Headends
Transmodulators
DVB-S/S2 (8PSK, QPSK) to 8xDVB-T (COFDM) Transmodulator: TERRA TDX-480 (FTA)
Code: R81621
4-year warranty
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Views of the DVB-S/S2 (8PSK, QPSK) to 8xDVB-T (COFDM) TDX-480 R81621 transmodulator
View of the included accessories - wall mount, distance lath, RF bridge, termination load resistor
Key features
- conversion of DVB-S/S2 signals from eight SAT transponders to eight DVB-T COFDM multiplexes,
- creation of two independent groups of four neighboring DVB-T multiplexes (in total - eight DVB-T MUXes, each with max throughput of 31.66 Mbps),
- built-in remultiplexer - possibility to create multiplexes with any selection of channels
- selectable channels and services,
- easy configuration and control via RJ-45 port,
- management via the Internet,
- access to event history (logs),
- automatic gain control (AGC).
Terra TDX-480 R81621 DVB-S/S2 to DVB-T transmodulator is used for reception of FTA DVB-S/S2 (8PSK/QPSK) signals, selection of desired channels and retransmission of them in COFDM format in chosen RF channels in VHF/UHF frequency range. The device allows the user to receive and manage a range of free to air satellite channels. One TDX-480 R81621 panel can receive channels from eight satellite transponders and convert them into two groups of four neighboring DVB-T multiplexes with maximum throughput of 31.66 Mbps (no PID filtering). In practice, each of the eight multiplexes can carry 6 SD channels or 2-3 HD channels. The administrator of the system selects the required channels from the satellite streams and forms eight DVB-T multiplexes. Remultiplexing the streams, it is neceeesary to remember about 10% safety margin when determining the maximum bit rate for the whole multiplex (typically the ultimate bit rate of a multiplex should not exceed 29 Mbps). The output DVB-T COFDM multiplexes are usually distributed to users by a passive network composed of RF splitters/taps. Such a solution is especially convenient in modern hotel TV systems distributing a variety of satellite channels, including HD broadcasts.
Thanks to RJ-45 Ethernet port, the programming of the TDX-480 R81621 panel is performed via a web browser.
A great advantage of the Terra device is easy integration with other components:
- dSCR/Unicable multiswitches, allowing for independent distribution of DVB-S/S2 channels via one coaxial cable,
- IPTV streamers for management and distribution of satellite, terrestrial and cable DVB channels within Ethernet (LAN) networks based on twisted-pair cabling,
- optical transmitters for transmission TV programming via optical links,
- other receiving and signal processing devices (broadband and channel amplifiers, analog and digital modulators).
View of the information window of TDX-480 R81621 module
(among others DVB-S2 input RF levels, SNR, VBER parameters)
Selection of channels and filtration of services
The TDX-480 R81621 transmodulator creates two independent groups of four neighboring DVB-T multiplexes. With these parameters, the maximum bandwidth of each of the eight DVB-T multiplexes is 31.66 Mbps, in compliance with the DVB-T standard.
Specifications:
| Name | TDX-480 (FTA) | ||
| Code | R81621 | ||
| Number of supported transponders | 8 | ||
| RF inputs | Frequency range [MHz] | 950 - 2150 | |
| LNB power and control | 0/13/18 V, max 500 mA, 22 kHz, DiSEqC 1.0, EN50607, EN50494 | ||
| Level [dBμV] / Impedance [Ω] | 55-95 / 75 | ||
| RF loop gain [dB] | -1 ± 1 | ||
| Standard | DVB-S/S2 | ||
| Modulation | QPSK, 8PSK | ||
| Symbol rate [Ms/s] | 2...45 | ||
| Return loss [dB] | ≥ 10 | ||
| Number of inputs | 2 | ||
| RF output | DVB standard | DVB-T | |
| Level [dBμV] / Impedance [Ω] | 90±2 / 75 | ||
| Freq. range [MHz] | 170-230 MHz / 470-862 MHz | ||
| Number of DVB-T MUXes | 4 neighboring + 4 neighboring | ||
| MER | ≥ 35 dB | ||
| Modulation | QPSK, QAM16, QAM64 | ||
| Channel width [MHz] | 7 or 8 | ||
| Guard interval | 1/4, 1/8, 1/16, 1/32 | ||
| FEC | 1/2, 2/3, 3/4, 5/6, 7/8 | ||
| FFT mode | 2K | ||
| Output level adj. [dB] | 0...-15 (step 1) | ||
| Transport Stream | Max. bitrate [Mbps/s] | < 31 | |
| Service filtering | Yes | ||
| General | RF loop (band / loss) | 47-862 MHz / ≤ 2.5 dB | |
| Ethernet port (RJ45) | IEE802.3 10/100 Base T | ||
| Power [V] / [A] | 12 / 1.1 | ||
| Oper. temperature range [ºC] | 0...45 | ||
| Dimensions [mm] / Weight [kg] | 48.5x198x112 / 0.9 | ||
An example of SMATV system. Thanks the application of the SRM-521 R80521 multiswitch, the system can distribute satellite channels selected from the whole Ku band (11.7 ... 12.75 GHz).
DIPOL offers the following transmodulators of DVB-S/S2 (8PSK, QPSK) signals:
| Model | TDX-410C | TDX-420 | TDX-420C | TDX-440 | TDX-480 |
 |  |  |  | | |
| Code | R81617 | R81618 | R81619 | R81614 | R81621 |
| Input signals | DVB-S/S2 (8PSK, QPSK) | DVB-S/S2 (8PSK, QPSK) | DVB-S/S2 (8PSK, QPSK) | DVB-S/S2 (8PSK, QPSK) | DVB-S/S2 (8PSK, QPSK) |
| Number of transponders | 1 | 2 | 2 | 8 | 8 |
| Output signals | DVB-T COFDM | DVB-T COFDM | DVB-T COFDM | DVB-T COFDM | DVB-T COFDM |
| Number of MUXes | 1 | 2 | 2 | 4 | 8 |
| Max. bit rate [Mbps] | 31.66 | 2x31.66 | 2x31.66 | 4x31.66 | 8x31.66 |
| CI slot | 1x | No | 2x | No | No |
Customers can also order DVB-S/S2--> DVB-C (QAM) transmodulators.
DVB-S/S2 (8PSK, QPSK) to 8xDVB-T (COFDM) Transmodulator: TERRA TDX-480 (FTA)
Code: R81621
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