SHARP UX-A450
Service Manual

UX-A450DE/IT/H NX-A550DE/IT/FO-A650IT B) Modem block
1) Facsimile Modem
The modem can operate at 14400, 12000, 9600, 7200, 4800, 2400, or 300 bps, and can perform HDLC framing per T.30 at all rates. A programmable DTMF detector, three programmable tone detectors, V.21 Channel 2 FSK 7E flag detector, Caller ID demodulator and ring detector are provided.

4) Features

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Group 3 facsimile transmission/reception ITU-T V.17 and V.33 ITU-T V.29, V.27 ter, T.30, V.21 Channel 2, T.4 ITU-T V.17 and V.27 ter short train HDLC framing at all speeds Receive dynamic range: 0 dBm to -43 dBm Automatic adaptive equalization Fixed and programmable digital compromise equalization DTMF detect and tone detect ITU-T V.21 Channel 2 FSK 7E Flag Detect Ring detector Programmable transmits level Programmable single/dual tone transmission

2) Voice and Audio Codecs
The voice coder/decoder (codec) compresses voice at an average rate of 2.9 kbps which provides 24 minutes of stored voice messages in 4 Mbits of memory. But for UX-A450DE/IT/H/NX-A550DE/IT/FO-A650IT, a part of memory is used for other usages. So the total recording time is shortened at about 20 minutes. This voice codec allows the host controller to efficiently store and playback digital incoming messages (ICMs), outgoing messages (OGMs). The ADPCM audio codec compresses audio signals (music/voice) at 32 kbps or 24 kbps and the PCM audio codec records audio signals at 128 kbps or 64 kbps for highest fidelity coding and reproduction. Selectable error correction coding allows storage in audio grade RAMs (ARAMs). Echo cancellation techniques employed during playback allow DTMF tone and Type II Caller ID CAS detection during voice/audio codec operation to support user selectable features. The coder can record messages from the PIA or SIA. The decoder can playback messages to the PIA or both the PIA and SIA. Dual/signal tone transmission is available when the decoder is disabled.

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Voice codec 24 minutes of voice storage per 4 Mbit memory Near toll quality voice recording and playback Programmable AGCs Programmable line/microphone input and line/speaker output filters Error correction coding allows ARAM usage DTMF detect, tone detect, and tone transmit Type II Caller ID CAS detection Pitch synchronized fast and slow playback Near-end echo cancellation

3) V.23 Full-duplex Modem and Caller ID
Both full-duplex transmit and receive (with asymmetric 1200/75 bps connection) and half-duplex (1200 bps) asynchronous V.23 are supported, as will as both serial and parallel interfaces to the modem. The V.23 algorithm includes an optional, programmable. receive compromise equalizer which is active in both V.23 and Caller ID (V.23 Receive only) modes. Common applications for V.23 include France�s Minitel and Japan�s Lowest Cost Routing.

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ADPCM Audio codec High fidelity recording and playback of audio signals 32 kbps and 24 kbps Programmable AGCs Programmable line/microphone input and line/speaker output filters DTMF detect, tone detect, and tone transmit Type II Caller ID CAS detection Near-end echo cancellation

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PCM audio codec 128 kbps and 64 kbps DTMF detect and tone detect Type II Caller ID CAS detection Near-end echo cancellation

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V.23 and Type I Caller ID Full-duplex modes: TX = 75 bps. RX = 1200 bps TX = 1200 bps. RX = 75 bps Half-duplex mode: TX = RX = 1200 bps Serial and parallel data modes Programmable parallel data mode 5, 6, 7, or 8 data bits 1 or 2 Stop bits Mark, Space, Even, or Odd Parity Break function Transmitter squelch Compromise equalizer

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3.3V/5V operation