DIPOL Weekly Review – TV and SAT TV, CCTV, WLAN

DVB-I alternative to DVB-T2 and DVB-S2? Germany says "now checking".

Huge interest from the media industry, German broadcasters, equipment manufacturers and software providers has led to intensive work in Germany to implement a standardized DVB-I standard. The project, which involves 19 organizations, aims to develop a consistent DVB-I system and eliminate its current shortcomings. At the moment, the greatest drawback of streaming is the long delay in transmission, which ranges from tens of seconds to even a few minutes. In the case of terrestrial, satellite or cable TV, delays reach only a few seconds. This makes streaming, for example, sporting events a big problem, as some viewers learn about a goal from the reaction of their neighbors and not from the TV screen. Another important aspect is the creation of a common list of services from different providers. For this purpose, a so-called aggregation service has been developed, which generates a national list of services for individual providers. To do this, each provider sends its list to the aggregation service's API. The service verifies technical consistency and adds it to the national service list. Regions and LCNs (logical channel numbers that define the order of services) are maintained separately in the aggregation service, so uniformity is ensured. Electronic program guides, on the other hand, are provided in a distributed manner, allowing each provider to provide up-to-date data without buffering or latency problems.

DVB-I was created to allow easy access to video streaming of linear programs over the Internet. The most important task now is to agree on a common understanding of the DVB-I standard with the participation of all market players involved. So far, not everyone realizes that we have a special opportunity here to prepare TV for the future. The pilot project has a limited duration and, for the time being, it does not include a launch decision in Germany.

DVB-T/T2 antennas of the SMART series – which one to choose?

Installer working in unknown regions often have several DVB-T/T2 antenna models to choose from – the ones with combiners and preamplifiers, installed in antenna boxes, if needed. Taking appropriate measurements with a special meter the optimum antenna for the location can be selected. What about customers wishing to choose and install TV antennas themselves? Unfortunately, they have had to take chance so far – to buy a passive version of the antenna and, if necessary, buy a preamplifier. Both in the case of the installer and the customer buying the antenna themselves, it was far from ideal solution.

Using DIPOL SMART antennas the installer avoids troublesome replacement of the combiner for preamplifier and testing reception in different configurations. For SMART antennas, testing of various options is performed by switching on and off the power supply of the preamplifier at the meter. The installer can immediately verify whether additional boosting of signal level is needed in a specific location, and the final signal parameters offered by the antenna.

What is the maximum HD- CVI signal transmission range?

The HD-CVI system enables recording and transmission of high-resolution analog video over coaxial cable or twisted pair (after using special video transformers). Its key advantages include:

Improving the coverage of cell phone networks at home.

As a result of high attenuation of walls and windows, the cell phone signal is often too weak inside the home to make calls comfortably over the phone.

The solution to the problem can be the GDW-505 A6777 device which is used to amplify the GSM, DCS, 3G, LTE signal and bring it indoors. The repeater has to be connected with an external antenna, directed towards the base station of the operator, and to an internal antenna which will distribute the amplified signal.

In the deployment of indoor antennas one should pay attention to the number of rooms to be covered by the amplified signal and their surface area. During the installation it is important to keep in mind the long distance between the indoor and outdoor antennas (at least 5 m if there is an obstacle in the form of a ceiling or roof). In the case of roof installation, you should start from the lowest level as it is possible to cover two floors with a single antenna. Dipol has three antennas dedicated for signal repeaters. These are TRANS-DATA brand antennas: the A741001, A741002 and A741021 models.

Terminating telecommunication systems in apartments.

Typical good practice is to locate a suitable installation box in each apartment near the entrance door. Multipurpose installation boxes can be used for any kind of cabling and services.

The OMT-35 R96025 flush-mounted cable box is intended both for apartments in multifamily buildings and single-family homes. It is suitable for copper wiring (twisted pair cables, TV coaxial cables) and optical fibers, in any configuration. The box is divided into three compartments: a smaller one for keeping spare cables, a larger one to place passive (e.g. TV/SAT splitters) and active (RF amplifiers, cable modems) components of the home system, and an intermediate panel carrying connectors/adapters.

The panel is equipped with Keystone holes, so it is possible to use universal connectors of this type, usually in the version with an RJ-45 socket. In case the termination of the TV cabling (coaxial cable) and fiber optic cable is to be done with standard adapters, dedicated holes in the panel can be used for this, where F-F adapters and fiber optic adapters can be installed.

DIPOL's portfolio also features other models of home junction boxes. Which will work best for you depends on the size of the casing, the mounting type of cable-termination connectors, the availability of a 230 VAC outlet, and the available space for spare cables.

Selective amplification of DVB-T2 multiplexes in SMATV systems. In terrestrial SMATV systems in multi-family buildings, hotels, public facilities with dozens and more outlets, broadband amplifiers should be avoided at the input of the system. In such cases, it is recommended to use channel amplifiers allowing to equalize the levels of all multiplexes...>>>more