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DIPOL Weekly Review - TV and SAT TV, CCTV,WLAN
No. 27/2008 (Sept. 1, 2008)
Digital terrestrial television in the world. The main DTT standards are DVB-T, ATSC, ISDB-T, and DVB-T/H.
The most popular standard (in terms of the number of the countries and their area) is the European DVB-T. In most cases it is used for distribution of programs in standard resolution (SDTV). A second generation DTT standard, DVB-T2, is planned for broadcasting HD channels. It is to be finally adopted next year, but many European countries have accepted this platform yet (e.g. Great Britain plans to transmit London 2012 Olympics using this standard).
Amerykański standard ATSC musi zostać unowocześniony, jego podstawowy problem to niemożność wykorzystania tego standardu w transmisjach mobilnych.
Standard ISDB-T wykorzystywany jest w Japonii i Brazylii.
Chiński, dualny standard cyfrowej telewizji naziemnej DMB-TH (Digital Multimedia Broadcasting - Terrestrial / Handheld) jest uznawany obecnie za najnowocześniejszy. Bazuje on na technice modulacji TDS-OFDM (Time Domain Synchronous - Orthogonal Frequency Division Multiplexing), która jest bardziej zaawansowana niż OFDM, stosowana w standardzie DVB -T, nie mówiąc już o stosowanej w ATSC - 8VSB.
DMB-TH wykorzystywany jest do transmisji HD i mobilnej w Chinach, a testy wdrożeniowe prowadzone są w Ameryce Południowej (Wenezuela) i w krajach arabskich (Syria, Jordania).
DTT standards in the world (the source: Wikipedia)
Telecommunications in Portugal. Portugal has 10.6 million citizens. There are 4.2 million subscribers of fixed telephone lines, and 12.2 million active cellular phones.
The number of Internet users is estimated to be 3.2 million (2006). The number of hosts (computers with permanent IP address) is about 836 000 (2007).
According to European Competitive Telecommunications Association, at the beginning of 2006 about 12.3% of Portuguese people had broadband access to the Internet.
At the same time the European leader was Denmark, with the percentage of 29%, whereas the figure was 4.4% in Czech Republic, 3,3% in Poland, 75% in the USA.
The leader of TV market in Portugal, both in the number of subscribers and in implementation of modern technological solutions, is TV Cabo. In 1999, TV Cabo supported by Motorola introduced broadband Internet in cable networks. It was also the first television platform in the world that started up interactive TV services (VoD, home banking, shopping - based on Microsoft TV Platform).
Portugal belongs to the small group of several European countries that have not launched digital terrestrial broadcasts yet. The start of DVB-T platform is planned for 2013, including terrestrial HD transmissions.

Telecommunications in Portugal
Telecommunications in Portugal
Telecommunications in Portugal
Portugal - excellent soccer players, coffee and cherry liqueur but...
...telecommunications only at average European level
Focus hotel chain modernizes TV antenna systems. Ważne wydarzenia sportowe mobilizują do poprawy jakości odbioru programów telewizyjnych. Ze względu na komfort klientów, sieć hoteli Focus zdecydowała się przed Olimpiadą w Pekinie na poprawę jakości i ilości odbieranych programów.
Jednym z wymienianych elementów była stacja czołowa w hotelu w Szczecinie.
Firma INNEX, do której zwrócił sie inwestor zaproponowała wymianę stacji czołowej na MMH-3000 TERRA.
Digital modular headend TERRA MMH-3000 is a compact headend solution for the reception of DVB-S and DVB-T programs for analog redistribution in SMATV and small CATV networks, e.g. in hotels, boarding houses, multi-family houses, housing developments. Thanks to vestigial side band modulators it allows to utilize adjacent channels. MMH-3000 can be installed into a standard 19" rack. The UC-380 base unit incorporates power supply, RF amplifier, and intelligent data bus. It may hold up to 8 individual modules - digital satellite or terrestrial receivers and RF modulators.
Main features of the MMH-3000 headend:
  • possibility of receiving a number of encrypted programs with a single card
  • PC-controlled and programmed
  • manageable via the Internet
  • Master - Slave technology
  • access to the system log (events)
  • possibility of SMS alarms (via PC GSM terminal)
  • graphical representation of adjusted parameters
  • VSB modulators
  • 2-year warranty
Due to capability of demodulation of multiple transponder streams, the complete stream is available as MPEG-2 TS (Transport Stream) at the dedicated output of QPSK CI Receiver RD-313C. It can be utilized by MPEG-2 TS Decoders/VSB Modulators DM-313 (R81712). It is an optimum solution for receiving several programs from one transponder, saving the number of QPSK receivers with CI modules.
Do wzmocnienia sygnałów ze stacji czołowej użyto wzmacniaczy kanałowych firmy Alcad - ZG.
Po zakończeniu prac w hotelu w 128 gniazdach dostępne są 32 kanały telewizji (w tym 24 satelitarne).
Najnowsza technologia firmy TERRA w połączeniu z fachowością wykonawcy sprawiła, że instalacja spełniła wymagania inwestora.
The Terra headend and set of channel amplifiers installed in Hotel Focus
ULTIMAX - DVRs for demanding customers - control with a mouse. ULTIMAX DVRs can be fully managed via computer network. With client program or even Internet browser, the remote users can have access to functions according to their access level (set by the administrator of the system). The functions include live monitoring, playback, PTZ control - all of them can be controlled with a mouse. It makes much easier to chose the desired options and functions. Most other DVRs available on the market enable the user to control with a mouse only menu options. In ULTIMAX DVRs there is possibility of choosing and controlling the main functions:
  • number of displayed channels,
  • choice in the menu the parameter to be adjusted (for quicker access),
  • single-key selection of:
    • manual recording,
    • manual playback,
    • PTZ control.
ULTIMAX has won a prestigious award - Gold Medal of Intertelecom 2008
Remote access to NVR servers. Remote access to video, from any place in the world, becomes a standard feature of modern video surveillance systems. The indispensable condition of good results, aside from broadband Internet access, is adequate software. The software can perform functions like live monitoring, playback, system control and configuration.
The examples of such software are NUUO and **Netstation.***www.dipol.com.pl/eshop/items.php?search=Netstation*** applications. The both software packages enable the users to get remote access to the system and its resources.
They also allow to control PTZ cameras (in real time) and play back the archives recorded on the NVR server. Najważniejszą cechą wymienionego oprogramowania jest możliwość zdalnego administrowania całym systemem.
Warunkiem zdalnego dostępu do systemu jest stałe połączenie z Internetem. Jeżeli dla systemu nie można wydzielić adresu IP, należy skonfigurować przekierowania odpowiednich portów na routerze.
Dostęp zdalny do systemu może się odbywać za pomocą oprogramowania klienckiego lub przeglądarki internetowej. Możliwe jest nadawanie użytkownikom różnych uprawnień dostępu do systemu.
NUUO software package
Netstation software package
Comparison of megapixel cameras in difficult lighting conditions. Most megapixel cameras are based on CMOS sensors. These sensors usually have lower sensitivity than the CCD counterparts used in majority of professional standard-resolution cameras. But a skilled setting of image parameters allows to get good quality even in adverse lighting conditions. Below there is the comparison of screenshots from ACTi ACM-5611 K1511 and other camera of a leading manufacturer, not equipped with night mode. Warto na koniec nadmienić, że uzyskanie takiej jakości obrazu możliwe jest przy odpowiednim ustawieniu wzmocnienia (AGC) oraz czasu otwarcia migawki (shutter speed).
Image from megapixel camera ACTi ACM-5611 K1511
Image from other megapixel camera without day/night mode
New ADSL router TP-Link TD-W8901G. TP-Link TD-W8901G N2902 enables the user to share Internet connection supplied by a telephone operator in ADSL technology (Annex A). Its ADSL modem is compatible with ADSL/ADSL2/ADSL2+ protocols, and the Access Point can work in IEEE802.11b/g standards. The device has been also equipped with 4-port switch, and its WAN port (R11) is to be directly connected with phone line. An important feature of TP-Link TD-W8901G is possibility of using QoS control mechanisms.

