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RC56LD Datasheet(PDF) 7 Page - Synaptics Incorporated. |
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RC56LD Datasheet(HTML) 7 Page - Synaptics Incorporated. |
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7 / 22 page  ,QWHJUDWHG9 .IOH[99ELV0RGHP'HYLFH6HWV 5&/'5&/'DQG5&/' MD213 Conexant 7 In V.32 bis mode, the modem operates at line speeds up to 14.4 kbps. In fax modem mode, the modem can operate in 2-wire, half-duplex, synchronous mode and can support Group 3 facsimile send and receive speeds of 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000, 9600, 7200, 4800, and 2400 bps. Using V.34 modulation to optimize modem configuration for line conditions, the modem can connect at the highest data rate that the channel can support at speeds up to 33.6 kbps with automatic rate adaption. Fax data transmission and reception performed by the modem are controlled and monitored through the EIA/TIA-578 Fax Class 1, T.31 Fax Class 1.0, or Fax Class 2 command interface. Full HDLC formatting, zero insertion/deletion, and CRC generation/checking are provided. Both transmit and receive fax data are buffered within the modem. Data transfer to and from the DTE is flow controlled by XON/XOFF and RTS/CTS. Synchronous Access Mode (SAM) V.80 synchronous access mode between the modem and the host/DTE is provided for host-based communication protocols, e.g., H.324 video conferencing applications. Voice-call-first (VCF) before switching to a videophone call is also supported. World Class Operation W-class functions support modem operation in multiple countries. Additional modem functions are provided in areas such as dialing, carrier transmit level, calling tone, call progress tone detection, answer tone detection, blacklisting, and relay control. Country dependent parameters are programmable by ConfigurACE II for Windows. Voice/TAM Mode Voice/TAM Mode features include enhanced ADPCM compression/decompression, tone detection/generation and call discrimination, concurrent DTMF detection, and 8-bit monophonic audio data encoding. Voice/TAM Mode is supported by three submodes: 1. Online Voice Command Mode supports connection to the telephone line or, for SP models, a handset. 2. Voice Receive Mode supports recording voice or audio data input at the RIN pin, typically from the telephone line or, for SP models, a microphone/handset. 3. Voice Transmit Mode supports playback of voice or audio data to the TXA1/TXA2 output, typically to the telephone line or, for SP models, a speaker/handset. Telephony Extension Operation Extension pickup/remote hangup detection and line-in-use detection are supported in serial DTE models optionally (in lieu of cellular/GSM support) in parallel host models. Speakerphone Mode (SP Models) The speakerphone mode features an advanced proprietary speakerphone algorithm which supports full- duplex voice conversation with both acoustic and line echo cancellation. Parameters are constantly adjusted to maintain stability with automatic fallback from full-duplex to pseudo-duplex operation. The speakerphone algorithm allows position independent placement of microphone and speaker. The speakerphone mode provides hands-free full-duplex telephone operation under host control. The host can separately control volume, muting, and AGC in microphone and speaker channels. AudioSpan Mode (SP Models) AudioSpan provides full-duplex analog simultaneous audio/voice and data over a telephone line at a data rate of 4800 bps with audio using V.61 modulation. AudioSpan can send any type of audio waveform, including music. Data can be sent with or without error correction. The audio/voice interface can be in the form of a headset, handset, or a microphone and speaker. Handset echo cancellation is provided. DSVD Mode using RCDSVD SCP Device (SP Models) On-board DSVD operation requires installation of the optional RCDSVD SCP (R6715-14). GSM operation is not available when the RCDSVD SCP is connected because MCU port PB5 is used for SCP chip select output (~SVDSEL) rather than address line A18 output which is needed to support the 4M ROM. DSVD provides full-duplex digital simultaneous voice and data over a single telephone line. DSVD uses codecs in the RCDSVD SCP to code (compress) analog speech signal on the RCDSVD LINEIN pin or MICIN pin for passing to the modem controller in digitized form, and to decode (decompress) coded speech received from the modem controller for routing to the RCDSVD LINEOUT pin or SPKP/SPKN pins in analog form. DSVD operates in accordance with ITU-T interoperable G.729 and G.729 Annex A with interoperable G.729 Annex B. Voice activity detection supports speech coding at average bit rate significantly lower than 8.0 kbps. DSVD decoder timing recovery algorithm compensates for clock skew, asynchronous host-to-decoder data transfer delay, intervening variable length data block transmission delay, and loss of encoded speech data. The voice interface can be in the form of a headset, handset or a microphone and speaker (half-duplex speakerphone). Handset echo cancellation supports handset use through a hybrid. In Handset Mode, the RCDSVD SCP interfaces to the telephone interface circuit using the Line Input (LINEIN) and Line Out (LINEOUT) lines. In Headset or Speakerphone Mode, the RCDSVD SCP interfaces to the audio interface circuit using the Microphone Input (MICIN) and Speaker out (SPKR) lines. Host-Based DSVD All modem models support host-based ITU-T V.70 DSVD. The RCDSVD SCP (R6715) is not required. V.70 software drivers for Windows 95 are provided which support a speech/audio bit rate of significantly less than 8.0 kbps by implementing interoperable G.729 and G.729 Annex A with interoperable G.729 Annex B. The minimum PC performance recommended for host-based DSVD is |
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