Specifications

Si2404
44 Rev. 0.91
Reset settings = 0x0000
Reset settings = 0x0804
U53 MOD2
BitD15D14D13D12D11D10D9D8D7D6D5D4D3D2D1D0
Name
REV
Type
R/W
Bit Name Function
15 REV V.23 Reversing.
0=Disable.
1 = Enable.
14:0 Reserved Read returns zero.
U62 DAAC1
Bit D15D14D13D12D11D10D9 D8 D7D6D5D4D3D2D1D0
Name0000100OHS200000FOHDL0
Type R/W R/W R/W
Bit Name Function
15:12 Reserved Must be set to 0.
11 Reserved Must be set to 1.
10:9 Reserved Must be set to 0.
8OHS2
On-Hook Speed 2.
This bit works in combination with the OHS bit (U67, bit 6) to set the on-hook speed. The on-
hook speeds are measured from the time the OH bit is cleared until loop current equals zero.
OHS OHS2Mean On-Hook Speed
0 0 Less than 0.5 ms
0 1 3 ms ±10% (meets ETSI standard)
1 X 26 ms ±10% (meets Australia spark quenching spec)
7:3 Reserved Must be set to 0.
2FOHFast Off-Hook.
0 = Automatic Calibration Time set to 426 ms.
1 = Automatic Calibration Time set to 106 ms.
1DLIsolation Digital Loopback (see the AT&T commands).
0 = Loopback occurs beyond the DAA interface, out to and including the analog
hybrid circuit.
1 = Enables digital loopback mode across isolation barrier only.
0 Reserved Must be set to 0.