Si3056
Si3018/19/10
Register 16. International Control 1
Bit
D7
ACT2
RW
D6
D5
D4
D3
D2
D1
RZ
D0
RT
Name
Type
OHS
R/W
ACT
R/W
IIRE
R/W
R/W
R/W
Reset settings = 0000_0000
Bit
Name
Function
7
ACT2
AC Termination Select 2 (Si3018 line-side device only).
Works with the ACT bit to select one of four ac terminations:
ACT2
ACT
AC Termination
0
0
1
1
0
1
0
1
Real, 600 Ω
Global complex impedance
Global complex impedance, except New Zealand
New Zealand complex impedance
The global complex impedance meets minimum return loss requirements in countries that require
a complex ac termination. For improved return loss performance, the other complex impedances
can be used.
6
OHS
On-Hook Speed.
This bit, in combination with the OHS2 bit (Register 31) and the SQ[1:0] bits (Register 59), sets the
amount of time for the line-side device to go on-hook. The on-hook speeds specified are measured
from the time the OH bit is cleared until loop current equals zero.
OHS
OHS2
SQ[1:0]
00
Mean On-Hook Speed
0
0
1
0
1
X
Less than 0.5 ms
00
3 ms ±10% (meets ETSI standard)
26 ms ±10% (meets Australia spark quenching spec)
11
5
4
ACT
IIRE
AC 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.
IIR 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.
3:2
1
Reserved Read returns zero.
RZ
Ringer Impedance.
0 = Maximum (high) ringer impedance.
1 = Synthesized ringer impedance enabled. See "5.16.Ringer Impedance and Threshold" on page
30.
0
RT
Ringer Threshold Select.
This bit is used to satisfy country requirements on ring detection. Signals below the lower level do
not generate a ring detection; signals above the upper level are guaranteed to generate a ring
detection.
RT
0
RT Lower level
13.5 V
RT Upper level
16.5 V
rms
rms
1
19.35 V
23.65 V
rms
rms
60
Rev. 1.05
SILICON [ SILICON ]
