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2013 年 7 月 24 日 星期三  |
| Video Multiplexer For CCTV And Surveillance Applications |
分類: 未分類 |
Fiber-optic-based video and audio multiplexers are designed specifically for pro A/V and broadcast applications. Digital Video Multiplexer is usually applied in video area, especially for Security defensive system.

A video multiplexer, also called mux, includes digital video transmitter and receiver, is a device that put recordings of signals from multiple security cameras on one cassette. It handles several different video signals simultaneously. Video multiplexers can split a monitor into various display areas and vice versa, combine output signals from several cameras to a single monitor. It can be used as a stand-alone video processor to control various types of video views directly to a monitor and/or in conjunction with a VCR surveillance recorder. They can also provide simultaneous display and playback features. Some video multiplexers allow for remote access. They combine the best features of switchers and quads.
Typical Applications of Video Multiplexers:
1. Putting the camera signal on a video channel that is accessible to your television.
2. Configurable camera recording.
3. Closed circuit television (CCTV) and video surveillance applications because a video multiplexer can split a monitor into various display areas.
4. Automatic camera detection.
5. Various media and broadcasting applications.
How to Choose Video Multiplexer?
Video multiplexers come in a variety of configurations and features that conform to certain quality standards. The features may differ in quality of resolution, channels, refresh times, weight, power consumption, etc.
When choosing the video multiplexer, you should consider the number of camera inputs you need while taking into account future changes (in case of expansion). Features you need to look for include the following:
1. A time and date stamp that lets you know when any recorded activity took place.
2. An alarm output.
3. Motion detection.
4. Capability to be used with your computer software.
5. Use with either color or black-and-white cameras.
Multiplexers are described as simplex or duplex. This description indicates the number of multiplexing functions they can perform at any one time. Simplex multiplexers can perform only one multiplexing function at a time and will show a full-screen image, whereas duplex multiplexers show split options while continuing to record because it has two multiplexing processors in the same unit. Thus, a duplex multiplexer can display multiple cameras at the same time while multiplex-recording those cameras. Triplex multiplexers add a third multiplexing processor that has the ability to view live and recorded video on the same screen at the same time. Quadriplexers, or quads, use four camera connections per monitor. Quads can split the screen and display all the four cameras simultaneously. This means that the images are compressed and the image resolution may be low. In comparison, a multiplexer records each camera individually; thus, no loss from compression will occur. This is because when the output of a multiplexer is connected to a recording device, all cameras are individually recorded in sequence.
FiberStore supplies complete video surveillance systems, including Video Multiplexers, Video Data Multiplexer, Audio Video Multiplexers and video Audio Data Multiplexer. We supply video multiplexer in different channels, such as 1, 2, 4, 8, 16, 24, 32 channels. The Data Audio Video Multiplexer is ideal for a wide range of multiplexing and remultiplexing applications including Broadcast/Studio, CCTV audio and Professional AV applications.
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2013 年 7 月 23 日 星期二  |
| A comprehensive understanding of fiber optic connectors |
分類: 未分類 |
Fiber connector has traditionally been the biggest concern in using fiber optic systems. While connectors were once unwiedy and difficult to use, connector manufacturers have standardized and simplified connectors greatly. This increases the user use convenient increase in the use of optical fiber systems; It is also emphasising taken proper care of and deal with the optical connector. This article covers connector basics including the parts of a fiber optic connector, installing fiber optic connectors, and the cleaning and handling of installed connectors. For information on connector loss, see Connector Loss Test Measurement.

Optical fiber to fiber optic interconnection can be made by a joint, a permanent connection, or a connector, and is different from the plug in it can be to disconnect and reconnect. Fiber optic connector types are as various as the applications for which they were developed. Different connector types have different characteristics, different advantages and disadvantages, and different performance parameters. But all connectors have the same four basic components.
- The Ferrule: The fiber is installed in a long, thin cylinder, the ferrule, which act as a fiber alignment mechanism. The ferrule is bored through the center at a diameter that is slightly larger than the diameter of the fiber cladding. The end of the fiber is located at the end of the ferrule. Ferrules are typically made of metal or ceramic, but they may also be constructed of plastic.
- The Connector Body: Also known as the connector housing, the body holds the ferrule. It is usually constructed of metal or plastic and includes one or more assembled pieces which hold the fiber in place. The details of these connector body assemblies vary among connectors, but the welding and/or crimping is commonly used to attach strength members and cable jackets to the connector body. The ferrule extends past the connector body to slip into the couping device.
