Posted on February 27, 2012 by Meghan Damico
Multimode, 50- and 62.5-micron cable—Multimode cable has a large-diameter core and multiple pathways of light. It comes in two core sizes: 50-micron and 62.5-micron.
Multimode fiber optic cable can be used for most general data and voice fiber applications, such as bringing fiber to the desktop, adding segments to an existing network, and in smaller applications such as alarm systems. Both 50- and 62.5-micron cable feature the same cladding diameter of 125 microns, but 50-micron fiber cable features a smaller core (the light-carrying portion of the fiber).
Although both can be used in the same way, 50-micron cable is recommended for premise applications (backbone, horizontal, and intrabuilding connections) and should be considered for any new construction and installations. Both also use either LED or laser light sources. The big difference between the two is that 50-micron cable provides longer link lengths and/or higher speeds, particularly in the 850-nm wavelength.
Single-mode, 8–10-micron cable—Single-mode cable has a small 8–10-micron glass core and only one pathway of light. With only a single wavelength of light passing through its core, single-mode cable realigns the light toward the center of the core instead of simply bouncing it off the edge of the core as multimode does.
Single-mode cable provides 50 times more distance than multimode cable. Consequently, single-mode cable is typically used in long-haul network connections spread out over extended areas, including cable television and campus backbone applications. Telcos use it for connections between switching offices. Single-mode cable also provides higher bandwidth, so you can use a pair of single-mode fiber strands full-duplex for up to twice the throughput of multimode fiber.
Here is a breakdown of specifications:
Filed under: IT Infrastructure | Tagged: 50 micron, 62.5 micron, fiber optic cable, fiber standards, single-mode | Leave a comment »
Posted on February 23, 2012 by Meghan Damico
Network access control
(NAC) prevents unauthorized devices from connecting to your network through data ports—which are inside your network. Unauthorized users can plug in, but with a NAC in place, they can’t connect.
From now until March 31st, register to win your own Veri-NAC 5220. We’re giving away five!
Protect your customers’ information. Register to win a Veri-NAC 5220 for your small network, and protect your network from vulnerabilities firewalls can’t defend against.
For official contest rules click here.
Good luck to all!
Filed under: Networking | Tagged: Contest, NAC, Veri-Nac | Leave a comment »
Posted on February 3, 2012 by Meghan Damico
, as part of its continuing program to identify counterfeit cable, has an Authenticator Card that can be used to identify genuine gold holographic labels. This special credit card-sized device can be used to better identify counterfeit products with illegitimate UL holograms. The card has a special window on it. When moved across the special UL logo made with color-shifting ink, the UL should appear and disappear. To get the Authenticator Card, go to ul.com/marks
, use the Label Order form, and the part number 1000-S0132. Or you can call any Label Center
listed on their Web site. The cards will also be available at the BICSI Winter Exhibition and Conference
, February 12-16 in Orlando, FL.
The UL Website lists the distinct features of the UL hologram introduced in 2009. They are:
- A gold background to help U.S. Customs officers and other law enforcement agencies, distributors, retailers, and consumers quickly identify the new label.
- Color-shifting ink similar to that in the new U.S. paper currency.
- Repeating pattern of floating UL symbols, a distinctive burst pattern around one of the floating UL symbols, and wavy lines.
- Additional covert security features to assist with the authentication of a UL holographic label.
Filed under: IT Infrastructure | Tagged: authenticator card, cable, counterfeit cable, holographic labels, UL | Leave a comment »