SI2404 SILABS [Silicon Laboratories], SI2404 Datasheet - Page 49

• Manufacturer Part Number: SI2404
• Description: V.90, V.34, V.32BIS, V.22BIS ISOMODEM WITH GLOBAL DAA
• Manufacturer: SILABS [Silicon Laboratories]

U53 MOD2
Reset settings = 0x0000
U62 DAAC1
Reset settings = 0x0804
15:12
Name
Name
10:9
Type
Type
Bit
7:3
Bit
Bit
11
8
2
1
0
14:0
Bit
15
Reserved Must be set to 0.
Reserved Must be set to 1.
Reserved Must be set to 0.
Reserved Must be set to 0.
Reserved Must be set to 0.
D15
D15
REV
R/W
0
Name
OHS2
FOH
DL
Reserved Read returns zero.
D14
D14
Name
0
REV
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.
Fast Off-Hook.
0 = Automatic Calibration Time set to 426 ms.
1 = Automatic Calibration Time set to 106 ms.
Isolation 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. Clear after test is termintated.
D13
D13
OHS
0
1
0
0
V.23 Reversing.
0 = Disable.
1 = Enable.
D12
D12
0
OHS2Mean On-Hook Speed
0 Less than 0.5 ms
1 3 ms ±10% (meets ETSI standard)
X 26 ms ±10% (meets Australia spark quenching spec)
D11
D11
1
D10
D10
0
D9
D9
0
Rev. 1.0
OHS2
R/W
D8
D8
Function
D7
D7
0
Function
D6
D6
0
D5
D5
0
Si2457/34/15/04
D4
D4
0
D3
D3
0
FOH
R/W R/W
D2
D2
D1
DL
D1
D0
D0
0
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