DIPOL Weekly Review - TV and SAT TV, CCTV, WLAN
No. 26/2015 (Aug. 31, 2015)
"Power Over Wi-Fi" closer and closer. Is it possible to get Internet connection via Wi-Fi and use the same medium to charge the battery of a mobile device at a distance? Such a solution is being developed by researchers from the University of Washington. Their "Power Over Wi-Fi" system can wirelessly charge batteries located up to 8.5 meter from an AP, in this case a WI-Fi router. The system consists of two parts, one of them is the AP with modified software allowing for operation both as wireless router and wireless source of energy. The second part is a custom-made sensor that receivers the RF energy and converts it into DC power. The both parts create an innovative system capable of charging the battery of the sensor via the Wi-Fi router.
As noted by Popular Science, an American magazine, Energous company already sales devices that transmit power via radio waves. The solution, however, requires entirely new, dedicated hardware. The system created at the University of Washington can coexist with a traditional Wi-Fi router or generally an access point which simultaneously provides data access and supplies power to a wireless device, this way utilizing the energy normally generated by the access point to perform its role. Taking into account the main function, i.e. Wi-Fi, there must be a kind of a balance between the transmitted power and the efficiency of data transmission. The team from the American university invented a clever workaround, making sure that the usable RF power and the communication performance are optimized. "If we wanted to just blast as much power as we possibly can, that would kill your Wi-Fi, because you’d have power on the channel all the time," explains Bryce Kellogg, one of the researchers on the project. "We optimized the router so that we can deliver what seems like, to the sensor, constant power without impacting your Wi-Fi too much. Instead of having continuous power on one of your Wi-Fi channels, we split it among your three non-overlapping Wi-Fi channels. That allows us to deliver about the same amount of power without impacting any one channel very much."
The team has already tested their solution, supplying with power temperature sensors, a camera, and rechargeable batteries, at distances 6.1, 5.2 and 8.5 m, respectively. It would be possible to achieve better results, but the Federal Communications Commission (FCC) imposes strict limitations associated with the maximum transmitted power. The tested solution can be seen not only in the laboratory. The university team installed functional systems in six homes in Seattle, using Asus RT-AC68U routers with custom software. So far, none of manufacturers of network devices decided to sign an official contract for the implementation of the idea. The researchers declare further work on the project, which will be perhaps the foundation for the future standardization of this type of function.
Hotel TV system. Owner of a large hotel has chosen S2C16 R81620 headend for reception and distribution of satellite channels. The compact digital headend is a 16-channel transmodulator with DVB-S/S2 (8PSK/QPSK) input and DVB-C (QAM) output. The device is designed for transmodulation of FTA channels. Each of the 16 transmodulators of the S2C16 R81620 headend receives signals from a whole satellite transponder (several to over ten TV channels) and forms the corresponding DVB-C multiplex. In total, the headend can distribute 16 DVB-C multiplexes that can be received by televisions equipped with DVB-C tuners. The TV channels received from a transponder can be freely filtered - the only requirement is not to exceed the maximum output bit rate.
The diagram of the TV system deployed in the two hotel buildings, distributing DVB-T (3 multiplexes) and DVB-C (16 multiplexes, over 100 satellite channels). The signal is split by the R-2 R60102 splitter into two paths. The signal from one path (in the building with the technical room) is directly distributed in a passive network, the signal from the second path is converted into optical form and provided to the other building located 600 m away via a single-mode optical fiber.
The system distributes DVB-T (3 multiplexes) and satellite programming (converted into 16 DVB-C multiplexes, over 100 satellite channels). The signal is split by the R-2 R60102 splitter into two paths. The signal from one path (in the building with the technical room) is directly distributed in a passive network, the signal from the second path is converted into optical form and provided to the other building located 600 m away via a single-mode optical fiber. This function is performed by TV optical transmitter Terra mo418 4D31 R82522 with output optical power of 6 dBm. The transmitter and DR-60-12 12V/4.5A R82532 power supplier have been mounted on DIN rail R82538. In the second building, the optical signal is converted into RF form by TERRA OD-002 R81726 optical node. The maximum output level of 106 dBµV is sufficient for distribution of the RF signal in the second building without using additional amplifiers, via passive network based on Triset-113 E1015_500 coaxial cable.
