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DIPOL Weekly Review - TV and SAT TV, CCTV, WLAN
No. 10/2008 (March 10, 2008)
New concept of CeBIT - a success? This year's CeBIT in Hanover - the world's largest trade fair for IT and telecommunications - took place between 4th and 9th of March.
There were about 5900 companies (by 5 percent less than last year). For the first time in the history of the fair, China had the largest representation, surpassing in numbers the previous leader, Taiwan.
Among the notable absentees were Sony, Sharp, Philips, Lenovo, Dell and Nokia.
After several years of decrease of the number of exhibitors, the organizers decided to increase the number of conferences - to attract professionals, and shorten the event by one day - to cut the costs of exhibitors. But probably the main focus was to define the objectives of the exhibition.
Unfortunately the organization efforts didn't seem to refresh the event. They couldn't eliminate the feeling of deficiency, a want for new technologies and for an impulse to stop the decrease of investments in European telecommunications.
During the trade fair we could see a steady factor in European industry - expansion of red tape. The organizers, using subsidizing, invite national exhibitors that, instead of products, are showing travel brochures, and grassroots movements - promoting projects like Green IT.
In this situation the most interesting trends seen at the fair were network and mobile solutions for television - as an extension of offers of telecommunication operators. The solutions are based on technologies that improve data transfers, especially those of mobile telephony. The example is LTE technology presented by Sony Ericsson and T-Mobile.

LTE (Long Term Evolution) is the newest transmission system for mobile applications, developed according to the 3rd Generation Partnership Project (3GPP). The specification accepted in January, 2008, adopts theoretical limit of 326 Mbps (practical speeds reach 100 Mbps).

Our report from this year's event in the next issue.
Green IT on CEBiT
New amplifier from the SilverLine family - AWS-1036. The AWS-1036 B11587 amplifier has been designed for applications in individual and community antenna installations. The device has been equipped with one input (which may require to employ an antenna diplexer to combine the received channels), and four outputs with independent level controls.
It is especially suitable for signal distribution in community (MATV) and CATV systems (due to whole TV band).
The independent level controls allow equalize signals in outlets (or branches) in the case of different distances (compensation of attenuation of the cables).
The set also includes regulated AC/DC adapter (output: 12V/250mA, 3.5mm jack), but it is possible to power the amplifier through its "D" output, via coaxial cable, using RF/DC separator - AZS-03 C0397 (and the included power supply). It allows to mount the amplifier in the attic and power it from a place with access to the power line. When using a splitter - it has to pass DC voltage, like E2094.
SilverLine is a new generation of antenna amplifiers from AMS company. Modern design and circuitry, solid, cast metal housing, which protects them against external interferences - make the series leading European products.
Wzmacniacze posiadają odlewaną obudowę ZnAl, co znacznie polepsza skuteczność ekranowania. Są to wzmacniacze dwustopniowe z regulacja wzmocnienia umieszczoną pomiędzy poszczególnymi stopniami. Sprawia to, że sygnał z anten jest wzmacniany bez dodatkowych tłumień elementu regulacyjnego. Takie rozwiązanie polepszyło także parametry szumowe wzmacniacza.
Indoor antenna amplifier: AWS-1036 SilverLine (1 input, 4 adjustable outputs)Subscriber Terminal Outlet (4 dB) BM-100 - ALCADWall Plate EM-200 (for BM outlets) ALCAD
Requirements for input signals in multiswitch systems. In the case of large multiswitch installation there have to be used many amplification stages, which increases the noise figure of such system. It directly translates into increase of BER. BER values above 10-4 (in the outlet) will prevent the user from receiving satellite broadcasts (the receiver will not be able to restore the original signal). To ensure reliable and high quality decoding, the BER values should be at least about 10-8 (in LNB outputs). Signals with low BER are ensured by use of appropriate dishes, e.g. 110 cm - A9658. It is very wise to use large dishes - the whole multiswich system needs only one set of dishes, being a small part of the total costs, but deciding on the quality of the input (and output) signals.
LNB skew adjustment. When installing a satellite system it is important to set appropriate skew (or polarization) angle of the LNB. The angle depends on the satellite and geographical location of the site.
