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Universal Asynchronous Receiver/Transmitters (UARTs) are integrated circuits that convert bytes from the computer bus into serial bits for transmission. By providing surplus memory in a buffer, UARTs help applications overcome... more/see it nowthe factors that can hinder system performance, providing maximum throughput to high-performance peripherals without slowing down CPUs.
Early UARTs such as 8250 and 16450 did not include buffering (RAM or memory). With the advent of higher-speed devices, the need for UARTs that could handle more data became critical. The first buffered UART was the 16550, which incorporates a 16-byte First In First Out (FIFO) buffer and provides greater throughput than its predecessors.
Manufacturers have been developing enhanced UARTs that continue to increase performance standards. These faster chips provide improvements such as larger buffers and increased speeds. Here are the rates of todays common UARTs:
UART FIFO Buffer Rate Supported
16550 16-byte 115.2 kbps
16554 16-byte 115.2 kbps
16650 32-byte 460.8 kbps (burst rate)
16654 64-byte 460.8 kbps (burst rate)
16750 64-byte 460.8 kbps (burst rate)
16850 128-byte 460.8 kbps (sustained rate)
16854 128-byte 460.8 kbps (sustained rate) collapse
Before Universal Serial Bus (USB), adding peripherals required skill. You had to open your computer to install a card, set DIP switches, and make IRQ settings. Now you can connect... more/see it nowdigital joysticks, scanners, speakers, cameras, or PC telephones to your computer instantly. With USB, anyone can make the connection because everything is automatic! Because USB connections are hot-swappable, you can attach or remove peripherals without shutting down your computer. Also, USB hubs have additional ports that enable you to daisychain multiple devices together. More than 800 leading PC, peripheral, and software manufacturers support USB. collapse
Solid-conductor cable is designed for backbone and horizontal cable runs. Use it for runs between two wiring closets or from the wiring closet to a wallplate. Solid cable shouldn’t be... more/see it nowbent, flexed, or twisted repeatedly. Its attenuation is lower than that of stranded-conductor cable.
Stranded cable is for use in shorter runs between network interface cards (NICs) and wallplates or between concentrators and patch panels, hubs, and other rackmounted equipment. Stranded-conductor cable is much more flexible than solid-core cable. However, attenuation is higher in stranded-conductor cable, so the total length of stranded cable in your system should be kept to a minimum to reduce signal degradation. collapse
Furcating is the process of adding protective tubing to each fiber within a loose-tube cable. It can be a headache-inducing task if you dont have the right tools. If you... more/see it nowbend the cable or buffer tubes past their recommended bend radius, or if you allow them to kink, youll end up with substandard cable connections and splices that can break down over time. And, if the cable is outdoors, it can become exposed to the elements. The end result: a damaged cable without optimal transmission performance.
Thats why a fan-out kit is an absolute must during furcation. These kits enable you to branch out the fragile fiber strands from a buffer tube into protective tubing so you can add a connector. And, you can do it without using splicing hardware, trays, and pigtails.
To separate the fibers, use the kits fan-out assembly, which is color-coded to match the fiber color scheme. The assembly protects the cables bend radius. It also eliminates excessive strain on the fibers by isolating them from tensile forces.
Several types of fan-out kits are available for both indoor and outdoor cross-connects. The outdoor kits include components that compensate for wider temperature fluctuations. Some kits are used to terminate loose-tube cables with 6 or 12 fibers per buffer tube. Others enable you to furcate and terminate more than 200 loose-tube cable fibers, sealing the cable sheath and providing a moisture barrier at the point of termination. These kits require no additional hardware.
