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No. 34/2013 (Oct. 21, 2013)
Internet above the clouds.
Another European airline expands its offer with wireless access to the Internet via on-board WiFi. German airline Lufthansa will offer its passengers traveling medium distances a wide selection of movies, TV series, music, games and all the latest news via a dedicated website. The passengers should only connect to the on-board WiFi network using their own mobile devices - laptops, tablets or smartphones.Although the access to the Internet on aircraft is already very popular in the U.S. domestic flights, there has been a long delay in Europe. In general, there are several access technologies that differ in the bandwidth offered, but all with relatively high costs of implementation.
How it works?
American service provider GoGo, responsible for 81% of the in-flight Internet service market in the U.S., has built across the country an uninterrupted network of 3G base stations. These stations transmit data between aircraft flying over them and the Internet. With Air-To-Ground (ATG) 3 MHz broadband frequency license, they enable data transfer between aircraft and the ground station up to 3.1 Mbps, which has to be distributed among all passengers. It is a major drawback of this solution. A next-generation version of this system can increase the speed up to 9.8 Mbps, but it requires the installation of additional, expensive equipment. Another downside of systems based on direct communication with the ground is the range limited to continental flights - there is no coverage over seas and oceans.
The transmitters of the dedicated GoGo network provide Internet access for more than
1900 liners and 6000 private aircraft flying over the area of the United States
(source: www.techradar.com)
1900 liners and 6000 private aircraft flying over the area of the United States
(source: www.techradar.com)
Another, much more efficient method is to establish transmission between aircraft and satellite. In this case, the total downlink speed (from the satellite to the plane) can reach 50 Mbps, which, combined with the fact that satellites remove restrictions on communication over seas and oceans, makes this solution much more versatile. At the moment, the systems are usually using the Ku-band (12-18 GHz). There are plans for the use of higher frequencies, including Ka-band (26-40 GHz), enabling higher transmission speeds.
Satellite technology is the future for WiFi on planes.
It works over lands, seas and oceans.
(source: www.techradar.com)
It works over lands, seas and oceans.
(source: www.techradar.com)
The Internet access on board an aircraft is not free, but the costs are not sky-high. In general, the passenger must take into account the cost of approximately EUR 10 per hour of use, or EUR 25 per day, which will provide access throughout a long flight. Apart from Lufthansa, on-board Internet access is available in some liners of a few European airlines. It seems that the demand for such services is so strong that they will become a standard on nearly all planes, except perhaps those of the cheapest lines.
Not enough fibers? WDM!
In recent years, it has been increasingly popular to lay fiber optic cables in newly constructed or renovated buildings and other facilities. Sometimes, the cabling has been deployed without a clear vision of future applications, and due to costs, limited to a minimum in terms of fiber count. Such an approach, although economically justified at that time, can cause problems in carrying out suitable installations today. Contractors are often faced with the problem of insufficient number of the fibers for the full implementation of the transmission systems encompassing e.g. triple-play services, IP CCTV etc. The problems can be usually overcome with the help of WDM technology.
The principle of operation of the WDM system: devices A and B communicate with each other
in both directions over one single mode fiber using two different wavelengths, 1310 nm and 1550 nm
in both directions over one single mode fiber using two different wavelengths, 1310 nm and 1550 nm
WDM links have to use dedicated sets of devices, or complementary pairs in which one device transmits data at 1310 nm and receives at 1550 nm, and the second receives data on 1310 nm and transmits at 1550 nm.
 |  |  | ||
Conventional media converters and SFP modules have to use separate fibers for each direction of data transmission. The application of WDM devices allows for using only one fiber!
MMH-3000 universal headend - example of application.
TERRA MMH-3000 headend is the optimal solution dedicated for facilities and institutions requiring central management of the content distributed in the system. No need for additional devices (satellite receivers or other STBs) makes it particularly attractive for hotels, motels, hospitals etc. The modular design of the TERRA MMH-3000 headend allows for a wide range of input and output signals. The output signals may include analog PAL channels suitable for older televisions, DVB-T multiplexes, or the both types of signals simultaneously.
Terra headend configured for two satellite positions.
It distributes all channels in DVB-T standard,
including satellite FTA and pay TV channels in SD/HD quality.
It distributes all channels in DVB-T standard,
including satellite FTA and pay TV channels in SD/HD quality.
The implementation of the headend for a hotel, shown in the diagram above, is a good example to illustrate the principles how to select appropriate elements for this kind of applications.
- TDX-311 R81711 - DVB-S/S2 (8PSK/QPSK) FTA receiver / DVB-T COFDM modulator receives and converts free to air satellite channels selected from a whole transponder into a DVB-T multiplex. The maximum bitrate at the output is 31.66 Mbps, which tranlates into 7-8 SD channels or 2 HD channels in the multiplex.
- TDX-311 R81711C - DVB-S/S2 (8PSK/QPSK) receiver / DVB-T COFDM modulator receives encrypted (after installing suitable CI module) or FTA channels selected from a whole transponder and converts them into a DVB-T multiplex.
Terrestrial DVB-T multiplexes are distributed by the Terra at440 R82511 module, a four-channel highly selective tunable RF amplifier capable of filtering, amplifying and equalizing four digital multiplexes. The paths are equipped with automatic gain control (AGC) and ultra selective SAW (Surface Acoustic Wave) filters. The minimum signal parameters at the input required for proper equalization are 50 dBμV (level) and 32 dB (MER).
