- WiMAX is the most advanced technology as regards the number of implementations. The concept of building all-American 4G network based on WiMAX is strongly supported by Sprint company. Until recently, a problem was the lack of dedicated mobile devices. But in September Motorola presented in Chicago working prototype of mobile terminal for metropolitan areas. It seems that development of nationwide WiMAX network has been given a new impulse.
- UMB (Ultra Mobile Broadband) is an extended version of cellular CDMA2000 standard. Its advantage over WiMAX is to be higher throughput - up to 275 Mbps.
- LTE (Long Term Evolution) - it is evolution of 3G (UMTS) system, with transmission speed up to 100 Mbps. Currently expanded UMTS systems employing HSDPA technology (called GSM 3.5 G) offer theoretical throughput up to 14.4 Mbps (practically ca 7 Mbps).
Notice! The combined signals cannot operate with DiSEqC switches, so the LNBs are not suitable for "doubling" on one satellite dish. In other words, the converters are fit for reception from one satellite location. For receiving two satellites one should use Quad Monoblock converter A98261 and satellite/terrestrial combiner R85248 (it does not pass DC power to preamplifiers).
The cabling installation should be made with high quality cable guarantying stability of parameters and many years of use, e.g. TRISET-113 E1015_100.
Splitters should only be used for dividing the signal into a desired number of sections. The main reason is low separation among outputs of a splitter. Together with specific feature of TV tuners - they ensure proper matching only for tuned-in channels - the low separation favors the spread of other signals' reflections within the whole network. So the splitters may be employed only for small-size antenna networks, having several outlets. Bigger installations, with over 20 outlets, require to use taps, and splitters should be only applied to distribute the signal to taps. The unused outputs of the splitters have to be closed with 75 ohm terminating resistors.
The signal reflexions cannot be eliminated completely, but can be reduced to the levels that do not harm overall system quality. When using taps instead of splitters (tap attenuation 12 dB to 20 dB), the reflected signal comes back to the network (adequately) 24 to 40 dB lower than the useful signal, so it will not be practically noticed as a ghost image.
Implementation of taps, especially in larger network, requires high signal. The best solution is use of channel amplifiers, e.g. ZG-401/601.
Passive elements for antenna installations - Signal
There should be strict limitations inside a church or temple - the cameras can only be installed e.g. high above the altar, and never in the area for the congregation, especially in the case of PTZ devices.
Some cameras may only be perceptible when they monitor a precious object, e.g. a panting, but they are only allowed to watch its closest surroundings, not the people standing around.
Analyzing the purpose of CCTV installation one should realize that modern CCTV systems can substitute alarm installations, expanding a lot their typical functions. The sensors of an alarm system can trigger a danger signal, but they are not capable of recording the event, the face of the perpetrator etc. CCTV system with motion detection function or with additional sensors can easily do the job.
In busy places, there are indispensable color cameras - they enable the staff to identify the people. But the contractor should ensure proper operation of the cameras also in low lighting conditions and at night. For this purpose the best choice is day/night version. The day/night camera SN-468C M11202 ensures high resolution (480 TVL) and NightVision function.
The cameras inside a church shouldn't be visible, e.g. they can be located high above the altar
It is unacceptable to install cameras, especially PTZ ones, in the congregation area
Example: 8 cameras, D1, 8 fps, 7 days - it is needed at least 302.4 GB of disc space.
The manufacturers of IP CCTV devices employ various compression methods (which also have different bandwidth requirements), so the specific needs may differ from this example.
needed disc space (for 1 camera)
MPEG-4 also uses GMC (Global Motion Compensation) technique. Due to GMC, the effects like zoom or camera rotation can be described by a limited number of parameters and the previously saved information.
- Special construction of the camera housing:
- smoked dome made of polycarbonate - it is difficult to notice the direction of operation,
- dome shape improves resistance to impacts,
- special construction allows to hide the cable in the ceiling - it additionally protects the camera post,
- possibility of wall mount - extra options enable the installer to use dedicated brackets, also the version with hidden cable,
- possibility of changing the lens, which allows to adjust viewing angle to the specific job, e.g. monitoring of big entrance hall, or narrow hallway.
- IEEE 802.11a/b/g ,
- 2 x uF connector for external antenna ,
- mini PCI interface,
- Super G technology (up to108 Mbps),
- eXtended Range (up to 9 times broader range in comparison with regular devices),
- Seamless Roaming (switching among APs).
During the exhibition there will be possibility of direct contact with our marketing and technical specialists - we invite everyone interested in cooperation in the fields of SAT TV, CCTV, WLAN. Our existing and prospective partners can negotiate prices and take part in the courses. The guideline of Dipol's exposition at SatKrak is "Multimedia Home". We will present in detail the idea for designing and implementing structural cabling that combines all services needed by the residents of modern homes.
We will present a new Dipol website on the show. After 11 years we have changed design of our site, adding a lot of functionality.