Intel 537EX Intel Confidential, IS-101Voice Mode AT Commands, 536EX Chipset Developer’s Manual

IS-101 Voice Mode AT Commands

Table 25. Voice Mode Command Descriptions (Continued)

Command Default Description

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.

		<cml>	<vsr>	Serial	UART	Hard Disk
			Sampling				Note
		Compression		Data Rate (bps) Data Rate (bps)		(Bytes/sec.)
			Rate
		<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
	manufac-		9600	36,000	38,400	3600
+VSM=m			11025	41,344	57,600	4135
	turer-
(cont.)
	specified	<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

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.

		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.
+VSP=m	0	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

NOTE: An asterisk (*) denotes the factory-default setting.

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