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  • Manual... 
  • Wireless Ethernet Extender Kit User Manual
    User Manual for the LWE200A-KIT, LWE200A-AP, LWE200A-S (Version 1)
 
  • Manual... 
  • MultiPower Miniature Media Converter, SFP-to-SFP Mode Converter
    (Version 1)
 

Black Box Explains...Layer 3 switching.

In the last decade, network topologies have typically featured routers along with hubs or switches. The hub or switch acts as a central wiring point for LAN segments while the... more/see it nowrouter takes care of higher-level functions such as protocol translation, traffic between LAN segments, and wide-area access.

Layer 3 switching, which combines Layer 2 switching and Layer 3 IP routing, provides a more cost-effective way of setting up LANs by incorporating switching and routing into one device. While a traditional Layer 2 switch simply sends data along without examining it, a Layer 3 switch incorporates some features of a router in that it examines data packets before sending them on their way. The integration of switching and routing in a Layer 3 switch takes advantage of the speed of a switch and the intelligence of a router in one economical package.

There are two basic types of Layer 3 switching: packet-by-packet Layer 3 (PPL3) and cut-through Layer 3.

PPL3 switches are technically routers in that they examine all packets before forwarding them to their destinations. They achieve top speed by running protocols such as OSPF (Open Shortest Path First) and by using cache routing tables. Because these switches understand and take advantage of network topology, they can blow the doors off traditional routers with speeds of more than 7,000,000 (that’s seven million!) packets per second.

Cut-through Layer 3 switching relies on a shortcut for top speed. Cut-through Layer 3 switches, rather than examining every packet, examine only the first in a series to determine its destination. Once the destination is known, the data flow is switched at Layer 2 to achieve high speeds. collapse

  • Manual... 
  • High-Density Media Converter System II User Manual
    User Manual for LMC5022C-R3, LMC5023C-R3, LMC5026C-R3, LMC5027C-R3, LMC5110C-R3, LMC5111C-R3, LMC5113C-R3, LMC5114C-R3, LMC5116C-R3, LMC5117C-R3, LMC5180C-R3, LMC5181C-R3, and LMC5182C-R3 (1)
 

Black Box Explains...Using repeaters to extend your network.

A repeater is a signal regenerator. It amplifies and regenerates received data and relays data from one length of cable to another—this can be between two segments of the same... more/see it nowcable type (such as UTP to UTP) or between two lengths of entirely different cable types (such as UTP to ThinNet). Because repeaters operate at the Data Link layer of the OSI model, having too many repeaters on a network introduces delays and causes problems with signal timing. Ethernet allows a maximum of two IRLs (InterRepeater Links) between any two devices and up to four per network. A hub also counts as a repeater. (If simple media conversion is your goal, use media converters instead. For details, contact Tech Suport.)

Repeaters boost distance by amplifying the signal.
A repeater actually regenerates and amplifies the signal to gain distance. The repeater not only changes the media type, it also gives the signal a boost to send it over a longer distance.

Repeaters boost distance through a change in media.
In addition to amplifying the signal, a repeater can also add distance to your network by enabling you to change to a media type such as fiber that supports longer distances. collapse


Product Data Sheets (pdf)...Mixed-Media Fiber Hubs


Product Data Sheets (pdf)...SmartPath Enterprise Wireless

  • Application Note... 
  • Black Box Multicast Video-over-IP Solution
    MediaCento IPX and LGB Series Ethernet Switches (Version 1)
 

Product Data Sheets (pdf)...Express Ethernet Switches


Product Data Sheets (pdf)...Enhanced TCP/IP Terminal Servers

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