How to distribute HDMI signal via coaxial cable? The H3609 HDMI extender allows for transmission of HDMI signal over long distances via 75 ohm coaxial cable. The extender kit consists of transmitter, receiver, and two AC/DC adapters. In order to provide the HDMI signal to several TVs/monitors, the output signal from the transmitter should be split by a typical TV splitter. Each of the paths has to be terminated with the dedicated receiver.
Point-to-multipoint distribution of HDMI signal
To establish the connection between the transmitter and receiver, the user must select the same channel in both units (there is a choice among 100 TV channels). The width of the channel is 7 or 8 MHz (depending on the channel number). The selected channel can be injected into an existing antenna system, on the condition that it ensures necessary spacing to other channels used in the system.
The kit is perfect for connecting remote HD source like sat receiver, Blu-ray player, PC, game console etc. to HD-enabled TV/monitor/projector. It requires the use of only one, comparatively thin cable, which can be easily hidden (along with the HDMI receiver) when installing the TV/monitor on an LCD mount.
IP video surveillance system for a housing development. The growing popularity of CCTV systems based on IP protocol, combined with the distance limitations of Ethernet networks with twisted-pair cables (the need for an active device/hub after each 100-meter-long link) is the reason that installers increasingly adopt solutions employing fiber optic technology.
When selecting equipment for this type of installation, it is worth to have comprehensive approach to the system in order to limit the number of devices used. For example, a suitable and properly configured model of the network switch can perform not only the function of the switch but also of the power supply for IP cameras and of the media converter (e.g. via an SFP module installed in the dedicated slot). However, it happens that SFP modules from some manufactures have compatibility problems with switches from other producers, despite the same standard. Ultimode SFP modules are fully compatible with Ultipower switches.
The architecture of IP CCTV system combining copper and fiber optic cabling
In the diagram above, 12 IP cameras Sunell SN-IPR54/14APDN K1685 are connected to 3 switches Ultipower N29983. The switches power the cameras with the use of PoE and enable transmission of the surveillance data to the server room via optical links. This function is performed by gigabit SFP modules Ultimode L1415 installed in the slots of the switches, each cooperating with two single-mode fibers. The video data is recorded by Hikvision DS-7608NI-E2/A K22081 NVRs. Thanks to the cooperation between two leading CCTV manufactures, Sunell and Hikvision, the devices of the both companies are fully compatible.
Autonomous building automation system based on ROPAM devices. ROPAM company offers extensive systems for intelligent homes, with building automation components and means for transmission of control signals. Aside from wireless means, which have limitations in some environments and applications, ROPAM provides a solution that transmits the signals via the existing 230VAC power network. This solution guarantees high reliability and eliminates wireless range problems. The control signals can be transmitted over any phase wire of the AC wiring and between them.
The system consists of the Hub-SimplePLC-D4M G7172 hub, input expander EXP-I8-RN G7051 or EXP-I8-RN-D4M G7053, output expander EXP-I8-RN-D4M G7054 and intelligent switches IO-SimplePLC G7182. The communication between the hub and expanders is performed via RopamNET bus, whereas the data exchange between the hub and intelligent switches takes place via the 230 VAC power network. The state of expander inputs is transmitted via the hub and SmartPLC platform to the dispersed IO modules. The state of the inputs of IO modules is provided to outputs of the expander. The IO-SimplePLC modules are equipped with remotely controlled two-state output (10 A / 250 VAC), two-state input (ON/OFF), potential input (N/L), for local control by a 230 VAC push-button or single-pole switch.
The states of the inputs of the input expander are duplicated by the switches with the same addresses (input no.1 controls the switch programmed as no.1 in the hub etc). The states of the inputs of the remotely controlled switches (that can also be controlled by local mechanical latching/non-latching switches) are duplicated in a similar way on the outputs of the output expander.
