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Digital headends distributing satellite channels converted to DVB-T COFDM form have become popular solutions in hotels. TERRA system has been designed for building TV distribution installations providing signals to standard televisions with built-in DVB-T tuners and allowing reception of terrestrial (DVB-T) and satellite (DVB-S/S2) channels ...
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Details
Terra TDX-4168 R81625 transmodulator is used for reception of 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 DVB-S/S2 (8PSK/QPSK) satellite channels and convert them to DVB-T (COFDM) channels. One TDX-4168 R81625 panel can receive all channels from 16 satellite transponders and convert them into two independent groups with four neighboring DVB-T multiplexes (each multiplex with maximum throughput of 31.66 Mbps.
In practice, each multiplex 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 the eight DVB-T multiplexes. Each DVB-T multiplex can be programmed from satellite channels coming from two different satellite transponders. In each case, it is necessary 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.
In practice, each multiplex 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 the eight DVB-T multiplexes. Each DVB-T multiplex can be programmed from satellite channels coming from two different satellite transponders. In each case, it is necessary 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-4168 R81625 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).
Key features
- conversion of DVB-S/S2 signals from 16 satellite transponders to eight DVB-T COFDM multiplexes,
- TDX-4168 creates two independent groups of 4 neighboring DVB-T multiplexes (eight DVB-T MUXes, each with max throughput of 31.66 Mbps),
- built-in remultiplexer allowing for free selection of channels in DVB-T multiplexes,
- selectable channels and services (filtering),
- easy control via RJ-45 port,
- management via the Internet,
- access to event history (logs),
- automatic gain control (AGC).
View of the configuration window of the TDX-4168 R81625 transmodulator
(incl. main parameters of eight DVB-S/S2 streams: RF level, SNR, VBER/PER, bit rate)
Selection of channels and filtration of services
The TDX-4168 R81625 transmodulator creates two independent groups with 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.
An example of SMATV system. Thanks the application of the SRM-522 R80522 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.
Configuration of DVB-S/S2 (8PSK, QPSK) - DVB-T (COFDM) TERRA transmodulator
(example: tdx-480 R81621)
Specifications
| Product type | Transmodulator | ||
| Name | tdx4168 | ||
| Brand | TERRA | ||
| Conversion | DVB-S/S2--->DVB-T | ||
| RF input | Number of supported transponders | 16 | |
| Number of F-connectors | 2 | ||
| Channels | FTA (uncoded) | Yes | |
| Coded (CI slot) | No | ||
| Specyfikacja techniczna | |||
| RF input | Frequency range | MHz | 950...2150 |
| Power supply/control | 0/13/18 V & 22 kHz, max. 1 A,DiSEqC 1.0, EN50607, EN50494 | ||
| standard | DVB-S/S2 | ||
| Modulation | QPSK, 8PSK | ||
| Symbol rate | Ms/s | 2...45 | |
| Signal strength | dBµV | 55...95 | |
| Impedance | Ohm | 75 | |
| RF throughput - gain | dB | -1 ± 1 | |
| RF output | standard | DVB-T/ISDB-T | |
| Number of DVB-T MUXes | 8 (2 × 4 nearby) | ||
| Modulation | QPSK, QAM16, QAM64 | ||
| Frequency range | MHz | 170...230, 470...862 | |
| Signal strength | dBµV | 90 | |
| Signal pos. adjustment | dB | 0...15 with step 1 dB | |
| Impedance | Ohm | 75 | |
| MER | dB | ≥35 | |
| Channel bands | MHz | 7,8 | |
| Security interval | 1/4, 1/8, 1/16, 1/32 | ||
| FEC | 1/2, 2/3, 3/4, 5/6, 7/8 | ||
| FFT mode | 2K | ||
| Bandwidth | Mbps | 8 × 31,67 | |
| RF combiner | Frequency range | MHz | 47...862 |
| Connector | F | ||
| Loss | dB | 2,5 | |
| General | |||
| Configuration | Port | RJ-45 (web browser) | |
| IP address | 192.168.1.10 | ||
| Remote | Yes | ||
| Current drawn | V/A | DC 12/1.2 | |
| Operating temperature | °C | 0...+45 | |
| Weight | kg | 1,12 | |
| Dimensions | mm | 63 × 198 × 112 | |
