Overload 0 : Normal receive input level. 1 : Excessive receive input 
level.
8 U68 Reg. ITC3 Billing Tone 
Detected
0 : No billing tone. Billing tone detected 
(cleared by writing 0).
SW 
No.
Bit 
No.
System set-
tings
Item SW selection and function Remarks