LNB rotational position ("skew") has to be set to the correct angle so that horizontal and vertical signals are received with equal strength. It optimizes the cross-polarization isolation between signals of vertical and horizontal polarizations. Ma to kluczowe znaczenie dla otrzymania dobrej jakości sygnału cyfrowego. Tłumienie przesłuchu pomiędzy polaryzacjami powinno wynosić co najmniej 20 dB (tak, aby na przykład podczas odbioru sygnałów o polaryzacji poziomej H nie były odbierane sygnały o polaryzacji pionowej V).
Bardziej precyzyjnym sposobem ustawienia kąta skręcenia jest wybranie dwóch transponderów, jeden z polaryzacji V i drugi H. Następnie należy wykonać pomiary dla obu polaryzacji przy pomocy miernika R10811. Optymalne ustawienie skręcenia konwertera jest wtedy, gdy BER dla obydwu transponderów będzie taki sam. Nie posiadając miernika można amatorsko skorzystać z funkcji wskaźnika jakości sygnału w tunerze.
The procedure of LNB skew adjustment
ULTIMAX - CCTV recorder of the 3rd generation. Pojawienie się rejestratorów serii ULTIMAX kończy erę problemów z jakością zapisu w rejestratorach 16-kanałowych. Rejestracja obrazów z 16 kanałów w rozdzielczości D1 (704 x 576) z prędkością 25 klatek na sekundę dla każdego kanału pozwala zaspokoić najwyższe wymagania.
ULTIMAX-716 M77160 to rejestrator o najwyższych parametrach. Do zapisu i transmisji wykorzystuje najnowocześniejszy standard kompresji H.264, pozwalający na uzyskanie najlepszej jakości obrazu przy zajęciu jak najmniejszej przepustowości sieci i pojemności dyskowej. Możliwa jest rejestracja audio 16 kanałów oraz dwustronna transmisja 1 toru audio w sieci (przesyłanie komunikatów z Centrum Monitoringu do kamery).
ULTIMAX-716 M77160, dzięki możliwości zainstalowania wewnątrz rejestratora ośmiu dysków o pojemności 2000 GB każdy, może zapisać 16 TB danych.
Rejestrator jest dedykowany do monitoringu obiektów sportowych, imprez masowych, obiektów wojskowych.
Rejestratory ULTIMAX można ze sobą łączyć w sieciach IP i uzyskać dostęp ze zdalnego stanowiska do 16 urządzeń.
ULTIMAX-716 posiada również możliwość współpracy aktywnej bądź pasywnej z bankomatem. Można uzyskać nr karty płatniczej na żądanie (aktywnie) albo otrzymać go za pośrednictwem bankomatu poprzez sieć lub port szeregowy. Numer ten może być wmiksowany w obraz i przekazany w trybie bieżącego podglądu, nagrany i odtworzony.
Network DVR: ULTIMAX-716 (H.264, 16 channels)
Distributed surveillance in IP CCTV systems. IP CCTV technology, based on Internet protocols, allows to build distributed monitoring systems, both as regards the number and deployment of monitored locations and the surveillance posts (monitoring centers). Configuration of such systems depends on the scale and purpose.
An economic solution may be based on one monitoring center that controls a number of locations. The software allows to integrate images from chosen areas on one or several monitors.
Different functionality is required in city monitoring systems. There are usually several public services that are interested in having access to the surveillance system (the police, municipal services, road maintenance etc). Appropriate configuration of access rights (to the images from the cameras, to PTZ control) allows to eliminate conflicts that could occur.
An example of the managing software for CCTV systems is Alnet Netstation K3208, K3216, K3232. This software is compatible with majority of IP devices manufactured by leading producers of IP CCTV equipment.
MPEG-4 IP Dome Camera: ACTi ACM-3211MPEG-4 IP Camera: ACTI CAM-5321 (Day/Night)
Appropriate configuration of access rights (to the images from the cameras, to PTZ control) allows to eliminate conflicts that could occur.
