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

A major breakthrough in technology for photonic computers.

The construction of a logic gate in which the logic state can be changed by a pulse of light instead of applying a voltage can mean the beginning of the end of current electronics and high chance of the Nobel Prize for scientists who developed the new technology.

The essence of the development is a logic switch created through the use of cadmium sulphide nanostructures on silicon substrate.

To make the switch, the scientists used a pair of nanowires; two such switches formed a NAND gate. During the test, pulses of laser light changed the output state in accord with the logic of the gate.
The most difficult and spectacular achievement was the 1,1 -> 0 state, when two "1" input signals resulted in "0" output - one light pulse blanked the other!

The basic switch is made of two nanowires, two such switches form a NAND gate

Possible combinations of logic states

NAND gates enable realization of all logic functions. The development of "optical" NAND gate may open the way for the construction of advanced integrated circuits, operating with optical signals, instead of electric charges.

The new technology may revolutionize ICT industry. Optical integrated circuits used in photonic computers should use less energy, be almost completely resistant to electromagnetic interference, and - perhaps most important - be much faster.
The introduction of photonic computers will also accelerate the development of optical fiber technology, currently hampered by comparatively expensive and inefficient media converters (from electrical to optical and optical to electrical form).

One of the scientists, professor Ritesh Agarwal, University of Pennsylvania, said that the research brings us closer to "a future where consumer electronics become consumer photonics."

On-chip laser light source made of CdS nanowire

"Engagingly about Antennas" - 11th edition.

The latest edition closed on September 30.
Summary of the competition and announcement of the winners list - in the Newsletter on October 15.
The entries

DIPOL is the leading supplier of SMATV solutions.

We are happy to announce that TERRA channel amplifiers and modulators won the Sat DIGI-TV 2012 statuette in the category "Best component of SMATV systems".

Optical path branching in xPON networks.

Passive optical networks are built based on point-to-multipoint architecture. The branching of the optical path is performed by a splitter, practically with a maximum split ratio of 1:128 of the signal from the Optical Line Terminal (OLT) located at the service provider's central office.

Optical fiber distribution frame ULTIMODE TB-48B L5448
is the perfect solution for organizing xPON infrastructure

Splitters are passive devices, which means that they do not need power supply. On one side (input), a splitter is connected to the fiber coming from the OLT, on the other side the outputs are usually connected to fibers of an easy access cable.

An example of connections inside the ULTIMODE TB-48B L5448 frame

A complete solution of connections for a split ratio of 1:16 is shown in the diagram above. The signal carried by the fiber entering the TB-48B L5448 frame is split into 16 paths by the ULTIMODE SP-16B L3616 splitter. The outputs of the splitter are connected with the fibers of the ULTIMODE BS12-SM L7712 distribution cable (easy access technology). The connections are made with the use of L4211 adapters, L3551 pigtails, and L5550 mechanical splices. ULTIMODE TB-48B L5448 is equipped with two splice trays and place for two optical splitters plus spare fibers.

Reception of CATV/DVB-C on several TVs.

The home distribution of digital channels (DVB-C) provided by a CATV operator can be based on typical passive splitters, e.g. R60102 (two televisions) or R60103 (three televisions). The DVB-C channels are usually encoded, so each TV has to cooperate with appropriate set-top-box (decoder), sometimes with the subscriber card. It is usually connected with an extra "multiroom" fee. The problem can be omitted if the CATV service includes analog channels and the programming is satisfactory for the users of the additional TV(s).

The sharing of a cable TV line which provides both TV and Internet services requires to take into consideration the return channel. The equipment, in particular the amplifier, also has to transmit the signal from the subscriber to the service provider. An example is the TERRA AS038R65 R82040 amplifier, equipped with four outputs. One of the outputs can inject the return signal.

Sharing a cable TV line with the Internet service

Return channel connectivity is possible through the output No. 1. The output must be connected to the broadband cable modem (directly or via diplexer isolating data channels from the rest of the cable TV spectrum).