The SmartPLC technology opens up new possibilities for "intelligent homes", allowing for easy deployment of alarm installations integrated with building automation systems and for control of electrical devices (lighting, any appliances connected to electrical outlets) using the existing electrical wiring as the communications bus. There is no need for additional cables or application of wireless means. With the ability to provide information from each remote switch to the output expander, the entire system can be integrated with any existing or new alarm system. The system can be used, for example, to control lighting and any devices connected to the relay outputs in a distant farmhouse, garage, etc., to open/close a gate, to water a lawn etc.
An autonomous home automation system integrated with burglary alarm
Hikvision company - the number 1 in the world. According to the latest report from IHS, a global information company, Hikvision has strengthened its leading position in the production of equipment and accessories for CCTV, and again takes the first place in this field, the fourth year in a row. The company is the first industry player, with over 16% share of the market and the sales increase of 50% compared to last year and of 100% in relation to the level of two years ago.
The company has the largest share in the market of DVRs recording video from analog cameras (26.3%) and in the field of megapixel cameras (20.6%). Thanks to compliance with ONVIF and continuously increasing reliability of the manufactured NVRs, Hikvision is also quickly growing in this market segment (more than twofold increase compared to the last year).
ULTIPOWER 114P-4POE-20 industrial PoE switch N29972 enables data transmission at rates of 10 Mbps and 100 Mbps. Its four RJ45 ports support auto-negotiation and Power over Ethernet (PoE) functions. The device automatically discoveries PD devices (Power Device) compliant with IEEE 802.3af standard and supplies power to them. This way, it is easy to power network devices located in places without access to AC lines, such as access points, IP cameras, IP phones etc. The switch has been equipped with optical converter allowing for transmission over a distance up to 20 km.
Professional Satellite dish INVERTO IDLB-STCF 120 cm A9648 with 42.3 dBi gain ensures reliable reception of HD channels even in adverse weather conditions. The reflector of the dish is made of galvanized steel and is powder-coated with polyester paint (light color). The both layers provide excellent protection against corrosion, UV radiation, mechanical factors. The mounting elements and LNB arm (for neck diameter of 40 mm) are made of aluminum. The precise construction of the dish guarantees very good C/N ratio and is resistant to the influences of the wind.
Signal HDMI Extender (Cat.6/60m/IR) H3612 allows for transmission of HDMI signal over a distance of up to 60 meters via minimum Cat. 6 twisted pair cable. There is also a possibility of IR remote control extension. The extender kit consists of transmitter and receiver units. The set is perfect for connecting remote (up to 60 m) HD source like sat receiver, Blu-ray player, PC, game console etc. to HD-enabled TV/monitor/projector.
August 31, 2015 - promotion of LTE filters. Digital Dividend is the 790-862 MHz frequency range (often called 800 MHz band) released in the process of digital television transition. In Europe and some other regions, the freed band is made available for electronic communications services, i.e. broadband LTE services provided by mobile operators. The services may cause problems for the users of DVB-T whose antennas are placed near the transmitters of the LTE 800 system, especially when their antenna installations have not been adapted to the narrower band (below 790 MHz). Strong LTE signals induced in the antennas may lead to overdriving antenna amplifiers or TV tuners, making it impossible to receive some DVB-T multiplexes.
Cable attenuation compensation in multiswitch systems. The coaxial cable attenuation increases with frequency. This means that higher TV channels and especially satellite broadcasts converted into higher SAT IF frequency ranges are attenuated more than those transmitted in the lower bands. This effect can be compensated by a gradual increase of the gain for higher frequencies - the TERRA SA series of multiswitches has been equipped with adequate mechanisms. Since the attenuation characteristics of various cables can differ, the so called "Slope" parameter is adjustable (it should take values appropriate for specific cable types/brands) with potentiometers or switches. As the result, the gap between the signal levels of the lowest and highest channels or frequencies in subscribers' outlets is minimized. The graphs below show the difference in signal levels in a subscriber outlet (cable length of 70 m) before and after using the compensation mechanisms implemented in the SA-901 R70901 amplifier ... >>>more
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No. 25/2015 (June 22, 2015)
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