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No. 13/2015 (March 30, 2015)
Revolution in 3D printing.
During the TED2015 conference, Carbon3D company unveiled a new type of 3D printer. The novelty is in the way of printing, being not only very spectacular, but also much faster compared to the popular types of today's 3D printers. The printing process consists in growing 3D-printed objects out of a pool of liquid resin. The source of inspiration for engineers responsible for the design was the scene from the movie Terminator 2, in which the T-1000 (opponent of the main character) is formed from a pool of molten metal.Most popular 3D printers create objects in a multi-step process of heat and mechanical treatment, wherein the material layers are sequentially deposited on each other. For example, the very popular printing technology called FFF (Fused Filament Fabrication) consists in extruding melted material to form layers of hot, semi-liquid plastic on the bed by a programmed pattern. This kind of additive manufacturing process is time-consuming and the size of the printed objects is limited.
A new way of 3D printing - CLIP (Continuous Liquid Interface Production) is a photochemical process. The printing material is a special resin which is polymerized under UV light. An oxygen-permeable membrane lying below the resin creates a "dead zone” (persistent liquid interface) preventing the resin from attaching to the window (oxygen inhibits the polymerization). By controlling the projection of UV light and the oxygen supply, it is possible to get even the most complex shapes.
The printing of 3D objects with the 3D Carbon printer
takes a few minutes and the accuracy is measured in microns.
Here is some example - the model of Eiffel Tower
has been produced in less than seven minutes.
takes a few minutes and the accuracy is measured in microns.
Here is some example - the model of Eiffel Tower
has been produced in less than seven minutes.
Carbon 3D printer has a special oxygen-permeable window below the ultraviolet image projection plane. The UV light emitted from the projector passes through the window and cures the resin in the chamber above. The method manipulates the light and oxygen to fuse the object in liquid medium, creating printing process that uses tunable photochemistry instead of the layer-by-layer approach. The object is grown continuously from the pool of resin, which guarantees a very uniform structure. This makes it more durable than an object produced by a conventional 3D printer. However, the most revolutionary advantage of the CLIP technology is a radical reduction of the printing time, from hours to minutes.
New version of SatNet software for designing multiswitch systems.
The free SatNet 3.5 application allows for planning installations based on the equipment manufactured by TERRA company. The projects are prepared in a graphical form, provide signal levels in all outlets and verify if they are compliant with suitable standards, prompt to use equalization function of the amplifiers, if required. This allows the designer/installer, sitting in front of the monitor, to predict what devices will be needed for distributing the signals and what settings like gain and cable equalization level (slope) will provide the desired results. In all cases these settings fully correspond with the optimum values in real networks.
The latest version of the SatNet program automatically detects wrong connections
This application is used by installers and designers around the world. The new version enables the user to:
- place multiswitches, amplifiers and passive components from the new net5 series
- verify whether all connections are correct
- use improved AA (Automatic Adjustment of levels) and AOS (Adjustment with Optimizing Structure) functions that simplify the designing process
- use mechanisms that select passive components with suitable parameters and provide optimum settings of multiswitches and amplifiers (adjustable with their switches)
- create hybrid systems combining the older and newest TERRA equipment - in the case of extension of existing systems
- make use of a new and easy way of selecting the equipment, just by application of a consistent series of devices
- "break" the groups of cables ("bus") for a greater flexibility at the designing stage
Cheap and efficient access point!
The TP-LINK CPE510 N2352 outdoor 300 Mbps CPE device has been created in order to provide an efficient solution for outdoor wireless networks. It employs high-power transmitter with maximum output power of 27 dBm, sensitive receiver and integrated directional MIMO 2x2 antenna with 13 dBi gain. With a central management system, the CPE510 devices are ideal for point-to-point and point-to-multipoint Wi-Fi connections. The professional performance combined with ease of use make them a great choice both for business and home applications.
The TP-LINK CPE510 5GHz 802.11a/n MIMO 2x2 N2352 AP
Thanks to Qualcomm Atheros chipsets, high-gain antennas, high-quality materials, specially designed enclosure, and PoE technology, the CPE510 AP can reliably operate in most climate zones, from -30℃ to +70℃ . The advanced, high power transmitter (Tx output power up to 27 dBm / 500 mW) and highly sensitive receiver (Rx sensitivity up to -95 dBm) enable users to overcome the range barriers of traditional Wi-Fi networks.
CPE510 uses TP-LINK MAXtream TDMA technology assigning each client of the wireless network a time slot for data transmission. This solution allows for optimization of the network resources, especially in the process of connecting new users.
