Black Box Explains...NEMA ratings for enclosures.
Product Data Sheets (pdf)...Comm Cabinets
The National Electrical Manufacturers Association (NEMA) issues guidelines and ratings for an enclosure’s level of protection against contaminants that might come in contact with its enclosed equipment.
There are many numerical... more/see it nowNEMA designations; we’ll discuss NEMA enclosures relevant to our on-line catalog: NEMA 3, NEMA 3R, NEMA 4, NEMA 4X, and NEMA 12.
NEMA 3 enclosures, designed for both indoor and outdoor use, provide protection against falling dirt, windblown dust, rain, sleet, and snow, as well as ice formation.
The NEMA 3R rating is identical to NEMA 3 except that it doesn’t specify protection against windblown dust.
NEMA 4 and 4X enclosures, also designed for indoor and outdoor use, protect against windblown dust and rain, splashing and hose-directed water, and ice formation. NEMA 4X goes further than NEMA 4, specifying that the enclosure will also protect against corrosion caused by the elements.
NEMA 12 enclosures are constructed for indoor use only and are designed to provide protection against falling dirt, circulating dust, lint, fibers, and dripping or splashing noncorrosive liquids. Protection against oil and coolant seepage is also a prerequisite for NEMA 12 designation. collapse
Elite Server-Mount Cabinet Heavy-Duty Solid Shelf User Manual
User Manual for the RM590-R2 and RM591-R2 (Version 2)
Product Data Sheets (pdf)...Bracket Master
Product Data Sheets (pdf)...Elite Cabinet and Rack Enclosures
4-Post Rack User Manual
User Manual for the RM7000A-R2, RM7001A-R2, RM7002, RM7003A-R2, RM7004A-R2, RM7005A-R2, RM7006, RM7007, RM7008A-R2, and RM7010 (Version 3)
AlertWerks%X99 ServSensor V4EL User Manual
User Manual for the EME149A-20, EME149A-60, EME149D-20, and EME149D-60 (Version 1)
Black Box Explains…Cooling blade servers.
Blade servers are hot. Really hot. These slim, high-powered CPUs generate heat like nothing you’ve ever installed in your data center before—a rack of blade servers can generate more heat... more/see it nowthan an electric oven! And as temperatures rise, servers may fail, leading to downtime and even data loss.
Needless to say, blade servers present
a cooling challenge. If you plan to install them, you need to make sure you can accommodate their cooling needs.
Computer rooms have special equipment such as raised-floor cooling systems to meet their high cooling requirements, but it’s also important to ensure that cabinets used to house blade servers provide adequate ventilation—even in a cool room, hot spots can develop inside cabinets if air distribution is inadequate.
If you’re planning to install blade
servers or other high-density components
in cabinets, look for a cabinet with fully perforated doors in the front and rear—
the greater the amount of perforation,
the more cool air can be delivered to the components.
Don’t overload the cabinet by trying
to fit in too many servers—75% to 80%
of capacity is about right. Leave at least 1U of space between rows of servers for front-to-back ventilation. And finally, ensure all unused rack space is closed off with blank panels to prevent recirculation of warm air back to the front of the cabinet.
If you need help calculating your system’s cooling needs, contact our FREE Tech Support.
Black Box Explains...Remote access.
Remote access is the ability to access a network, a personal computer, a server, or other device from a distance for the purpose of controlling it or to access data.... more/see it nowToday, remote access is usually accomplished over the Internet, although a local IP network, telephone lines, cellular service, or leased lines may also be used. With today’s ubiquitous Internet availability, remote access is increasingly popular and often results in significant cost savings by enabling greater network access and reducing travel to remote sites.
Remote access is a very general term that covers a wide range of applications from telecommuting to resetting a distant server. Here are just a few of the applications that fall under the remote access umbrella:
Remote network access
A common use for remote access is to provide corporate network access to employees who work at home or are in sales or other traveling positions. This kind of remote access typically uses IPsec VPN tunnels to authenticate and secure connections.
Remote desktop access
Remote desktop access enables users to access a computer remotely from another computer and take control of it as if it were local. This kind of remote control requires that special software—which is included with most operating systems—be installed and enabled. It’s often used by those who travel frequently to access their “home” computer, and by network administrators for remote server access. This remote access method has some inherent security concerns and is usually incompatible with firewalls, so it’s important to be aware of its limitations and use adequate security precautions.
Remote KVM access
A common application in organizations that maintain servers across multiple sites is server administration through an IP-enabled KVM switch. These IP-addressable switches support one or more servers and have an integral Web server, enabling users to access them over the Internet through a Web browser. Because they’re intended for Internet use, these switches offer authentication and encryption for secure connections.
Remote power management
Anyone who’s ever had to get out of bed in the middle of the night to go switch a server off and back on again to reset it can appreciate the convenience of remote power management. Remote power managers have a wide range of capabilities ranging from simple power switching to reboot a device to sophisticated power monitoring, reporting, and management functions.
Remote environmental security monitoring
Remote environmental and security monitoring over the Internet is increasingly popular, largely because of the cost savings of using existing network infrastructure rather than a proprietary security system. This application requires IP-addressable hubs that support a variety of sensors ranging from temperature and humidity to power monitors. Some models even support surveillance cameras.
4 Post Steel open Rack
Users Manual (Aug-08)