Although its recommended that you terminate loose-tube cable at a patch panel, that might not always be possible. For this, there are spider type fan-out kits, which affix a stronger tubing to the bare fiber. The tubing is typically multilayered, consisting of a FEP inner tube that holds the individual fiber, an aramid yarn strength member, and an outer protective PVC jacket. Once you strip back the cable jacket, you thread the fibers into the fan-out inserts. collapse
Get more out of your ServSwitch Multi. Add audio cable, a set of speakers, and a microphone to each CPU. Audio cable turns your ServSwitch Multi into the ideal system... more/see it nowfor education, training, retail, medical, and multimedia office environments.Audio cable isnt just for the ServSwitch Multi either. You can also use it with servers that give off audible alarms. So even if you dont have audio equipment now—plan ahead. When youre ready to add audio equipment, just plug in our audio cable. collapse
This proprietary processing technology developed by Panasonic® eliminates backlighting problems commonly seen with security camera systems. It gives you clear images regardless of the lighting situation and a dynamic range... more/see it nowthats 64 times greater than that offered by conventional video cameras. Super Dynamic II accomplishes this by using a double-speed, charge-coupled device (CCD). It takes two pictures in the time it takes for a conventional CCD to capture one. The first Super Dynamic II picture is a long exposure (1⁄60th of a second) that captures a scenes dark areas; the second is a short exposure (from 1⁄1000th to 1⁄4000th of a second) that captures the scenes bright areas. Super Dynamic II then combines the best quality signals from the two images and outputs them as a Composite analog image.The technologys enhanced Digital Signal Processing (DSP) circuitry corrects gradation to give you proper black level references so black areas within a scene appear blacknot washed-out shades of gray. It also enables images with high contrast to be seen on the screen. Whats more, Super Dynamic II technology provides exceptional sensitivity (0.8 lux using an F1.4 lens), enabling the camera to capture vivid details and color even in low-light applications. collapse
There are two styles of fiber optic cable construction: loose tube and tight buffered. Both contain some type of strengthening member, such as aramid yarn, stainless steel wire strands, or... more/see it noweven gel-filled sleeves. But each is designed for very different environments.Loose tube cables, the older of the two cable types, are specifically designed for harsh outdoor environments. They protect the fiber core, cladding, and coating by enclosing everything within semi-rigid protective sleeves or tubes. In loose-tube cables that hold more than one optical fiber, each individually sleeved core is bundled loosely within an all-encompassing outer jacket.Many loose-tube cables also have a water-resistant gel that surrounds the fibers. This gel helps protect them from moisture, so the cables are great for harsh, high-humidity environments where water or condensation can be a problem. The gel-filled tubes can expand and contract with temperature changes, too. But gel-filled loose-tube cables are not the best choice when cable needs to be submerged or where its routed around multiple bends. Excess cable strain can force fibers to emerge from the gel.Tight-buffered cables, in contrast, are optimized for indoor applications. Because theyre sturdier than loose-tube cables, theyre best suited for moderate-length LAN/WAN connections, long indoor runs, and even direct burial. Tight-buffered cables are also recommended for underwater applications.Instead of a gel layer or sleeve to protect the fiber core, tight-buffered cables use a two-layer coating. One is plastic; the other is waterproof acrylate. The acrylate coating keeps moisture away from the cable, like the gel-filled sleeves do for loose-tube cables. But this acrylate layer is bound tightly to the plastic fiber layer, so the core is never exposed (as it can be with gel-filled cables) when the cable is bent or compressed underwater.Tight-buffered cables are also easier to install because theres no messy gel to clean up and they dont require a fan-out kit for splicing or termination. You can crimp connectors directly to each fiber.Want the best of both worlds? Try a hybrid, breakout-style fiber optic cable, which combines tight-buffered cables within a loose-tube housing. collapse
Alien crosstalk (ANEXT) is a critical and unique measurement in 10-GbE systems. Crosstalk, used in 10/100/1000BASE-T systems, measures the mixing of signals between wire pairs within a cable. Alien Crosstalk,... more/see it nowin 10-GbE systems, is the measurement of the signal coupling between wire pairs in
different, adjacent cables.
The amount of ANEXT depends on a number of factors, including the promixity of adjacent cables and connectors, the cable length, cable twist density, and EMI. Patch panels and connecting hardware are also affected by Alien Crosstalk.
With Alien Crosstalk, the affected cable is called the disturbed or victim cable. The surrounding cables are the disturber cables.
When using a ServSwitch™ with multiple computer platforms, choosing which peripherals to use to control your diverse group of CPUs can be confusing. Because of the wide variation in connector... more/see it nowtypes and compatibilities, there is a hierarchy to follow when choosing your user station keyboard, monitor, and mouse.1. If you have at least one Sun® computer in your application, you should use a Sun keyboard and mouse to control your CPUs. 2. If you have a mixture of PCs and Mac® computers, use your PC-style keyboard and mouse to control your CPUs. collapse
Many headset ear capsules fit awkwardly in the ear and make telephone professionals uncomfortable. If you wear a headset all day, that can really affect productivity. When choosing a headset,... more/see it nowmake sure the ear capsule has a hinge on it. This design enables you to adjust the headset for all-day comfort and better productivity. collapse
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