What kind of cameras should be used to monitor underground parking lots?
Underground parking garages with dimly lit spaces are especially susceptible to acts of vandalism and theft. Video surveillance systems can prevent such events and increase the sense of security. An important requirement should be the ability to recognize faces and car license numbers.Low ceilings and very uneven lighting with bright and dark areas pose a serious problem with the choice of the cameras. Due to the low height of installation, the cameras should be secured from tampering and attempts to destroy - the examples of such devices are vandal-proof ceiling cameras M10775 and M10780. They are characterized by high resolution and image quality necessary for capturing a lot of detail. Their varifocal lenses allow the installer to adjust the field of view from a wide scene to a narrow area, depending on the needs.
The video from the camera at the entrance to a parking lot is being increasingly used to identify the registration numbers of the cars entering/leaving the site. For this purpose it is necessary to use a camera with Back Light Compensation (BLC), and Wide Dynamic Range (WDR). The Sunell SN-FXP59/50UDR M10780 camera has the both functions.
Modern IP CCTV systems getting cheaper!
Investors having to choose the kind of a video surveillance system often reject IP CCTV solutions at the beginning of the consideration. The reason is that they are convinced of high costs of such systems. However, the prices of IP CCTV devices are becoming more and more competitive compared to analog equipment. In addition to attractively priced IP cameras, we offer now affordable IP NVRs. Of course, it is not the price level of analog solutions yet, but the difference is much smaller and many users should seriously consider to deploy modern IP-based systems.The key features of IP video surveillance systems include:
- possibility of much higher resolutions - a qualitative breakthrough
- possibility of managing the system from any place in the world
- opportunity of integration with LAN networks - reduction of additional cables
- possibility of local recording on SD cards
- decentralized data backup
Hikvision IP NVRs of DS-76xxNI-SE series are modern IP network video recorders capable of monitoring, recording and playing back images from up to 8 Full HD Sunell IP cameras at frame rates up to 25 fps from each camera. The standalone K2204 oraz K2208 IP NVRs with VGA and HDMI outputs and USB ports can be directly connected to monitors, without a need for additional computers.
IP NVR Hikvision DS-7608NI-SE K2208
Hikvision DS-76xxNI-SE IP NVRs can be operated in the IP network via Internet Explorer, Firefox, Opera, Google Chrome, or Safari browsers. They can also be controlled via free iVMS-4200 software that can be installed on computers running Windows, Mac, or Linux operating systems. The software allows for configuration and management of NVRs/DVRs and IP cameras. Mobile access to the system resources is possible via Android, Widows Mobile, and iOS devices running IVMS-4500 application.
How to choose an access point?
Access point (AP) is a device that connects wireless network to a wired system. So it has to have at least two interfaces: wireless - WLAN - using 802.11 standard, and wired - LAN - using 802.3 standard. AP is also the name of the basic operation mode of that device which allows wireless communication between any client equipped with a wireless card/adapter and the access point. The users (clients) connect to the wireless network in Infrastructure mode.Every access point can operate in various modes which perform specific functions. Some modes can combine several functions, increasing the functionality of the device. It is important for the user to select the appropriate model. The table below lists the most popular types of TP-LINK APs available in our offer.
The access points operate in the most popular 2.4 GHz band. The N2944 and N2942 models have been designed for indoor use (however the transmission range is given for free space - the attenuation of building structures cannot be determined in advance). The N2350 AP with increased output power should be connected to an outdoor antenna and can ensure range up to 15 km.
 |  |  | |
| Name | TL-WA901ND | TL-WA701ND | TL-WA5210G |
| Code | N2944 | N2942 | N2350 |
| Transmission range |  |  |  *with additional outdoor antenna |
| Wi-Fi standard | 802.11 n/g/b | 802.11 n/g/b | 802.11 g/b |
| Max wireless speed | 300 Mb/s | 150Mb/s | 54 Mb/s |
| Antenna | 3x 4 dBi | 1x 4 dBi | Dual 12 dBi |
| MIMO | 3T3R | - | - |
| Output power | <100 mW | <100 mW | <500 mW |
| WDS | YES | YES | YES |
| PoE | YES | YES | YES |
| QSS | YES | YES | - |
| AP mode | YES | YES | YES |
| AP Client mode | YES | YES | YES |
| Bridge mode | YES | YES | YES |
| Repeater mode | YES | YES | YES |
| WMM (Wi-Fi Multimedia) | YES | YES | - |
| AP Client Router (WISP) | - | - | YES |
| Security | WEP, WPA, WPA2, WPA-PSK, WPA2-PSK | WEP, WPA, WPA2, WPA-PSK, WPA2-PSK | WEP, WPA, WPA2, WPA-PSK, WPA2-PSK |
New products offered by DIPOL:
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DIPOL company news:
Fall training session in DIPOL
A training course in our headquarters in Krakow
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A video recording from 2 MP camera Sunell SN-IPC54/12DN K1630.
Please choose the best available resolution.
The recording quality is somewhat reduced by the compression used by YouTube.
Please choose the best available resolution.
The recording quality is somewhat reduced by the compression used by YouTube.
