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

Gigabit WiFi!?

In early April, Qualcomm announced that after several years of work it developed network systems employing MU-MIMO technology. The chipset manufacturer plans to sell its network systems to producers of tablets, smartphones, routers and access points. The first device should appear in stores in early 2015. This means that in a year we will be able to purchase consumer devices offering significantly higher wireless transmission speeds.

MU-MIMO (Multi-User MIMO) is a development of MIMO 3x3 and 4x4 techniques used, among others, by the 802.11n and 802.11ac standards. The latter one debuted on the market in early 2012 (Broadcom chipset). Using this standard and the techniques, selected models of mobile devices, such as notebooks, tablets, and smartphones use data transmission in 5 GHz band, with 80 MHz bandwidth and 256-QAM modulation. The real transfers reach as high as 600/900 Mbps (adequately for TCP/UDP, MIMO 3x3).

The second generation of the 802.11ac standard expands the RF bandwidth used up to 160 MHz and uses MU-MIMO technology. This allows the devices with Qualcomm chipset to reach data transfers at the level of 1.7 Gbps.

Unfortunately, at the beginning none of the chipsets will allow the use of the 160 MHz bandwidth, but some will support transmission by 4 streams, reaching a maximum speed of up to 1.73 Gbps.

Joint box - full protection of optical connections.

Installation of fiber optic networks outside buildings is not complicated if the installer has the appropriate equipment and accessories. The key to stability and reliability of the connections and links is the use of appropriate protective measures for the splices, splitters, adapters, connectors.

In the case of using poles, the ideal solution is the application of the ULTIMODE HMS-V24-A L56124 vertical straight-through joint boxes. The box protects fiber optic splices from mechanical damage and adverse effects of weather conditions. Its universal construction allows for use in various applications, including optical line splitting and repairs of damaged cables. The joint box can protect up to 24 fusion splices (4 splice trays, each of capacity of 6 splices). It can be mounted on poles, posts, facades etc. The cables entering the box from the bottom are secured by the attached heat-shrinkable films, and the protection from the top is guaranteed by the one-piece construction of the upper part.

There is also a version for 96 splices, ULTIMODE HMS-V96-A L56096.

Multiswitch SMATV systems for 300 users in Bierun, Poland.

The diagram below (click on to enlarge) shows the design of an independent SMATV system installed in each of five multifamily buildings in the town. Each of the buildings has 60 apartments and the users get access to satellite channels from two satellite positions, Hotbird 13.0E and Astra 19.2E, and to terrestrial broadcasts - DVB-T channels and FM radio signals. Every building SMATV system consists of the master antenna set with satellite dish with a diameter of 110 cm A9658 equipped with two QUATRO LNBs A98266, terrestrial TV antenna DIPOL 44/21-69 TRI-DIGIT A2670, FM antenna A0221, a set of ALCAD channel amplifiers, and RF distribution network based on multiswitches. The multiswitches come from the TERRA MSV series. All the systems have been installed by the E-SBL.NET SP. Z O. O, CHELM SLASKI company.

Diagram of the multiswitch SMATV system installed in each of the 5 apartment buildings

The TERRA MSV multiswitches have been chosen by the investor and installation company due to a number of features:

CCTV system in a restaurant.

Marin Seafoodgrill restaurant is located in the historical part of Bucharest, the capital of Romania. The restaurant specializes in grilled fish and seafood. In order to reduce the risk of theft and increase the security of guests and employees, the owner decided to install a video monitoring system. The system has been installed by the Dipol Connect company.

The video surveillance system in the restaurant is working around the clock. The monitored places include cash desk, dining room, the entrance to the restaurant and the parking lot. The usefulness of the system is particularly evident during the dinner rush. With a crowd of customers, the risk of fraud and theft is at the highest level at that time.

The indoor parts of the restaurant are monitored by v-cam 450 M10749 and u-cam 650 M11194 cameras, the entrance and the parking lot are observed by n-cam 570 M11265 cameras.

The video from the cameras is transmitted to the DVR via Netset E1408 UTP cable, with the use of baluns Etrix M16654 and M16655. As regards the DVR, the owner and installation company have together chosen Ultimax 1404 M72404. The important factors were operating reliability, image quality and the capability of remote configuration and access.

Video surveillance system in a town.

The center of the small town (ca. 10000 residents) is open to vehicular traffic. The CCTV system is to increase the safety in the area and help the police and municipal authorities. The operators monitor the images in 24/7 service mode and should detect any signs of abnormal behavior: fights, vandalism, or improper parking. The recordings should help to identify the participants of fights, perpetrators of petty theft, pickpockets etc.

The best solution in this type of installations is megapixel wireless IP CCTV system with a monitoring center managed by operators who can perform live monitoring, exert PTZ control, play back archival recordings and transfer them to law enforcement authorities. The CCTV system consists of IP cameras - 2 MP PTZ cameras SN-IPS54/80DN/Z22 K1666 , and 2 MP box cameras SN-IPC54/14EDN K1634 equipped with Clear HD M2280 lens and placed in Marathon housings M5406.

The system comprises a number of base stations wirelessly connected with the cameras via ULTIAIR devices (point to point links). Base stations are connected to the monitoring center located in the premises of the Municipal Police. The operator of the systems uses 8-channel NUUO software allowing for managing the system, monitoring, recording, and playing back the images from the cameras.

Too high temperature?

Multiple devices placed in a RACK cabinet can emit a significant amount of heat. It is important that the temperature inside the cabinet is in the acceptable range. The temperature can be stabilized by installing fans controlled by a thermostat.

Thermostat mounted on DIN rail (0...60°C)
R912006

Fan panels for standing Signal RACK cabinets:

Universal diagrams of CCTV systems. The case studies present basic CCTV systems, analog, hybrid, and IP. These are examples of video surveillance systems for homes, stores, parking lots, towns... more.

April 10, 2014 - the end of SECUREX 2014 trade fair. Thank you for your visits to our stand at Securex 2014. We hope that our offer has been interesting for you. Realizing that it is impossible to show all details during such events, feel free to contact us. A report from the fair is available here.

Distribution of television signals via fiber optic cables. Transmission of television signals via coaxial copper cables at distances exceeding a few hundred meters is not an easy task. Of course, the loss can be compensated by a cascade of amplifiers, but the distribution method has its limitations and the use of active devices increases the cost of the entire system. Due to the fact that the cost of typical fiber-optic cables with four fibers is comparable with the price level of high-quality copper cables, it is worth to consider application of the optical medium. Its capability of transmission over very long distances and full electrical isolation between nodes make the main advantages of fiber optic systems... more

Distribution digital DVB-T signals (4 multiplexes)
to four buildings via single-mode fibers