TP-Link TD-W8901G offers a number of means for protection of WLAN:
  • SSID hiding, enabling connections only for the stations with preset SSID,
  • 64/128/152-bit WEP, WPA/WPA2, WPA-PSK/WPA2-PSK and TKIP/AES.
The TD-W8920G router is easily manageable with any web browser. The device needs only simple configuration and ensures very good stability.
Wireless ADSL2+ (Annex A) Router: TP-Link TD-W8901G (integrated with 4-port switch and AP)
ADSL2+ router TP-Link TD-W8901G
N2902 integrated with 4-port switch and Access Point
Quick Secure Setup (QSS). This function enables the user to configure the wireless network quickly and easily.
QSS can be exemplified by its application in TP-LINK TL-WR841N N3251. Pressing QSS button on the case of this AP and starting adequate driver of the wireless card also supporting QSS, the user begins automatic configuration of the link. The whole process takes about 10 seconds.
TP-Link devices with QSS function:
  • AP 802.11n (draft 2.0) TP-Link TL-WR841N with built-in router and 4-port switch - 300 Mbit/s N3251,
  • Wireless adapter 802.11n (draft 2.0) TP-Link PCI TL-WN851N, 300Mbit/s N3271,
  • Wireless adapter 802.11n (draft 2.0) TP-Link miniPCI TL-WN861N, 300Mbit/s N3261,
  • Wireless adapter 802.11n (draft 2.0) TP-Link PCMCIA TL-WN910N, 300Mbit/s N3231,
  • Wireless adapter 802.11n (draft 2.0) TP-Link USB TL-WN821N, 300Mbit/s N3221.
The LED indicator situated close to QSS symbol shows the status of configuration process
Green blinking means proper conditions for establishing wireless link with QSS function (it is in the process)
Continuous green light indicates that the configuration of wireless link with QSS has been successful
Red blinking means lack of wireless link - the QSS attempt ended in failure
Normally the QSS function makes the configuration of a new wireless device much quicker, saving the time of the home or SOHO user.
We have written about

9-cable system - multiswitch installations. The most flexible multiswitch installations in multi-story buildings are based on 9-cable system (signals from two Quatro LNBs and terrestrial TV antenna). On each floor we employ the splitter providing signals to multiswitches. It allows to shape the network according to actual requirements - we may deploy practically unlimited number of outlets...
- archive DWR of Jan. 14, 2008

Remote monitoring via Internet. Easy access to the Internet allows to distribute in the Web both live and archived video. Many users have access over ADSL links, without static IP addresses. In this case, to operate video servers it is indispensable to use DDNS service...
- archive DWR of Jan 14, 2008

How does DDNS work? Users of ADSL service (e.g. Neostrada in Poland) do not have a static IP - it is changed periodically. With this type of connectivity it is not possible to run a server, because the current IP address is unknown...
- archive DWR of Dec. 17, 2007

Index of published issues
Modular Headend TERRA MMH-3000
 
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