e-mail this page
Your Information: *
Your Friend's Information: *
Enter a personal Message or send the default message below
A technical expert will call you in 30 seconds. It's live and it's free.
(U.S. and Canada Only)
Photo may show similar product
Switch and convert 10-/100-Mbps copper to 100-Mbps fiber in office areas.
Provides an easy, inexpensive way to extend the reach of your Ethernet network, even in harsh conditions.
Choose from five different ways to power this hardened media converter.
Get Gigabit speeds in a robust industrial media converter.
Tough DIN rail-mountable switch for 10/100 copper.
Tough, industrial-grade switches with a single fiber port and five copper ports.
Metal-encased office network switches with dual fiber ports!
Solid Gigabit switching for industrial environments.
Provides an easy, inexpensive way to extend the reach of your Ethernet network and add ports, even in harsh conditions.
Extend Ethernet over voice-grade UTP cable and provide power to a PoE device.
Extend Ethernet over voice-grade UTP cable and add four Ethernet ports, including two PoE ports.
This tiny media converter is perfect for bringing fiber to the desktop.
This tiny Gigabit converter automatically senses speed on the copper side.
Quickly add Ethernet ports anywhere in your networkeven in harsh outdoor environments.
Tough dual fiber port switches for the wild frontiers of your network!
Switch and convert 10/-100-Mbps copper to 100-Mbps fiber in industrial environments.
These tough, industrial-strength switches feature dual fiber ports.
Works as data rate converter, performing 10-/100-/1000-Mbps speed autonegotiation on the twisted-pair port.
Connect Gigabit Ethernet copper ports to fiber optic cable.
Switch and convert 10-/100-Mbps copper to 100-Mbps fiber optic segments in harsh outdoor environments.
An expert will call you in 30 seconds. It's live and it's free.
E-Mail, Diagnostics, Word Processing, Database
With the rapid development of computer networks over the last decade, high-end switching has become one of the most important functions on a network for moving data efficiently and quickly from one place to another.
Here’s how a switch works: As data passes through the switch, it examines addressing information attached to each data packet. From this information, the switch determines the packet’s destination on the network. It then creates a virtual link to the destination and sends the packet there.
The efficiency and speed of a switch depends on its algorithms, its switching fabric, and its processor. Its complexity is determined by the layer at which the switch operates in the OSI (Open Systems Interconnection) Reference Model (see above).
OSI is a layered network design framework that establishes a standard so that devices from different vendors work together. Network addresses are based on this OSI Model and are hierarchical. The more details that are included, the more specific the address becomes and the easier it is to find.
The Layer at which the switch operates is determined by how much addressing detail the switch reads as data passes through.
Switches can also be considered low end or high end. A low-end switch operates in Layer 2 of the OSI Model and can also operate in a combination of Layers 2 and 3. High-end switches operate in Layer 3, Layer 4, or a combination of the two.
Layer 2 switches operate using physical network addresses. Physical addresses, also known as link-layer, hardware, or MAC-layer addresses, identify individual devices. Most hardware devices are permanently assigned this number during the manufacturing process.
Switches operating at Layer 2 are very fast because they’re just sorting physical addresses, but they usually aren’t very smart—that is, they don’t look at the data packet very closely to learn anything more about where it’s headed.
Layer 3 switches use network or IP addresses that identify locations on the network. They read network addresses more closely than Layer 2 switches—they identify network locations as well as the physical device. A location can be a LAN workstation, a location in a computer’s memory, or even a different packet of data traveling through a network.
Switches operating at Layer 3 are smarter than Layer 2 devices and incorporate routing functions to actively calculate the best way to send a packet to its destination. But although they’re smarter, they may not be as fast if their algorithms, fabric, and processor don’t support high speeds.
Layer 4 of the OSI Model coordinates communications between systems. Layer 4 switches are capable of identifying which application protocols (HTTP, SNTP, FTP, and so forth) are included with each packet, and they use this information to hand off the packet to the appropriate higher-layer software. Layer 4 switches make packet-forwarding decisions based not only on the MAC address and IP address, but also on the application to which a packet belongs.
Because Layer 4 devices enable you to establish priorities for network traffic based on application, you can assign a high priority to packets belonging to vital in-house applications such as Peoplesoft, with different forwarding rules for low-priority packets such as generic HTTP-based Internet traffic.
Layer 4 switches also provide an effective wire-speed security shield for your network because any company- or industry-specific protocols can be confined to only authorized switched ports or users. This security feature is often reinforced with traffic filtering and forwarding features.
Get in touch and stay in touch with Black Box Network Services:
» Contact us
» Get Catalog
Black Box Network Services offers comprehensive communications and infrastructure solutions. Find out what we can do for you:
Find high quality products at the right price. Search and buy from our 118,000+ product catalog:
Black Box Network Services is the world's largest independent provider of communications, infrastructure, and product solutions. Learn more about us: