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A DOCSIS transceiver is intended for arrangement of an over-the-air Internet network. It is installed near a combined antenna and is connected with drop cables to a head cable modem (CMTS), for example BSR-1000. The connectors "INPUT"/"ÂÕÎÄ" and "OUTPUT"/"ÂÛÕÎÄ" are connected correspondently to the CMTS forward and reverse channel connectors. A supply voltage of +30...+45V is applied over a central core to the connector "INPUT"/"ÂÕÎÄ". The connector "ANTENNA"/"ÀÍÒÅÍÍÀ" is connected to the antenna with a circular antenna diagram. Quantity of subscribers in the over-the-air network is defined by CMTS performance capabilities and can reach 1000 and more. Data transmission rate to the subscribers of an over-the-air Internet network is up to 37 Mbit/s, data reception rate from subscribers is to 8 Mbit/s (the data are given in case of using a CMTS Motorola BSR-1000). The area coverage radius while having a combined antenna with Gain = 12dB and a subscriber combined antenna is 24dB: for a QAM256 - 8km (with a store for weather conditions of 10dB), for a QAM64 - 32km (with a store for weather conditions of 10dB). Data rate while using a QAM256 - 37Mbit/s, a QAM64 - 27Mbit/s.
Combined Antenna TA-DOCSIS (price 990 nominal dollars). It is intended for operation with the DOCSIS head transceiver. Reception frequency 2300-2320MHz, transmission frequency 2500-2530MHz, SWR<1,5, gain=12dB, horizontal polarization, circular pattern.
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Specification of Transmitting Device
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| Frequency range of output signal arriving to antenna
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2.5 - 2,524 GHz
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| Rated-output power
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0.3 W
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| Frequency range of input signal from CMTS (of forward channel)
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0.470 - 0.494 GHz
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| Input signal power (APM system operation)
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-27...-2 dBm
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| Heterodyne oscillator frequency
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2,030 GHz
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| Heterodyne oscillator frequency departure under the influence of all destabilizing factors not more
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± 3 kHz
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| Out-of-band emission level not worse
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-60 dBc
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| Short-term heterodyne oscillator frequency instability not more
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10 Hz ...
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| Heterodyne oscillator phase noise while tuning out to ± 100 kHz not worse
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-100 dBc/Hz
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| Third degree intermodulation product when output power of each of the two signals is 0.14W not worse
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-50 dBc
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| "INPUT" Input resistance
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75 Ω
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| "ANTENNA" Input resistance
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50 Ω
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| APM System depth not less
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± 10 dB
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| Voltage supply/Power consumption
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+30...+45V / 39 W
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| Readiness time after turning on does not exceed
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5 min
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| Ambient temperature
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-30...+50 î Ñ
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| Relative air humidity
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up to 100%
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| Operation mode
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continuous
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| Weight
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3.5 kg
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| Dimensions
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240x190x105 mm
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Specification of Receiving Device
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| Frequency range of input signal arriving from antenna
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2.305 - 2.325 GHz
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| Frequency range of output signal arriving from CMTS (of a reverse channel)
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28.0625-43.0625 MHz
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| Gain
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30 dB
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| Noise ratio
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5 dB
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| Heterodyne oscillator frequency
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2.276937 GHz
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| Heterodyne oscillator frequency departure under the influence of all destabilizing factors not more
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± 3 kHz
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| Short-term heterodyne oscillator frequency instability not more
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10 Hz
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| Heterodyne oscillator phase noise while tuning out to ± 100 kHz not worse
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-100 dBc/Hz
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| Selectivity over image channel not less
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50 dB
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| Third degree intermodulation product level when output level of each of the two signals is 101.dB/µV not worse
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-45 dBc
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| Ambient temperature
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-30...+50 î Ñ
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| Relative air humidity
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up to 100%
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| Operation mode
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continuous
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| Transmitter signal suppression (2.5-2.524 GHz) by receiver input filter is not worse
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50 dB
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Worsening of SNR in the "DOCSIS transmitter-DOCSIS subscriber receiver" system (in comparison to the "head CMTS modem-subscriber modem" system) is ~3dB (38dB are instead of 41dB for a QAM 256 in the forward channel).
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