The subscribers who split the cable TV line on their own should rather use amplifiers with passive return channel (like the mentioned AS038R65 R82040). Otherwise, uncontrolled amplification of the signal in the direction to the network could be a source of major problems and even harm other users. The multimedia switch is normally supplied by the service provider.

Video surveillance of parking lots.

The key to effective monitoring of parking lots is the proper selection of cameras and lighting.

For effective monitoring of poorly lit parking lots one requires cameras with increased sensitivity, supported by IR illuminators. An example of high quality camera ideal for this purpose is n-cam 270 M11287. A big advantage of the camera is a mechanical IR cut filter (ICR), the application of which ensures accurate color reproduction in visible light. It eliminates possible problems with identification of colors of the cars on video recordings.
The parts of parking with sufficient lighting can be monitored by u-cam 650 M11194 cameras equipped with Tokina TVR2713DCIR M2315 lenses. This model of CCTV camera is characterized by high resolution and sensitivity, as well as excellent image processing performed by Effio processor. The use of HLC function (High Light Compensation) ensures that the images from the camera will not be overexposed by the headlights of passing cars.

Additionally, the whole parking lot can be monitored by high speed dome camera PH-33 M1196 featuring 33x super-zoom lens.

Basic guidelines for effective video surveillance system in a poorly lit parking lot

Image analysis functions in NUUO software.

Image analysis is an improvement of the video surveillance system that makes the job of the operator much easier. It practically eliminates the most boring part of operating typical system, i.e. continuous observation. Built-in intelligent functions practically eliminate the risk of an oversight of critical events, which is very important for the safety of the monitored place.
Thanks to the use of such functionality in large systems (with many cameras), the number of operators can be substantially reduced. Small systems can be fully automated (work without operator). There is also possibility of combined operation, e.g. with operator during days and automatic at nights.
The module of image analysis and system monitoring being a part of the NUUO package can react to the following events:

All the cases are processed by "Guard" application (reaction to events) and "Counting Application". The "Guard" application is used to define the system's response to various events.

IP camera settings window in NUUO software

Any event can trigger the following action:

Each action can be performed for a specified period of time.

Full power management.

The 8-port 19" rack-mount PoE adapter can transmit power to up to 8 devices via Ethernet cables. Its power supply connector (2.1/5.5) should be connected to a 12-28 VDC voltage source with the required current rating (max 11 A). The LCD display shows the actual values of the voltage, total current and power consumption. The information allows for full monitoring of the operating status of the connected power supply. The application of the 8-port PoE in a 19" RACK cabinet ensures better utilization of the space due to elimination of a number of power supplies and provides the possibility to use a single buffer/UPS power supply for multiple devices.

View of the N9207 8-port rack-mount PoE adapter with load monitoring

Dual-band wireless router TP-LINK N750 TL-WDR4300. Short presentation of the latest dual band wireless router N3260 from TP-LINK. It's so easy to create a perfect, highly efficient wireless home network in minutes!

No more problems with remote control of devices hidden in cabinets. The use of modern and esthetic cabinets for electronic devices may cause problems with remote control. In such situations, it is necessary to use special IR benders... more

Typical application of Signal IRB-600U IR remote control bender

IP CCTV cameras with Flash technology. Customers and installers are increasingly interested in viewing images from security cameras with the use of popular browsers other than IE. Sunell is the first company that provides software for its K1620, K1630, K1650, K1660, K1670, K1680, K1690, K1691, K1695 cameras to display the video in Flash Player... more

The Internet for the blind. The invention which will really open the Internet for the blind is "feelscreen" - a screen that allows the user to experience various sensations associated with touch. Roundness, concavity, roughness, smootness etc. - these are the features that can be coded and transmitted over the Internet, and the recipient with the special screen will be able to identify by touch.
The Time Magazine's list of "The 50 Best Inventions of 2011" includes the screen being developed by Finnish company Senseg, the prototype of which was unveiled at CES 2012 in Las Vegas. In contact with the skin of the user... more