Posted on December 18, 2013 by bboxadmin
A rack is any freestanding frame that doesn’t have doors or sides. If you need frequent access to all sides of the equipment and cabling, an open rack is more convenient than a cabinet. If your equipment needs ventilation, a rack offers more air circulation than cabinets. With the open design, racks are a good choice in areas where security isn’t a concern, or inside data centers and closets with locked doors. And racks typically cost less than cabinets. There are several things you should consider when choosing a rack.
Types of racks.
The best place to start when picking a rack is to ask yourself: Where will it be located and what equipment will be in it? This will help you determine if you need a wallmount or a floor-mount model and whether you need a 2-post or 4-post rack.
You have a number of options depending on the type of equipment you need to house. If you’re installing patch panels, a two-post rack with some cable management is the right choice. But if you have a mix of networking equipment, servers, and patch panels, then a 4-post rack makes more sense because it provides more stable, 4-point mounting for deep equipment. Accessories are available which allow you to mount both standard and extra-deep equipment.
The main component of a rack is a set of vertical rails with mounting holes to which you attach your equipment or shelves. Most racks come in rails spaced at the standard 19″ with hole-to-hole centers measuring 18.3″. To rackmount smaller equipment, add rackmount adapter brackets. For mounting older legacy equipment, there are 23″ wide racks.
Two-post racks typically have threaded 12-24 or 10-32 holes for quick installation of patch panels, and 4-post racks usually have M6 square mounting holes for mounting servers.
Height, or rack units, is one of the most important specifications in choosing a rack. One rack unit (1U) is 1.75″ of usable space. So, for example, a rackmount device that’s 2U high takes up 3.5″ of rack space. Most freestanding racks come in a standard 45U height, which is 6.5 feet high, so they fit rooms with standard ceilings. But there are other height options— from smaller 10U-high wallmount models all the way up 58U-high units. These tall racks, towering up to 9 feet, allow for an extremely dense installation of equipment while saving floor space. Continue reading
Filed under: Blog Posts | Tagged: choose IT rack, how to pick an IT rack, IT rack, types of IT racks | Leave a comment »
Posted on December 12, 2013 by bboxadmin
Of all the components in your network, none is arguably more underrated than the RJ-45 connector. Simplicity incarnate, this transparent marvel literally defines plug-and-play connectivity—from the desktop to the data center. Yet it defies the obvious: How’d they get those wires in there? Who puts these things together? Where are the seams?
So, in the spirit of demystifying one more aspect of modern-day communications, we give you this behind-the-scenes look at terminating twisted-pair cable using RJ connectors.
The prep work.
First, gather your materials. You’ll need bulk cable, such as the GigaTrue CAT6 550-MHz Solid Bulk Cable, a cable cutter and stripper, a connector, a pre-plug (optional), a crimp tool, and a continuity tester. All these items—except the cable and the pre-plugs—are in our CAT6 and CAT5e Terminations Kit.
The challenge: Do it right the first time.
You must take time to install each connector carefully, according to the specifications of the wiring system you’re installing. Then test each cable to certify that it supports the specified performance levels — in this case, the TIA specs for CATx cabling. The wiring standards illustration (above right) indicates proper T568A, T568B, and USOC pairing and pinning for twisted pair cable. T568B wiring is most commonly used in North America for networking. Continue reading
Filed under: Blog Posts | Tagged: bulk cable, how to terminate patch cable, patch cable, RJ-45 Connector, terminate patch cable, twisted pair cable | Leave a comment »
Posted on December 4, 2013 by bboxadmin
In this security-conscious age, webcams, motion detectors, and badge scanners have become increasingly common elements in most businesses and public facilities. It doesn’t matter if you’re checking ID cards, observing activity in a lobby or community space, or monitoring a building during off-hours for suspicious activity; most mission critical security applications rely on the sort of constant vigilance that can only be supplied by a monitoring device, ID scanner, or electronic sensor.
An intelligently planned electronic security system can monitor badge-in/ badge-out activity, detect movement in buildings during non-work hours, generate alarms when doors are opened in secure areas, and keep watch over huge buildings without the need for regular patrols by ever-present security personnel.
But as useful as these devices are, it’s important to remember that many electronic sensors and monitoring devices do not include power fallback capabilities, and as such, they can often be rendered useless by a simple power interruption. This means that even if your security solution includes the most advanced equipment available, without a reliable power fallback solution, your building can still be left unprotected during a power outage or blackout—or when external power to the security system has been purposely defeated.
Fallback Power Switch, 240-VAC
If your security system or access control application lacks an effective power redundancy solution, fallback power switches can provide fast, reliable power fallback capabilities, without the need to replace existing single power inlet devices with new, dual-inlet devices. The switches can help to minimize or eliminate downtime for your security system by ensuring that even when your main power source is not available, the security system can automatically switch over to a back-up power source almost instantaneously. Continue reading
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Posted on November 26, 2013 by bboxadmin
By Fluke Networks
Because cleaning has been part of fiber maintenance for years, most people have their own approaches for cleaning end-faces. However, beware of bad habits. Many have developed in the industry over time. With an evolving base of knowledge, the industry has moved recently towards new best practices.
One common approach to cleaning end-faces is to blast them with canned air, either on a connector inside a port. Canned air is only effective on one type of contaminant: large dust particles. Canned air is ineffective not only on oils and residues but also on smaller, charged dust particles. Moreover, canned air will tend to blow large particles around inside ports rather than carefully remove them.
Traditionally, dry cleaning is proven to be only partially effective in eliminating contaminants from fiber end-face and connectors. The challenges had been that the dry cleaning materials are either not good enough to uplift the various types of dirt or greasy contaminants over fiber end-faces, or they actually introduce static to the fiber ferrule that attract dust. Technological advancements and better dry cleaning materials introduce a new class of fiber cleaning tools that are cost effective and efficient in cleaning more than 50% of contaminants from fiber. These tools become a perfect complement to the fiber wet cleaning solution to cover the cleaning needs in almost all situations and environments.
The newly developed dry cleaning tool provides an economical and easy way to remove contaminants from fiber end-faces.
Use of solvent
Some contaminants, like greasy and sticky materials, are difficult to uplift without the use of a solvent. Solvents provide multiple benefits, the most important being their ability to dissolve dried contaminants that have adhered onto the end-face. In addition, solvents will envelop particles and debris to effectively lift them from the ferrule surface so that they can be carried away without damaging the end-face. Last, solvents will prevent a static charge from developing during cleaning with a dry wipe or reel that are not optimized for dry cleaning. There are many stories of end-faces becoming statically charged during solvent-free cleanings such that they were strongly attracting static-charged dust floating in the air. The developed charge can be so strong that static dust accumulates on the end-face during the short move from a microscope into port. Continue reading
Filed under: Blog Posts | Tagged: fiber end-faces, fiber maintenance, Fiber Optic, how to clean fiber end-faces | Leave a comment »