Specifications

Si2457/Si2434/Si2415
Rev. 0.91 43
U33 RMOT Ringback cadence minimum on time in seconds multiplied by 7200. 0x1200
U34 DTWD Window to look for dialtone in seconds multiplied by 1000. 0x1B58
U35 DMOT Minimum dialtone on time in seconds multiplied by 7200. 0x2D00
U37 PD0 Number of pulses to dial 0. 0x000A
U38 PD1 Number of pulses to dial 1. 0x0001
U39 PD2 Number of pulses to dial 2. 0x0002
U3A PD3 Number of pulses to dial 3. 0x0003
U3B PD4 Number of pulses to dial 4. 0x0004
U3C PD5 Number of pulses to dial 5. 0x0005
U3D PD6 Number of pulses to dial 6. 0x0006
U3E PD7 Number of pulses to dial 7. 0x0007
U3F PD8 Number of pulses to dial 8. 0x0008
U40 PD9 Number of pulses to dial 9. 0x0009
U42 PDBT Pulse dial break time (ms units). 0x003D
U43 PDMT Pulse dial make time (ms units). 0x0027
U45 PDIT Pulse dial interdigit time (ms units). 0x0320
U46 DTPL DTMF power level—16-bit format is 0x0(H)(L)0 where H is the
(–)dBm level of the high-frequency DTMF tone and L is the (–)dBm level of
the low-frequency DTMF tone. Note that twist may be specified here.
0x09B0
U47 DTNT DTMF on time (ms units). 0x0064
U48 DTFT DTMF off time (ms units). 0x0064
U49 RGFH Ring frequency high—Maximum frequency ring to be considered a valid ring.
RGFH = 2400/(maximum ring frequency).
0x0022
U4A RGFD Ring delta 0x007A
U4B RGMN Ring cadence minimum ON time in seconds multiplied by 2400. 0x0258
U4C RGNX Ring cadence maximum total time in seconds multiplied by 2400. 0x6720
U4D MOD1 This is a bit-mapped register. 0x0000
U4E PRDD Pre-dial delay-time after ATD command that modem waits to dial (ms units).
The Si2457/34/15 stays on-hook during this time.
0x0000
Table 15. U-Register Description (Continued)
Register Name Description Default
RGFD 2400 Hz
1
min ring freq (Hz)
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⎝⎠
⎛⎞
×
1
max ring freq (Hz)
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⎝⎠
⎛⎞
–=