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Networking

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Check Out Our Resources

Black Box Explains

Black Box Explains... Why go wireless?
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• It’s great for communicating in harsh climates or in areas where it’s expensive to run cable. Wireless solutions are well suited for use in military applications, farming, refineries, mining, construction, and field research.
• Because sometimes you just can’t run wire, like in historic buildings or hazmat areas.
• When it’s physically or legally impossible to support conventional hard-wired RS-232 communications, wireless networking may be your only answer.
• It gives you quick, temporary connections at trade shows, and fast reconfigurations—even troubleshooting or remote field testing.
• It provides reliable disaster relief when all else fails! Count on wireless networks to maintain mission-critical links when disaster strikes.
• It’s more affordable, more reliable, and faster than ever before.
• Best of all, no FCC licensing required!

Why go wireless?
Black Box Explains...Link loss.
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Media converters solve the problem of connecting different media types in mixed-media networks. In order to comply with IEEE standards, they implement IEEE data-encoding rules and the Link Integrity Test.

For a twisted-pair segment, a link is a signal sent by the converters when the cable is in use. If no Link Integrity Test signal is received, the connected device assumes that the link is lost.

With fiber cable, a connected device checks a line by monitoring the Link Integrity Test signal from the converter and the power of the light being received. If the light’s power drops below a certain threshold, the link is lost. In either case, link loss usually results from a broken cable, which is the cause of approximately 70% of all LAN problems.

Link loss is often indicated by an LED on a connected network device. You can also monitor a link with network-management software, such as SNMP, which sends a TRAP (alert) to the management workstation when the link is lost.

Media converters actually function as two separate Multistation Access Units (MAUs). For example, one monitor is a twisted-pair segment and one monitor is a fiber segment. If a fiber cable is broken and the link is lost, a network manager on the twisted-pair end won’t know there’s a problem until users on the fiber side report it.

To solve this problem, Black Box® Modular Media Converters feature a unique Link-Loss capability. This enables the link status on one segment to reflect the link status of the other segment. So if the link is lost on the fiber side, the link is disabled on the UTP segment as well. And the converters will send an SNMP TRAP indicating the loss of link to the management workstation.

Link loss.
Black Box Explains…Using network cameras.
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Using a network camera with a built-in Web server, you can check images, control the camera remotely, and store and save images—all without having to use a PC.

Unlike USB cameras, network cameras can be installed on the ceiling, on a wall, or even outdoors if they have wireless capability. USB cameras, by contrast, can be only placed near a PC and have no wireless capability. What’s more, there’s no limit to the number of network cameras you can install, but it’s often difficult to install multiple USB cameras.

Network cameras also provide a lot more flexibility than USB cameras do when it comes to monitoring. You can check network cameras from a PC, a cell phone that can connect to the Internet, or even a TV. In contrast, you can only monitor USB cameras from a PC.

Small offices, mid-sized businesses, and homes are ideal environments for network cameras. Businesses will find them very useful for facility and parking lot surveillance and two-way communication with off-site branch offices (which cuts down on travel time for routine visits). Entertainment establishments can also use network cameras. Their CCD sensors enable security staff to clearly see patrons on dance floors and at bars, and managers are able to see employees and keep them on their toes.

Network cameras are also great for keeping an eye on children, pets, and your home itself from virtually anywhere. Some network camera systems can be programmed to send an image to an office PC or cell phone when a change is detected in a user’s house. Wireless camera monitoring systems can even enable viewers to check out their entire house on a TV screen.

Using network cameras.
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