Tuesday, December 13, 2011

Distributing Video Over CAT 5 and CAT 7

Some SI Need to Know About Video Distribution Through Cat5 or Cat7


When thinking of setting up your home video system, it means that you should know something about distributing video over CAT5 and CAT7 because it is the kind of system that will broadcast optimum performance. It also means that you can now have your source from a distance away from the display device, television or monitor.
There are three (3) general types of video distribution system:
1) Analog or Baseband
2) Internet Protocol
3) Radio Frequency

Any of these types may use coaxial cables, category 5 or more commonly known as CAT5 cables, CAT5e, CAT6, CAT6e or CAT7 cables. What are the differences between them?
1) CAT-5 distributes video up to 100M.
2) CAT-5e 350M.
3) CAT-6 and CAT6e distributes video as far as 550M to 1000M
4) CAT-7 is rated from 700M to 1000M.

Viewing Video Over CAT5 or CAT7
Video over CAT5 or CAT7 like those delivered by CATV, data, and telephone are all distributed in similar wiring closets. It delivers videos that may run along a distance of 100M for CAT 5 or even up to 1000M for CAT7. Video over CAT5 or CAT7 all goes out on the same cabling system. The system is channeled in a passive broadband balun that converts any uneven coaxial signal into a balanced signal through the video over CAT5 or CAT7. Even when distributed to different channels simultaneously, it will not slow down the network because the air analog signals do not travel on that similar network, and thus, it does not rely on the bandwidth of the video signals.
Presently, the use of FTP or UTP cables for audio and video needs is prevalent. Instead of using coaxial cables, CAT5 and CAT7 cables are used. Coax are first installed into the hubs and everything else is distributed through the FTP/UTP. Video over CAT7 or CAT5 for that matter are now possible at a limited cost. There is ease in the installation and location change is not a big deal. All one needs to do is connect patch cords from the distribution hub to the patch panel and have a single port converter connected to the television.

Advantages of a Video System Using CAT5 and CAT7
1) Video over CAT5 or CAT7 is cost effective as it eliminates the need for additional coaxial cables.
2) Configuration of video over CAT5 or CAT7 is much easier than having multiple splitter taps, amplifiers and combiners of coax.
3) A high quality signal is maintained as the distribution system of video over CAT5 or video over CAT7 uses active RF video hubs. It makes automatic slope adjustments hence all video channels’ image quality is sustained.
4) The video distribution system of CAT5 or CAT7 can carry out voice and auxiliary signals simultaneously. There are no interferences between the voice and video data.
5) A system with video over CAT5 or CAT7 allows video streaming from the computer and it is made possible through a broadband video system.
Distributing video over CAT5 and CAT7 is made possible through an RF broadband system. It broadcasts CATV, HDTV, internally generated video, video-on-demand services, and satellite videos through twisted pairs of CAT5 or CAT7 cables.

12 comments:

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Anonymous said...

difference between CAT-5, CAT-5e, CAT-6, CAT-7
CAT-5 is rated to 100M
CAT-5e is rated to 350M
CAT-6 and CAT6e is rated to 550M or 1000M depending on your source
CAT-7 is supposedly rated to 700M or presumably 1000M

Today there is no approved CAT-6 or CAT-7. While some folks are selling products they call Level 6 or 7, there aren't even specs for them, making CAT-5e the best available option. CAT-6 cable is being made with 23 guage conductor wire as opposed to the slightly smaller 24 guage for CAT-5e and also has a separator to handle crosstalk better.

Both CAT-5 and CAT-5e have 100 ohm impedance and electrical characteristics supporting transmissions up to 100 MHz. The differences between CAT-5 and CAT-5e show in all aspects of performance: capacitance, frequency, resistance, attenuation, and NEXT. CAT-5e components were designed with high-speed gigabit Ethernet in mind. While CAT-5 components may function to some degree in a gigabit Ethernet, they perform below standard during high-data transfer scenarios. CAT-5e cables work with ATM and gigabit speed products. Simply, if you are using a 100Mbps switch, get CAT-5e cable instead of CAT-5.

CAT-5e is formally called ANSI/TIA/EIA 568A-5 or simply Cat-5e (the e stands for 'enhanced'). CAT-5e is completely backward compatible with current CAT-5 equipment. The enhanced electrical performance of CAT-5e ensures that the cable will support applications that require additional bandwidth, such as gigabit Ethernet or analog video.

Anonymous said...

Termination techniques::: Transmitting video over CAT5 cable

To avoid reflections and maintain integrity of the input video signals, the line driver output must be properly terminated. The characteristic impedance of a standard Cat 5 cable is 100 ohm which is split into two 50 ohm resistors for driving the line differentially. Figure 8 and 9 show the termination scheme on the driver and receiver sides . C1 and RT of the receiver form a low pass filter to reject high frequency common noise picked-up by the cable. C2 is used to isolate the DC voltage difference caused by grounding inequalities between the driver & receiver systems. RB sets up the bias voltage for the receiving amplifiers. The BW of the high pass filter formed by RB and C2 must be low enough to pass all the video signals. For SXGA video signals the low pass band must be less than 20Hz. A small resistor Rs is placed to isolate the input capacitance of the receiver from the PCB trace inductance to avoid LC resonance effect at the receiving amplifier inputs.

Anonymous said...

IP-based camera systems are here to stay, maintains Greeff. “On paper, the technology has a
number of inherent advantages over some competing technologies. For instance, there are no cable distance issues (90-100 m rule) and real-time transmission over UTP with power and data supply can be achieved at distances of up to 800 m, depending upon camera loading.”
What the public needs to realise is that analogue and IP over UTP is also an option, though one often overlooked.
Another key benefi t of UTP is that it costs less per metre than any other type of LAN (local area network) cable. In real terms, this translates to companies spending less on cabling and more on actual end-user security devices.
UTP also opens up possibilities in terms of extension.
“Spare pairs are easy to accommodate at little, if any, additional cost because, much like telephone extensions, the spare pairs are already there. All active units also contain built-in ground lifting features, which in other systems, have to be bought separately.”
By combining the benefi ts of UTP and high-performance video transmission equipment, Greeff maintains that end users can enjoy superior technology.
“UTP is convenient, simple to use, and offers highquality UTP video transmission, all of which combine to bring the user a viable, competitive and future-proof security solution.”

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