The comparison of the throughput of the network as a function of the number of wireless clients
(blue line - MAXtream TDMA, yellow line - 802.11 CSMA)
(blue line - MAXtream TDMA, yellow line - 802.11 CSMA)
Additionally, Pharos Control software allows the administrator to easily manage all the CPE510 devices in the network from a single PC. The functions of the software include searching of the devices, monitoring of their statuses, firmware upgrading, network maintenance.
The server rooms in the 3 buildings have been connected via 2 cables, 30 m and 700 m. Due to a short distance between the buildings #1 and #2, the 8-fiber cable L79008 is installed above the roofs of the two close buildings over a distance of about 10 m. The 24-fiber cable L79024 between the buildings #2 and #3 has been directly buried in the ground. Both cables are composed of OM2 multimode fibers compatible with the active devices installed in the buildings.
The outdoor cables have been inserted into the buildings over distances not longer than 15 m from the inlets. The distribution systems in the buildings are based on cables with LSZH sheath - in accordance with the requirements for installations inside buildings compulsory in most European countries. If the indoor section in a building should be longer, it would be necessary to use a universal cable over the whole link.
Alarm circuit in 2EOL/NC configuration.
The most common way of connecting sensors to the control panel is the 2EOL/NC configuration. It uses a four-wire cable and two end-of-line resistors of a specified value, used for line supervision. If the control panel does not allow to program the value of the resistors, the typical resistance is 1.1 kΩ. This wiring arrangement enables the system to detect and handle the state of the NC contact, as well as any faults of the line, i.e. open loops and shorts, using a minimum number of wires. |  |
The wiring arrangement in 2EOL/NC configuration |
Symbols:
- S1 ⇒ anti-tamper output (TMP, TMP)
- S2 ⇒ alarm output (NC, NC)
- R ⇒ the resultant resistance "seen" by the panel
- R1, R2 ⇒ EOL resistors
- standby ⇒ R=R1 (S1,S2 shorted)
- alarm ⇒ R=R1+R2 (S1 shorted, S2 open)
- tampering event ⇒ R = ∞ ( S1 open, S2 not relevant)
- line fault (short circuit) ⇒ R=0
In the period when the sensor/detector does not indicate an alarm state or tamper event, the S1 and S2 outputs are shorted. The resistance seen by the panel is R = R1. If there is an alarm state, the S2 output is open and the total resistance seen by the control panel is R = R1 + R2. In the case of a tampering (opening the casing of the detector), the S1 output opens and the panel detects an open circuit, independently from the state of the S2 output.
Security camera in a home intercom system.
Cameras built in intercoms are usually quite simple, without possibility of zooming or adjusting the field of view. Additionally, the locations of the cameras make them naturally vulnerable to vandals, or the view from the cameras can be easily blocked by the caller. A good alternative is an independent CCTV camera, e.g. Sunell IRC59/21AP M11286, which eliminates these problems and offers much better image quality.
A video door entry system with the preview of the image from CCTV camera
on the intercom screen and on a television
on the intercom screen and on a television
The video from the camera is transmitted via outdoor UTP cable E1410 with the use of Etrix M16654 video baluns. Then, the signal is splt into two paths by the video signal multiplexer RV-1/2P M1707. One of them is used by the intercom, and the other modulates RF signal in the R95176 modulator, which can be displayed on a TV as another TV channel. Such solution allows for viewing the camera image both on the intercom and on the TV.
 | IP NVR Sunell SN-NVR10/04E3/016NS K2516 is a modern IP network video recorder capable of monitoring, recording and playing back images from 16 IP cameras at frame rates up to 25 fps from each camera, with 72 Mbps limit on the total recording bandwidth. This standalone NVR with VGA and HDMI outputs can be directly connected to a monitor, without a need for an additional computer. Thanks to embedded Linux OS, the NVR ensures stable operation and resistance to computer viruses. | |
 | Vibration Detector with Magnetic Contact SATEL VD-1 BR G3459 is designed for use in burglary and panic alarm systems. The detector employs two independent sensors, piezoelectric vibration sensor and magnetic contact, which makes it ideal for protecting a window or door against any intrusion attempts. The detector also has anti-tamper protection and NC relay output that can cooperate with any alarm control panel. Despite advanced electronics, the device features low current consumption. | |
 | Heat-shrinkable tube (60mm, for one fiber) L5555 for 0.25 mm or 0.9 mm optical fibers, used for strengthening and protecting fusion splices. | |
Worth reading
Splitting DVB-C signal. Digital cable subscribers are often faced with the problem of bringing the signal to the second room. In the best case (when the signal is not encrypted), it is enough to use a splitter and an additional DVB-C set-top box (unless the second TV has DVB-C tuner). However, in most cases the signal is encrypted and it is necessary to pay for second subscription or at least for multi-room service... more
Three options of distributing a DVB-C channel to additional television(s)
TRISET-113 - class A coaxial cables for multi-dwelling units
