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RP144D Datasheet(PDF) 5 Page - Synaptics Incorporated. |
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RP144D Datasheet(HTML) 5 Page - Synaptics Incorporated. |
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5 / 18 page  /RZ9ROWDJH9 .IOH[99ELV0RGHP'DWD3XPSV 53'53'DQG53' 0' Automatic Mode Selection When automatic mode selection (AMS) is enabled, the MDP configures itself to the highest compatible data rate supported by the remote modem (AUTO bit). Automode operation is supported in V.90, K56flex, V.34, V.32 bis, V.32 V.22 bis, V.22, V.21, V.23, Bell 212A, and Bell 103 modes. Automatic Rate Adaption (ARA) In V.90, K56flex, V.34, and V.32 bis modes, automatic rate adaption (ARA) can be enabled to select the highest data rate possible based on the measured eye quality monitor (EQM) (EARC bit). This selection occurs during handshake/retrain and rate renegotiation. Tone Generation The MDP can generate single or dual voice-band tones from 0 Hz to 3600 Hz with a resolution of 0.15 Hz and an accuracy of ± 0.01%. Tones over 3000 Hz are attenuated. DTMF tone generation allows the MDP to operate as a programmable DTMF dialer. Data Encoding The data encoding conforms to ITU-T recommendations V.90, V.34, V.32 bis, V.32, V.17, V.33, V.29, V.27 ter, V.22 bis, V.22, V.23, or V.21, and is compatible with Bell 208, 212A, or 103, depending on the model and selected configuration. RTS - CTS Response Time The response times of CTS relative to a corresponding transition of RTS are listed in Table 3. Transmit Level The transmitter output level is selectable from 0 dBm to -15 dBm (VAA = +5V) in 1 dB steps and is accurate to ±0.5 dB when used with an external hybrid. The output level can also be fine tuned by changing a gain constant in MDP DSP RAM. The maximum V.34/V.32 bis/V.32 transmit level for acceptable receive performance should not exceed -9 dBm. Note: In V.34 mode, the transmit level may be automatically changed during the handshake. This automatic adjustment of the transmit level may be disabled via a parameter in DSP RAM. Transmitter Timing Transmitter timing is selectable between internal (±0.01%), external, or slave. Scrambler/Descrambler A self-synchronizing scrambler/descrambler is used in accordance with the selected configuration. Answer Tone When the NV25 bit is a zero, the MDP generates a 2100 Hz answer tone at the beginning of the answer handshake for 5.0 seconds (V.8) or 3.6 seconds (V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21). The answer tone has 180° phase reversals every 0.45 second to disable network echo cancellers (V.8, V.32 bis, V.32). 7DEOH 576&76 5HVSRQVH 7LPHV RTS-CTS Response 1 Configuration Constant Carrier Controlled Carrier Turn-Off Sequence 3 V.90, K56flex, V.34, V.32 bis, V.32 ± 2 ms N/A N/A V.33/V.17 Long N/A 1393 ms 2 15 ms 4 V.33/V.17 Short N/A 142 ms 2 15 ms 4 V.29 N/A 253 ms 212 ms V.27 4800 Long N/A 708 ms 2 7 ms 4 V.27 4800 Short N/A 50 ms 2 7 ms 4 V.27 2400 Long N/A 943 ms 2 10 ms 4 V.27 2400 Short N/A 67 ms 2 10 ms 4 V.22 bis, V.22, Bell 212A ± 2 ms 270 ms N/A V.21 500 ms 500 ms N/A V.23, Bell 103 210 ms 210 ms N/A Notes: 1. Times listed are CTS turn-on. The CTS OFF-to-ON response time is host programmable in DSP RAM. (Full- duplex modes only.) 2. Add echo protector tone duration plus 20 ms when echo protector tone is used during turn-on. 3. Turn-off sequence consists of transmission of remaining data and scrambled ones for controlled carrier operation. CTS turn-off is less than 2 ms for all configurations. 4. Plus 20 ms of no transmitted energy. 5. N/A = not applicable. Receive Level The MDP satisfies performance requirements for received line signal levels from –9 dBm to –43 dBm measured at the Receiver Analog (RXA) (TIP and RING) input (-15 dBm at RIN). Note: A 6 dB pad is required between TIP and RING and the RIN input. Receiver Timing The timing recovery circuit can track a frequency error in the associated transmit timing source of ±0.035% (V.22 bis) or ±0.01% (other configurations). Carrier Recovery The carrier recovery circuit can track a ±7 Hz frequency offset in the received carrier. Clamping Received Data (RXD) is clamped to a constant mark whenever the Received Line Signal Detector (~RLSD) is off. ~RLSD can be clamped off (RLSDE bit). |
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Similar Description - RP144D |
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