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

Qualcomm is testing 5G network performance.

In recent months, there has been a lot of information about the maximum speeds that can be offered by 5G networks. But how far is it from theory to practice? This question is answered by Qualcomm, which conducted simulation tests of 5G cellular connections during Mobile World Congress. If real results are at least half as good as those obtained during the tests, we do not have to worry about the future of mobile Internet. The tests conducted by Qualcomm modeled real conditions in Frankfurt and San Francisco based on existing cellular networks and spectrum allocations in the both cities. Simulation factors taken into account included various locations and requirements of network users and a wide range of devices with different levels of LTE and 5G connectivity, operating at different speeds. This is important because simulations usually cover only ideal or uniform conditions. The assumptions made by Qualcomm were much closer to real environments.

The result of San Fransisco simulation for 10 percent of users.
On the left, the download speed for LTE Cat 9, on the right the simulation result for the 5G network.

The simulation of Frankfurt conditions was performed for a basic network operating in 100 MHz channel at 3.5 GHz. The web browsing speed was 490 Mbps on average. This was a huge jump in relation to the average speed of 56 Mbps for simulated 4G users. The download speed also significantly improved, with over 90 percent of 5G users reaching at least 100 Mbps, compared to 8 Mbps in the case of LTE/4G.

During the San Fransisco simulation, Qualcomm modeled a network operating in 800 MHz channel in the 28 GHz millimeter band. The "deployment" was based on the use of the existing network of base stations operating in the licensed LTE bands (except for License Assisted Access, LAA). The average browsing speed increased to 1.4 Gbps, and the average download speed was 442 Mbps.

How the simulations conducted by Qualcomm reflect in the real world we will be able to see in the next few years.

Viewing surveillance video on multiple monitors.

Larger video surveillance systems should provide access to surveillance video for a number of users in different locations. A solution that gives access to any video channels on several monitors can be based on a computer with a suitable number of video outputs and running iVMS-4200 software. The application supports displaying images on up to 4 monitors. The image on each monitor can be freely configured.

A video monitoring system with multiple monitors connected to PCs running iVMS-4200 app

Video from IP security cameras distributed in (S)MATV and CATV systems.

IP cameras do not generate video signals but data streams. The information cannot be distributed to televisions with the use of typical modulation methods employed in the case of analog cameras. The injection of the video information from IP CCTV cameras into an RF distribution network (a private or shared antenna system, CATV network etc.) requires application of intermediate devices. So far, the most popular solution has been the use of digital HDMI - DVB-T modulators (capable of transmission up to Full HD 1080p / 60 Hz). The HDMI signal carrying the video information from one or a number of IP cameras is available at the monitor output of the IP NVR in the IP CCTV system. In the case of one HDMI signal, it is sufficient to use a single channel HDMI to DVB-T modulator, otherwise one will need a multi-channel HDMI to DVB-T modulator (max. 4 channels). However, when the investor wants to have separate images from the cameras, the number of the channels is limited by the number of independent HDMI outputs in the NVR(s). And what about the situation when the number of the IP cameras that should independently provide the video and sound information is much higher, e.g. 12?

DIPOL offers IP (100/1000 Mbps) to 4x DVB-T transmodulator mix-440 R81611. The newest firmware version of the device, 2.04, has been extended with conversion of RTSP streams from IP cameras to DVB-T COFDM standard. This functionality enables the addition of information from IP cameras, encoded in H.264 or H.265 standard, into TV distribution systems, without a need for other devices (NVRs and DVB-T modulators).

Mix-440 R81611 converts IP stream provided in UDP/RTP protocols (unicast/multicast SPTS and MPTS transmissions) and RTSP stream (from IP cameras) to DVB-T COFDM standard

Direct conversion of signals from IP cameras into DVB-T channels distributed to multiple televisions

Mix-440 R81611 can create four DVB-T multiplexes (MUXes), each with a maximum throughput of 31.66 Mbps, which is sufficient for the support of 12 Full HD IP cameras. In this case, each MUX should transmit signals from 3 Full HD IP cameras. The number of supported IP cameras is limited both by the capacity of the processor and the maximum throughput of each DVB-T multiplex (ca. 31 Mbps). The device has been tested only with HikVision IP cameras.