- The Cable: The cable is attached to the connector body. It acts as the point of entry for the fiber. Often, a strain relief boot is added over the junctioni between the cable and the connector body, providing extra stength to the junction.
- The Coupling Device: Most fiber optic connectors do not use the male-female configuration common to electronic connectors. Instead, a coupling device such as an alignment sleeve is used to mate the connectors. Similar devices may be installed in fiber optic transmitters and receivers to allow these devices to be mated via a connector. These devices are also known as feed-through bulkhead adapters.
Table 1 illustrates some types of optical connectors and lists some specifications. Each connector type has strong points.
Table 1- Types Of Optical Connectors
Installing Fiber Optic Connectors
The method for attaching fiber optic connectors to optical fibers varies among connector types. While not intended to be a definitive guide, the following steps are given as a reference for the basic of optical fiber interconnection.
- Cut the cable one inch longer than the required finished length.
- Carefully strip the outer jacket of the fiber with "no nick" fiber strippers. Cut the exposed strength members, and remove the fiber coating. The fiber coating can be removed in two ways: a. by soaking the fiber for two minutes in paint thinner and wiping the fiber clean with a soft, lint-free cloth; b. by carefully stripping the fiber with afiber stripper. Be sure to use strippers made specifically for use strippers made specifically for use with fiber rather than metal wire strippers as damage can occur, weakening the fiber.
- Thoroughly clean the bared fiber with isopropyl alcohol poured onto a soft, lint-free cloth such as kimwipes. NEVER clean the fiber with a dry tissue.
Note: Use only industrial grade 99% pure isopropyl alcohol. Commercially available medicinal and isopropyl alcohol is light mineral oil dilution water. Industrial grade isopropyl alcohol should be dedicated.
- The connector may be connected by applying epoxy or by crimping. If using expoxy, fill the connector with enough epoxy to allow a small bead of epoxy to form at the tip of the connector. Insert the clean, stripped fiber into the connector. Cure the epoxy according to the instructions provided by the epoxy manufacturer.
- Anchor the cable strength members to the connector body. This prevents direct stress on the fiber. Slide the back end of the connector into place (where applicable).
- Prepare fiber face to achieve a good optical finish by cleaving and polishing the fiber end. Before the connection is made, the end of each fiber must have a smooth finish that is free of defects such as hackles, lips, and fractures. These defects, as well as other impurities and dirt change geometry transmission patterns of light and scattered.
Cleaving
Cleaving involves cutting the fiber end flush with the end of the ferrule. Cleaving, also called the scrible-and-break method of fiber end face preparation, takes some skill to achieve optimum results. Properly handled, the cleave produces a perpendicular, mirror-like finish. Incorrect cracks will cause the lips and the comb as shown in Figure 2. While cleaving may be done by hand, a cleaver tool, available from such manufacturers as Fujikura and FiberStore, allows for a more consistent finish and reduces the overall skill required.
The steps listed below outline one procedure for producing good, consistent cleaves such as the one shown in Figure 3. 1. Place the blade of the cleaver tool at the tip of the ferrule. 2. Gently score the fiber across the cladding region in one direction. If the scoring is not done lightly, the fiber may break, making it necessary to reterminate the fiber. 3. Pull the excess, cleaved fiber up and away from the ferrule. 4. Carefully dress the nub of the fiber with a piece of 12-micron alumina-oxide paper. 5. Do the final polishing. (See Figure 3.)

Figure 3 - A Well-cleaved Multimode Fiber
Polishing
After clean cleave has been achieved, the fiber end face is attached to a polishing brush, and the fiber is ground and polished. The proper finish is achieved by rubbing the computerized fiber end against polishing paper in a figure-eight pattern approximately sixty times.

To increase the ease and repeatability of connector installation, some companies provide the connector kits. Some kits are specific to the type of connector to be installed while others supply the user with general tools and informationi for connecting different types of connectors. Some connectors require the use of an alignment sleeve, also called an interconnection sleeve. This sleeve serves to increase repeatability from connection to connection.
Care and Handling of Fiber Optic Connectors
A number of events can damage fiber optic connectors. Unprotected connector ends can experience damage by impact, airborne dust particles, or excess humidity or moisture. Increase the optical output power of modern lasers may damage a connector, an often overlooked factor in discussions about handling and caring for optical fibers and connectors. Most designers tend to think of the power levels in optical fibers as relatively insignificant. However, a few milliatts at 850nm will do permanent damage to a retina. Today, optical amplifiers can generate optical powers of 1 watt of more into a single-mode fiber. This becomes quite significant when one considers that the optical power is confined in the optical core only a few microns in diameter. Power densities in a single-mode fiber carrying an optical power of 1 Watt (+30 dBm) can reach 3 megawatts/cm2 or 30 gigawatts/m2! To put it in everyday terms, sunlight at the surface of the Earth has a power density of about 1,000 Watts/m2. Most organic materials will combust when exposed to radiant energies of 100 kilowatts/m2. Clearly, power densities of 30 gigawatts/m2 deserve attention.
