- A jack isn’t installed on the bottom five CM of a wooden baseboard: bottom plate of the wall will prevent you from pushing the box into the baseboard
- Turn off the power to the area is most important thing to do before you work in walls, ceilings or attics
- Wiring sequence is critical when RJ-45 jacks are used at the telecomm outlet in a horizontal cabling scheme
- Cut-sheet - a rough diagram that shows where the cable runs are located
- The cable itself is labeled at each end when running a cable from the wiring closet to wall jacks
- When preparing to run cable, label the boxes and cables
- Tie wraps are used to mount cables to a wall
- Decorative raceway should be used if it will be visible in the room
- If an existing raceway already contains a power cable, you should not route more
- Personal safety precautions before you install cable: wear long sleeves, wear long pants, check for power cables
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GirlGeekteete dotNet Tags: LAN, design, networks, cable
Technorati Tags: LAN, design, networks, cable
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Store and Forward
With this method, the LAN switch copies the entire frame into buffers. The CRC (Cylic Redundancy Check) is checked. If there is an error, if it is a runt frame (< 64 bytes) or if its a giant frame ( > 1518 bytes), then it is discarded. If there are no errors, the switch looks up the destination address and forwards the frame. Because it copies all of it, latency can vary and can be longer than other methods.
Cut Through
The LAN switch only copies the destination address (The first 6 bytes following the preamble) into its buffers. It looks up the destination address in its tables and forwards the frame. Latency is less, because the whole frame is not copied first.
Fragment Free (Modified Cut Through)
In this version of the cut-through, the switch waits for the collision window (64 bytes) to pass before forwarding. If a packet has an error, usually it is in the first 64 bytes. This provides better error checking than cut-through mode and has almost no increase in latency.
802.1d STP - detects and eliminates loops in routed networks; Sends out BPDU’s - Bridge Protocol Data Units
VLAN: Virtual LANs - Create logical networks by location, function or department. Done with a switch using Frame Tagging (Switches if you sue
ISL)
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GirlGeekteete dotNet Tags: store and forward cut through lan local area network crc cylic redundancy check error latency address bytes preamble buffer fragment free modified cut through 802.1 stp sheilded twisted pair bpdu bridge protocol data units vlan virtual local area networks frame tagging switching isl No Comments »