Saving screenshots from cameras in Hikvision IP NVRs of I series.

Hikvision IP NVRS of I series, e.g. DS-7608NI-I2 K22083, can save screenshots from cameras according to a schedule or as a response to an alarm event. In each case the administrator can set the time interval between the captured screenshots from 3 seconds to 24 hours. The screenshots are based on video data provided by the secondary stream. This functionality of the NVRs can be used e.g. for documenting a building's construction progress. After setting up continuous recording throughout all days of the week, the screenshots can be captured all day round at specified intervals. It is possible to define up to 8 time periods for each day of the week and specify the mode of operation in each period (continuous, triggered by motion detection or other alarm event).

Configuration of "Capture Schedule" in DS-7608NI-I2 K22083 NVR

Selecting accessories for a RACK cabinet.

At www.dipolnet.com we offer a simple mechanism that provides a list of compatible accessories for the selected RACK cabinet. When choosing accessories for RACK cabinets, the customer should pay attention to their compatibility with the specific models of the cabinets. Some components may be dedicated to other models, e.g. with greater depth or with a different way of mounting the accessory (e.g. a fan).

The user should simply open the site with the required RACK cabinet, e.g. R912018, and then click on the "Add accessories" button in the right section (in the picture below the button is surrounded by a red line).

The "Add accessories" button on the product page

The new window shows the list of compatible accessories:

The simple configuration tool for RACK cabinets

Combining single-mode devices into multimode systems.

It often happens that installers have to employ single-mode devices in optical installations based on multimode fibers, or sometimes there can be the opposite situation. Such situations are usually caused by implementations of optical systems in stages, often by different contractors.

In most cases, the connection of incompatible network components results in the lack of optical signal on the other side of the optical link. The solution to this problem would be, of course, the application of the suitable device or replacement of the cable, but generally such situations are caused by the fact that it is impractical or impossible and can usually be used only in the case of devices with optional, replaceable SFP modules. But what if the available device has only a fixed optical interface in the incompatible version? Then the installer can employ the optical media converter ULTIMODE MT-202G L1573 that converts optical signals between single-mode and multimode networks. The converters usually have to be installed on the both sides of the link (see the diagram below).

A single-mode device (switch) is connected to the L1573 converter via a single-mode patchcord.
The optical signal converted into a multimode version is transmitted over the existing multimode link
and then converted again to the single-mode version by another L1573 converter.

Single-cable TERRA dSCR multiswitches - Unicable technology. The new dSCR series of multiswitches from TERRA employs single-cable technology (Unicable) that allows for distribution of DVB-S/S2, DVB-T, DAB and FM signals via single coaxial cable. The dSCR acronym means digital Satellite Cable Router, sometimes called channel stacking switch, which converts the received satellite signals to so-called user bands (UBs) that can be received by the connected receivers compliant with the technology. The converted transponders are combined and sent via the single coaxial cable to all the receivers. The communication between the dSCR multiswitch and the receivers uses special protocol defined in the EN50494 (Unicable I) and/or EN50607 (Unicable II) standard, with DiSEqC commands. The biggest advantage of the single-cable system, along with simpler installation of the cabling, is the ability to easily split the signals, similarly to terrestrial TV/radio signals. This also means the possibility to adapt installations distributing terrestrial television signals to the reception and distribution of satellite channels (the number of users connected to one dSCR multiswitch is limited by its characteristics)... >>>more

The diagram above shows an example installation based on TERRA dSCR
cascadable single cable multiswitches SRM-521 R80521

Remote control and video monitoring