RH56D-PCI データシートの表示（PDF） - Unspecified
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RH56D-PCI Datasheet PDF : 60 Pages
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RH56D-PCI Modem Designer’s Guide
2.5.2 Voice Receive Mode
This mode is entered when the +VRX command is active in order to record voice or audio data input, typically from a
microphone or the telephone line.
Received analog voice samples are converted to digital form and compressed for reading by the host. AT commands control
the codec sample rate.
Received analog mono audio samples are converted to digital form and formatted into 8-bit µ-Law, A Law, linear, or 4-bit IMA
ADPCM format for reading by the host. AT commands control the bit length and sampling rate. Concurrent DTMF/tone
detection is available.
2.5.3 Voice Transmit Mode
This mode is entered when the +VTX command is active in order to playback voice or audio data, typically to a speaker or to
the telephone line. Concurrent DTMF/tone detection is available. Digitized audio data is converted to analog form.
2.5.4 Speakerphone Modes
Speakerphone modes are selected in voice mode with the following commands:
Speakerphone ON/OFF (+VSP). This command turns the Speakerphone function ON (+VSP = 1) or OFF (+VSP = 0).
Microphone Gain (+VGM=<gain>). This command sets the microphone gain of the Speakerphone function.
Speaker Gain (+VGS=<gain>). This command sets the speaker gain of the Speakerphone function.
2.6 FULL-DUPLEX SPEAKERPHONE (FDSP) MODE
The modem operates in FDSP mode when +FCLASS=8 and +VSP=1 (see 2.5.4).
In FDSP Mode, speech from a microphone or handset is converted to digital form, shaped, and output to the telephone line
through the line interface circuit. Speech received from the telephone line is shaped, converted to analog form, and output to
the speaker or handset. Shaping includes both acoustic and line echo cancellation.
2.7 CALLER ID
Caller ID can be enabled/disabled using the +VCID command. When enabled, caller ID information (date, time, caller code,
and name) can be passed to the DTE in formatted or unformatted form. Inquiry support allows the current caller ID mode and
mode capabilities of the modem to be retrieved from the modem. The retrieval of the Caller ID via an explicit AT query at a
later time is essential for implementing a compliant “Instantly available PC” concept.
2.8 MULTIPLE COUNTRY SUPPORT
All models support modem operation in various countries. The country choice is made via the AT+GCI command or country
select applet from within those installed in Windows registry. The following capabilities are provided in addition to the data
modem functions previously described. Country dependent parameters are included in the .INF file for customization by the
OEM Programmable Parameters
2.8.1 OEM Programmable Parameters
The following parameters are programmable:
• Dial tone detection levels and frequency ranges.
• DTMF dialing transmit output level, DTMF signal duration, and DTMF interdigit interval parameters.
• Pulse dialing parameters such as make/break times, set/clear times, and dial codes.
• Ring detection frequency range.
• Blind dialing disable/enable.
• The maximum, minimum, and default carrier transmit level values.
• Calling tone, generated in accordance with V.25, may also be disabled.
• Call progress frequency and tone cadence for busy, ringback, congested, dial tone 1, and dial tone 2.
• Answer tone detection period.
• On-hook/off-hook, make/break, and set/clear relay control parameters.
2.8.2 Blacklist Parameters
The modem can operate in accordance with requirements of individual countries to prevent misuse of the network by limiting
repeated calls to the same number when previous call attempts have failed. Call failure can be detected for reasons such as
no dial tone, number busy, no answer, no ringback detected, voice (rather than modem) detected, and key abort (dial attempt
aborted by user). Actions resulting from such failures can include specification of minimum inter-call delay, extended delay
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