Your VSAT equipment comprises of:
a) Outdoor Equipment:
The BUC is used in the transmission (uplink) of your satellite signals. It converts a band (or “block”) of frequencies from a lower frequency to a higher frequency. Modern BUCs convert from the L band to Ku band and C band. Most BUCs use phase-locked loop local oscillators and require an external 10 MHz frequency reference to maintain the correct transmit frequency. . BUCs used in remote locations are often 2, 4 or 8 Watt in the Ku band and 5 W in the C band, depending on the bit rate. A 3 watt TRIA is available, subject to checking suitability for the exact frequency of operation The 10 MHz reference frequency is usually sent on the same feed-line as the main carrier. Many smaller BUCs also get their direct current (DC) over the feed-line, using an internal DC block.
A high stability Phase-lock loop(PLL) receive Low Noise Block (LNB) Is a control system that generates an output signal whose phase is related to the phase of an input “reference” signal. It is an electronic circuit consisting of a variable frequency oscillator and a phase detector. This circuit compares the phase of the input signal with the phase of the signal derived from its output oscillator and adjusts the frequency of its oscillator to keep the phases matched. The signal from the phase detector is used to control the oscillator in a feedback loop.
Interfacility Link Cable (IFL) The Inter-Facility Link (IFL) is the set of coaxial cables that carries IF signals, control signals, and DC power, from the indoor equipment to the outdoor equipment of a satellite earth station and back again.
Antenna Dish Non Penetrating roof top mount, or a Pole mount, the appropriate mount will be advise to secure the antenna dish in to position, at the consultation phase..
b) Indoor Equipment:
We supply and install state of the art modems bt leading manufacturers such as Comtech that use technologically advanced components, innovative designs and proven, novel application software for superior performance and features.
1) Forward Error Correction (FEC) & Modulation The hub Modems support traditional and advanced methods of forward error correction to improve performance of error-prone channels. They are:
SCPC The only way to ensure quality of voice and video service delivery.
DVB-S2 Provides near Shannon Limit performance over a wide operating range Low Density Parity Check Coding â€“ Enables near Shannon limit performance and additional coding gain.
2nd Generation Turbo Product Coding Offers much lower delay than legacy FECs.
Selective Time Division Multiple Access with slotted or free running Aloha channel assignment to minimize bandwidth on the return path for network clusters.
Fast switched SCPC auto sensed from the packet headers, a dedicated SCPC channel will be allocated on demand for Voice or video traffic and for bulk of data greater than the STDMA assignment can manage. Switching is seamless with no interruption to service. They also have ASIC and FPGA modulator and demodulator designs with a range of modulation techniques, including BPSK, QPSK, OQPSK, 8-PSK, 16-APSK, 32-APSK, 8-QAM, 16-QAM and 64-QAM. The combination of advanced FEC and higher order modulation provides increased coding gain, lower decoding delay, plus significant bandwidth and power savings.
2) DoubleTalk Carrier-in-Carrier This allows the transmit and receive carriers of a duplex link to share the same transponder space. When combined with the advanced FEC and modulation, DoubleTalk Carrier-in-Carrier delivers unprecedented savings in transponder bandwidth and power utilization. Therefore, this revolutionary technology can be successfully deployed in both bandwidth-limited and power-limited scenarios. In addition, this technology reduces earth station BUC/HPA power requirements allowing the use of a smaller BUC/HPA and/or antenna.
The Vipersat CDM-570/750 modems can transmit a carrier up to 10 Mbit/s (with 166 Mbits capability available using DVBS-2) which is received by all remote VSATs stations. Your specific VSAT terminal then extracts just the wanted data stream intended for it. The hub is also equipped with banks of demodulators for each inbound carrier (either pre-assigned or on demand, from a remote site that requires it. Return link carrier sizes may be from 2.4kbit/s to 10Mbit/s dedicated continuous SCPC bit rates.
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