Cleaning
Another important thing to remember in handling fiber optic connector is that the fiber end face and ferrule must be absolutely clean before it is inserted into a transmitter or receiver. Dust, lint, oil (from touching the fiber end face), or other foreign particles obscure the end face, compromising the integrity of the optical signal being sent over the fiber. From the optical signal's point-of-view, dirty connections are like dirty windows. Less light gets through a dirty window than a clean one. It is hard to conceive of the size of a fiber optic connector core. Single-mode fibers have cores that are only 8-9 µm in diameter. As a point of reference, a typical human hair is 50-75 µm in diameter, approximately 6-9 times larger! Fiber optic connectors need to be cleaned every time they are mated and unmated; it is essential that fiber optics users develop the necessary discipline to always clean the connectors before they are mated. It is also important to cover a fiber optic connector when it is not in use.
Handling
- Never touch the fiber end face of the connector.
- Connectors not in use should be covered over the ferrule by a plastic dust cap. it is important to note that inside of the ferrule dust caps contain a sticky residue that is a by product of making the dust cap. This residue will remain on the ferrule end after the cap is removed.
- The use of index-matching gel, a gelatinous substance that has a refractive index close to that of the optical fiber, is a point of contention between connector manufacturers. Glycerin, available in any drug store, is a low-cost, effective index-matching gel. Using glycerin will reduce connector loss and back reflection, often dramatically. However, the index-matching gel may collect dust or abrasives that can damage the fiber end faces. It may also leak out over time, causing backreflections to increase.
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2013 年 7 月 22 日 星期一  |
| Installing A Network Cable Faceplate |
分類: 未分類 |
A Network Faceplates is generally used in new installations where concealed cabling is possible. The faceplate is fixed on a wall and the keystone jack is fixed in the hole so that the Cat 6 wall jack of the keystone jack is exposed outside and the patch cord (from the computer) can be attached to it. At the other side (inside the wall) lies the inner part of the keystone jack that connects to the longer network cable.
First, you should ensure where to locate the network cable faceplates.
Industry cabling standards require that each location be provided with a minimum of one work area outlet location. A outlet location is usually a faceplate supporting two or more modular outlets/connectors.
Each outlet of connection must terminate one approved type of horizontal media. Therefore, each location must be supported by a minimum of two modular outlets/connectors and two approved horizontal cables.
Work area outlets can be placed in different locations for each area. The exact location is usually a function of the horizontal pathway connecting the area to the Telecom Room (TR). Work area outlet locations can be installed in any of the following areas.
1. On the wall
2. On the floor
3. On a power pole
4. On the modular furniture
Work area outlets are usually mounted on the wall when above ceiling or conduit distribution systems are used for horizontal cable distribution.
Work area is usually in the wall outlet when used in channels of distribution for ceiling or horizontal distribution cables.
They are usually installed on the ground below the floor line, land mobile, or the access floor system for horizontal distribution cables are used.
They are usually mounted on a utility pole, when used on ceilings or cable distribution channels for horizontal distribution cables.
They are usually mounted on a modular furniture system, if there are no walls or floors are available.
Second, know how to add cable faceplates.
If you run the cable through the wall, you can terminate the cable guide to the wall with the Ethernet connection is secured to the wall with an opening. Then you only need a small piece of cable from the computer to run on the front panel.
To use a faceplate to create an Ethernet socket, pull the cable through the hole in the wall and use a cable stripper to remove about an inch of insulation from the cable. If the cable is a patch cable, cut off the connector first.
There are different kinds of faceplates from 1-port to 6-port and more, which also can be in different colors to suit the ambiance of the location. FiberStore provides a more aesthetically pleasing design of network cable faceplate, but it’s not just another pretty face. To balance the increasing cost of electronic parts across many industries, FiberStore continues to pursue cost reduction efforts. Towards that goal, we’ve developed a new front panel design that is easier and more cost effective to manufacture and inventory.
