The first version of H.264/AVC standard was established in May 2003. It was significantly expanded in March 2005 (by adding High x profiles) and in November 2007 (Annex G - Scalable Video Coding - an addition that allows to choose the quality level corresponding to the application or capabilities of the playback device) - the 8th version of this standard. There are some finishing touches still to be done, over a collection of minor amendments and improvements. The standard also awaits introduction of Multi-view coding (allowing choice of observation point - for Free viewpoint TV (FTV) and 3D TV applications). H.264/AVC coding is used, among other things, in Blu-ray technology, and has been included in the digital television project (DVB), both for satellite and terrestrial broadcasting. It allows effective HDTV encoding.
H264/AVC is also used to broadcast over the Internet (IPTV), among others, it is employed by the German Deutsche Telecom. This compression becomes the mainstream of modern monitoring systems based on IP CCTV technology, and provides the most effective and cost-efficient means of data transmission and storage.
The higher numbers of MPEG standards (MPEG-7 and MPEG-21) do not directly relate to compression algorithms, but constitute a kind of "meta-standards". MPEG-7, using XML language, describes the content of the material/transmission. In MPEG-4 streams, through various types of indexing, it enables the user to get quick access to the interesting fragments. In most applications, the basis of indexation is the time code. MPEG-21, also based on XML, defines the rights/restrictions on the use of digital media, imposed by their authors, producers and distributors.
This kind of compression allows to reduce bandwidth and disc space consumption
up to 50% in comparison with MPEG-4 SP.
RTVPROJEKT decided to perform the task in two stages. The first stage, the cabling, was installed by the subcontractor - Swietlik company from Krakow. The installation has been based on the coaxial cable TRISET-113 E1015, especially suitable for multiswitch systems, due to high screening efficiency and perfect matching.
The multiswitches and amplifiers were installed in the second stage, just before putting the buildings to use. Every house has been equipped with identical installation. Two staircases in each house required to use two SS-510 R70516 taps for division into subnetworks. The signals are provided by two TERRA MSR-912 multiswitches.
Terrestrial signals are processed by a set of ZG channel amplifiers. A great advantage of ZG amplifiers is high selectivity, i.e. capability of filtering the desired signal from the spectrum on the input and possibility of individual level adjustment for each channel. 2-year manufacturer's warranty protects the installer and user against any surprise.
The output levels set at 106 dBuV allow to provide signals between 62 and 82 dBuV in the subscriber outlets.
The equipment is protected against thunderstorms with Signal TV-Sat Surge Protector. The installation company used professional F-connectors E80274, enabling them to make high quality connections, quickly and efficiently.
The installation is prepared for future distribution of video signals from CCTV cameras, which will be available on TV screens of the residents. The SMATV system maintains the high standard of the buildings and provides a variety of excellent signals, fulfilling all requirements of the investor.
The author got "Chameleon mug".
How to get "Chameleon mug"?
The images transmitted over the IP network can be received in any location and converted into analog form by decoders of video stream (transcoders) connected to the LAN or WAN network. They decode the MJPEG/MPEG-4 stream and convert it back to analog video. It allows to use the existing analog monitors.
The list of ACTi devices.
Free ULTISYSTEM client program (VDR-C) allows connection with up 16 servers that can control up to 512 cameras, and can display images from up to 64 of them at the same time (the cameras can be dynamically chosen from the whole set). Due to "address book" utility, the program can create any number of groups of such connections. This potential of ULTISYSTEM software allows to monitor a lot of locations from anywhere in the world.
Non-operational (hardware error)
No wireless connection with router
Active wireless connection with router
WAN, 1, 2, 3, 4
No wired connection to router/port x
Improper wired connection to router/port x,
Active wired connection to router/port x, transmission OK
|Mikrotik license level||Antenna gain||Antenna directivity||Intended use|
|3, 4||17, 19, 23||K, S, D||C, N , B|
|3 3rd level||17 17 dBi||K Directional||C Client|
|4 4th level||19 19 dBi||S Sector||N Nstream|
|23 23 dBi||D Omnidirectional|| B Base station|
|The difference consists in the number of supported protocols and modes of work. It is shown in the table above (License levels).||Higher gain enables transmission over longer distance ||The exact angles are available in specifications of every ULTIAIR device.|
C For P2P connections.
- ULTIAIR 419KC N2300 and ULTIAIR 423KC N2301 - they differ in antenna gain;
- ULTIAIR 319KC N2310 and ULTIAIR 323KC N2311 - they differ in antenna gain;
- ULTIAIR 319KC N2310 and ULTIAIR 419KC N2300 - the difference consists in license level;
- ULTIAIR 323KC N2311 and ULTIAIR 423KC N2301 - the difference consists in license level.
Do it Yourself
DiSEqC - switching of satellite signals. The need for switching satellite signal from demanded converter (LNB) to the receiver is the reason for development of dedicated solutions. At the beginning there were used manually operated switches, then...
- archive DWR of Aug. 20, 2007
Intelligent video surveillance systems. Intelligent video surveillance system based on image analysis and continuous monitoring of the system performance improve dramatically efficiency of the system management performed by the operator...
Color Day/Night cameras Sunell SN-486C/W M11206 - External mode. An interesting solution introduced in Sunell Day/Night cameras is the possibility of choosing four modes of operation. Aside from Day mode (always in color), Night mode (always in B/W), and Auto mode (the camera switches between the first two modes depending on adjustable lighting level), there is another one - External mode...
- archive DWR of Sept. 15, 2008
Index of published issues
Waiting for 4G. Easier construction of large installations - new radial multiswitches. ULTIMAX - recording of city...