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536EX Chipset Developer’s Manual 81
Intel Confidential
IS-101 Voice Mode AT Commands
+VSM=m
(cont.)
manufac-
turer-
specified
Compression Method Selection: (cont.)
<sel> Silence Expansion: This command enables the DTE to modify the amount of silence
expansion. This parameter represents the maximum period of silence the DCE expands a period of
silence compressed by the <scs> parameter. The DCE ignores the <sel> parameter if <scs> is zero.
NOTES:
1. Because of the high UART data rates, these compression/sample rates may not be applicable to
the serial host interface (that is, serial box modem) designs (see ATI5 to determine if the modem is
using the serial host interface). For parallel and PC Card host interfaces, the modem ignores the
UART data rate.
2. DTMF detection is provided for all sample rates.
+VSP=m 0
Speakerphone On/Off Control: This command turns on the speakerphone function. This feature
provides full-duplex speakerphone capabilities with internal adaptive echo cancellers. This command
takes the received voice signal and loops it back to the analog transmit pins. The host must configure
the relays and microphone interface as necessary using the AT+VLS=m command. Typically, this
means setting the off-hook relay driver, speaker, and microphone inputs with AT+VLS=13.
After enabling the speakerphone mode (+VSP=1), the modem remains in voice command mode and
provides information about local off-hook detection, DTMF detection, and tone detection—if supported
by the modem board.
Range: 0, 1
0* Speakerphone mode disabled
1 Speakerphone mode enabled
Table 25. Voice Mode Command Descriptions (Continued)
Command Default Description
NOTE: An asterisk (*) denotes the factory-default setting.
<cml>
Compression
<vsr>
Sampling
Rate
Serial
Data Rate (bps)
UART
Data Rate (bps)
Hard Disk
(Bytes/sec.)
Note
<cml> = CL1* 4800 48,000 57,600 4800
7200 72,000 115,200 7200 1
8000 80,000 115,200 8000 1
9600 96,000 115,200 9600 1
11025 110,250 115,200 11,025 1
<cml> = AD3 4800 18,000 19,200 1800
7200 27,000 38,400 2700
8000 30,000 38,400 3000
9600 36,000 38,400 3600
11025 41,344 57,600 4135
<cml> = AD4 4800 24,000 38,400 2400
7200 36,000 38,400 3600
8000 40,000 57,600 4800
9600 48,000 57,600 4800
11025 55,125 57,600 5513
<cml> = LIN1 4800 48,000 57,600 4800
7200 72,000 115,200 7200 1
8000 80,000 115,200 8000 1
9600 96,000 115,200 9600 1
11,025 110,250 115,200 11,025 1
<cml> = LIN2 4800 96,000 115,200 9600 1