The new faceplate also provides enhanced functionality for the user. Specifically, the design includes labeling of the ports, providing rapid identification of their optical characteristics. Have a wide selection of other Fiber Optic Faceplates and cable assemblies at FiberStore. |
2013 年 7 月 19 日 星期五  |
| Fiber Optic Pigtail Technology Wiki |
分類: 未分類 |
As fiber cable network is built by drawing the long lines of physical cables, it is highly impossible to lay a continuous cable end-to-end. Then there comes the optical fiber pigtail, one of the cable assemblies, has a connector on one end and a length of exposed fiber on another end to melt together with fiber optic cable. By melting together the glass fiber cable, it can reach a minimum insertion loss.
Pigtails are terminated on one end with a connector, and typically the other side is spliced to OSP (Outside Plant Cable). They may be simplex: (single fiber), or multi-fiber up to 144 fibers. Pigtails do have male and female connectors in which male connectors will be used for direct plugging of an optical transceiver while the female connectors are mounted on a wall mount or patch panel. Fiber optical pigtails are usually used to realize the connection between patch panels in a Central Office or Head End and OSP cable. Often times they may also provide a connection to another splice point outside of the Head End or central office. The purpose of this is because various jacket materials may only be used a limited distance inside the building.
You may confused the purpose between fiber optic connector, fiber optic patch cord and fiber optic pigtail. Here we will figure it out.
Fiber optic connector is used for connecting fiber. Using one or two fiber optic connectors in one cable has two items with different assistance in fiber optical solutions.
Fiber optic patch cords(or called fiber jumpers) used as a connection from a patch panel to a network element. Fiber optic patch cords, thick protective layer, generally used in the connection between the optical transceiver and the terminal box.
Fiber Optic Pigtail called pigtail line, only one end of the connector, while the other end is a cable core decapitation. Welding and connecting to other fiber optic cable core, often appear in the fiber optic terminal box, used to connect fiber optic cable, etc.
Fiber optic cable can be terminated in a cross connect patch panel using both pigtail or field-installable connector fiber termination techniques. The pigtail approach requires that a splice be made and a splice tray be used in the patch panel. The pigtail approach provides the best quality connection and is usually the quickest.
Fiber pigtails are with premium grade connectors and with typical 0.9mm outer diameter cables. Simplex fiber pigtail and duplex fiber pigtails are available, with different cable color, cable diameter and jacket types optional. The most common is known as the fusion splice on pigtail, this is done easy in field with a multi-fiber trunk to break out the multi-fibers cable into its component for connection to the end equipment. And the 12 fiber or 6 fiber multi color pigtail are easy to install and provide a premium quality fiber optic connection. Fiber optic pigtails can be with various types of fiber optic terminations such as SC, FC, ST, LC, MU, MT-RJ, MTP, MPO, etc.
Pigtails offer low insertion loss and low back-reflection. They are especially designed for high count fiber fusion splicing. Pigtails are often bought in pairs to be connected to endpoints or other fiber runs with patch cables. |
2013 年 7 月 18 日 星期四  |
| Five Reasons To Say No To OM1 Fiber |
分類: 未分類 |
OM1 fiber “In the multimode fiber sales in North America and around the world are occupied by more than 25% and more than 30%.” Now the question is, why users are suggested to not install 62.5 μm (OM1) fiber in their networks?
The five common reasons that users do not install OM1 fiber:
1. This is just a low-speed network cable extension. If it is more installation is only passive connection (for example, if the new OM1 cable is actually connect to any active devices), using OM3 or OM4 cable. When it comes to upgrade a low-speed link, the new OM3/OM4 fiber can remain in place, but may need to replace the old OM1 cable.
2. OM1 works well in today’s installing speed. Cabling installation means – and it is expected – will last 10 to 25 years. From now on, you will be still running the same speed of 10 to 25 years? The typical network equipment replacement cycle is five years, during the lifetime of optical cable your newly installed, you can expect 2 to 5 times equipment renewal.
3. OM1 is currently assigned. General specification provides a guide for suppliers, but if they do not update, including the recent improvements in technology, they are of limited value. If the current specification has not been updated recently, it can not work well for users.
4. OM1 is cheaper than OM3 cable or om4 cable. Based on the cost first on this is true. But the installation costs are almost the same, sometimes OM1 is higher. And if (or when) for equipments support higher speed must replace OM1, the initial savings are gone.
5. OM1 fiber has a better macrobend performance than 50 μm. Historically, in many cases it is correct for the fiber itself and fiber optic cabling. However, 50 μm fiber cabling attenuation is better than that of 62.5 μm OM1. In addition, the launched bending optimization or bend insensitive multimode fiber making the 50 μm macrobend performance is far superior to 62.5 μm OM1. |
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