MPEG-4 IP Camera: ACTi ACM-1311 (IR)MPEG-4 IP Dome Camera: ACTi ACM-3211MPEG-4 IP Camera: ACTI CAM-5321 (Day/Night)MPEG-4 IP Camera: ACTi ACM-1431
Integration of many monitoring locations into a surveillance system with one monitoring center allows to control a large area from one place
Why RTOS (Real Time Operating System)? Operating system is the core of every digital recording device. It determines the overall quality and stability of the device. In industrial applications of computers, operating system decides on the sequence and way of performing the tasks. For RTOS it is important to take into consideration the time factor - positive result of operations depends not only on the sequence, but also on the time of completion. The example is conversion and compression of analog video signals. Recording of the signals in digital form (with set parameters: resolution, frame rate, number of channels) is a priority and has to be performed in real time. Any delay will cause loss of video data (e.g. several video frames). Real-time algorithms enable the system to perform critical tasks in precisely defined periods of time. In practice - DVR will delay less important operations (e.g. playback of archives) to ensure proper recording of video even with the maximum quality requirements. DVRs that are not equipped with RTOS systems simply decrease recording parameters, e.g. frame rate, losing some information. An example of DVR based on RTOS is ULTIMAX-716 M77160.
For high throughput demands - TP-Link IEEE802.11n (draft 2.0). DIPOL included into the offer a new series of wireless access devices based on the newest IEEE802.11n standard (draft 2.0). An advantage of the WiFi series is increased speed of transmission, up to 300 Mbps, very useful in multimedia transmissions.
TP-Link has also introduced inventive QSS (Quick Secure Setup) technology that allows to protect the wireless network easily.
The series of IEEE802.11n devices is also supported by CCA (Clean Channel Assessment) procedures which enable the system to find the best channels for undisturbed transmission.
Buying wireless devices compliant to n standard it is worth to know that they are compatible with each other only since draft 2.0 specification.
The devices aso support IEEE 802.11g and IEEE 802.11b standards.
Access Point 802.11n (draft 2.0): TP-Link TL-WR941N <br />(300Mbps, built-in router and 4-port switch)
Wireless PCMCIA Adapter: TP-Link TL-WN910N (802.11n - draft 2.0 - 300Mbps)
The access point TP-Link TL-WR841N (N3251) - 802.11n (draft 2.0) - with integrated router and 4-port switch
The 802.11n (draft 2.0) PCMCIA card - TP-Link TL-WN910N (N3231)
GSM antennas with cables and SMA R/P connectors. There area available GSM antennas with SMA R/P plugs that directly fit into many types of GSM modems/cards.
GSM Antenna: ATK 10/850-960MHz (10-element, with 10m cable &SMA R/P)
GSM Antenna: ATK 20/850-960MHz<br />(20-element, 10m cable with SMA R/P)
GSM antenna ATK 10/850-960MHz (10-element, with 10m cable &SMA R/P plug) - A7019
Antena GSM 20-elementowa ATK 20/850-960 MHz
+ 10m przewodu z wtykiem SMA R/P
A7029
UMTS Antenna: ATK-16/2GHz (13dBi, outdoor, 10m cable and SMA RP)
GSM/DCS/UMTS/HSDPA Antenna: ATK-LOG (5m cable, SMA/RP plug)
Antena ATK-16/2 GHz UMTS 13 dB z
+ 10m przewodu z wtykiem SMA R/P
A7037
Antena ATK-LOG GSM/DCS/UMTS/HSDPA
+ 5m przewodu z wtykiem SMA R/P
A7042
UMTS Antenna: ATK-P1/2GHz (7dBi, 5m cable, SMA R/P socket)
UMTS Antenna: ATK-P1/2GHz (7dBi, outdoor, 5m cable, SMA plug)
Antena ATK-P1/2GHz 7dBi UMTS
+5m przewodu z wtykiem SMA R/P
A7045
Antena ATK-P1/2GHz 7dBi UMTS
+5m przewodu z wtykiem SMA
A7046
Pisaliśmy w Informatorze:

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Spis tematów zawartych w Informatorach.
IP CCTV - the Systems of Today and Tomorrow - DIPOL at Intertelecom trade fair in Lodz, Poland: April 8 - 10, 2008
DIPOL at Intertelecom 2008 - see our virtual stand
 
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