Si3056
Si3018/19/10
60
Rev. 1.05
Reset settings = 0000_0000
Register 16. International Control 1
Bit
D7D6D5
D4D3D2
D1D0
Name
ACT2
OHS
ACT
IIRE
RZ
RT
Type
RW
R/W
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
00
Real, 600
0
1
Global complex impedance
1
0
Global complex impedance, except New Zealand
1
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.
6OHS
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]
Mean On-Hook Speed
0
00
Less than 0.5 ms
0
1
00
3 ms ±10% (meets ETSI standard)
1
X
11
26 ms ±10% (meets Australia spark quenching spec)
5
ACT
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 )
1
= Selects the global complex impedance.
4
IIRE
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
Reserved Read returns zero.
1RZ
Ringer Impedance.
0
= Maximum (high) ringer impedance.
1
0RT
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
RT Lower level
RT Upper level
013.5 Vrms
16.5 Vrms
1
19.35 Vrms
23.65 Vrms