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FM214 データシート(PDF) 4 Page - List of Unclassifed Manufacturers |
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FM214 データシート(HTML) 4 Page - List of Unclassifed Manufacturers |
4 / 12 page 4 MD205 Technical Specifications Configurations, Symbol Rates and Data Rates The selectable modem configurations, along with the corresponding symbol (baud) rates and data rates, are listed in Table 2. Scrambler/Descrambler The modem incorporates a self-synchronizing scrambler/descrambler in accordance with ITU-T V.33, V.17, V.29, and V.27 ter recommendations, depending upon the selected configuration. Data Encoding The data encoding conforms to ITU-T recommendations V.33, V.17, V.29, V.27 ter, V.21 Channel 2, and V.23. Fixed Digital Cable Compromise Equalizer Compromise equalization can improve performance when operating over low quality lines. The modem has a selectable fixed digital compromise cable equalizer in the high speed receive and transmit data path. Transmitted Data Spectrum The transmitted data spectrum is shaped in the baseband by an excess bandwidth finite impulse response (FIR) filter with the following characteristics: When operating at 2400 baud, the transmitted spectrum is shaped by a square root of 20% raised cosine filter. When operating at 1600 baud, the transmitted spectrum is shaped by a square root of 50% raised cosine filter. When operating at 1200 baud, the transmitted spectrum is shaped by a square root of 90% raised cosine filter. The out-of-band transmitter energy levels in the 4 - 50 kHz frequency range are below -55.0 dBm. Transmit Level The transmitter output level is programmable in the DSP RAM from 0 dBm to -15.0 dBm and is accurate to ±1.0 dB. The modem adjusts the output level by digitally scaling the output to the transmitter's digital- to-analog converter. Turn-on Sequence Transmitter turn-on sequence times are shown in Table 3. Receive Dynamic Range The receiver satisfies PSTN performance requirements for received line signal levels from 0 dBm to -43 dBm measured at the Receiver Analog Input (RXA) input. An external input buffer must be supplied between RXA and LINEIN. The default values of the programmable Received Line Signal Detector (RLSD#) turn-on and turn-off threshold levels are -43 dBm and -48 dBm, respectively. The RLSD# threshold levels can be programmed over the following range: Turn on: -10 dBm to -47 dBm Turn off: -10 dBm to -52 dBm Automatic Adaptive Equalizer An adaptive equalizer in ITU-T V.33, V.17, V.29 and V.27ter modes compensates for transmission line amplitude and group delay distortion. Receiver Timing The timing recovery circuit can track a ±0.01% frequency error in the associated transmit timing source. Carrier Recovery The carrier recovery circuit can track a ±7 Hz frequency offset in the received carrier. Turn-off Sequence Transmitter turn-off sequence times are shown in Table 4. Clamping Received Data (RXD) is clamped to a constant mark whenever RLSD# is off. V.23 Full-Duplex Features The modem can transmit and detect Break signals (continuous Space). The Mark and Space frequencies are 1300 and 2100 Hz, respectively, for 1200 bps, and 390 and 450 Hz, respectively, for 75 bps. Additional features include an optional host programmable Receive Compromise Equalizer for V.23 1200 bps reception and Caller ID mode. Default transmitter turn-on/turn-off sequence times are 10.5 ms (RTS On to CTS On) and 2.2 ms (RTS Off to CTS Off). |
同様の部品番号 - FM214 |
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同様の説明 - FM214 |
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