-Port PoE PD Switch (Unmanaged, 10BASE-T/100BASE-TX) Manual
Manual for the LPE108AE (Version 1)
Black Box Explains...Layer 2, 3, and 4 switching.
The Open Systems Interconnection (OSI) Reference Model provides a layered network design framework that establishes a standard so that devices from different vendors work together.
Layer 2 (The Data-Link Layer)
Layer 2... more/see it nowswitches 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 arent very smart.
Layer 3 (The Network Layer)
Layer 3 switches use network or IP addresses that identify locations on the network. Physical addresses identify devices; network addresses identify locations. A location can be a LAN workstation, a location in a computer’s memory, or even a packet of data traveling through a network.
Network addresses are hierarchical. The more details included, the more specific the address becomes and the easier it is to find.
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. However, because Layer 3 Switches take the extra time to read more details of a network address, they are sometimes much slower than Layer 2 Switches.
Layer 4 (The Transport Layer)
Layer 4 of the OSI Model coordinates communications between systems. Layer 4 identifies which application protocols (HTTP, SNTP, FTP, etc.) are included with each packet and uses 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 a packet belongs to.
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. collapse
Web Smart Gigabit Ethernet Switch (24-Port) User Manual
User Manual for the LGB624A (Version 2)
28-Port Gigabit Ethernet Managed Switch Firmware
Firmware for the LGB5028A (Version v2.00)
Black Box Explains...Virtual LANs (VLANs).
True to their name, VLANs are literally virtual LANs—mini subLANs that, once configured, can exist and function logically as single, secure network segments, even though they may be part of... more/see it nowa much larger physical LAN.
VLAN technology is ideal for enterprises with far-reaching networks. Instead of having to make expensive, time-consuming service calls, system administrators can configure or reconfigure workstations easily or set up secure network segments using simple point-and-click, drag-and-drop management utilities. VLANs provide a way to define dynamic new LAN pathways and create innovative virtual network segments that can range far beyond the traditional limits of geographically isolated workstation groups radiating from centralized hubs.
For instance, using VLAN switches, you can establish a secure VLAN made up of select devices located throughout your enterprise (managers workstations, for example) or any other device that you decide requires full access to the VLAN youve created.
According to Cisco, a VLAN is a switched network logically segmented by functions, project teams, or applications regardless of the physical location of users. You can assign each switch port to a different VLAN. Ports configured in the same VLAN share broadcasts; ports that dont belong to the VLAN dont share the data.
VLAN switches group users and ports logically across the enterprise—they dont impose physical constraints like in a shared-hub architecture. In replacing shared hubs, VLAN switches remove the physical barriers imposed by each wiring closet.
To learn more about smart networking with VLANs, call the experts in our Local Area Network Support group at 724-746-5500, press 1, 2, 4. collapse
Product Data Sheets (pdf)...Hardened Media Converter Switches
Product Data Sheets (pdf)...Managed Fiber Switches
26-Port PoE+ Gigabit Managed Switch Eco Firmware
Firmware for the LPB2826A (Version v1.59)