JetDirect Devices are pass through devices that allow you to connect printers to the network without going through a PC. They can be internal or external to the printer. Remember that they never alter the data.
Friday, January 16, 2009
Patch Panel
Patch panels available in 12 through 96 port configurations, and can be daisy chained together. They are like a “Super Hub”.
Bridges
Bridges link LANs so that data from one network can pass through to another network. Like routers, bridges are used to segment networks, but are not as restrictive. They are usually used on IPX/SPX networks.
Router
A router is used to segment a network to reduce traffic. It is also used as a security measure. Routers are predominately used in TCP/IP networks.
Repeaters
Repeaters amplify or refresh the stream of data, which deteriorates the farther it travels from your PC. Repeaters let the data signals reach more remote PC’s, that may exceed IEEE cabling standards.
File Server
A file server is usually a high-performance PC with a large hard drive or multiple hard drives with large quantities of RAM. The file server is not used exclusively by any individual on the network. The server is often used to store files and/or applications so they can be readily accessible to the entire network. It can also direct/process print jobs. Example: Windows Terminal Server (WTS), Point and Print, and Client/Server.
Network Cables
Unshielded Twisted Pair with RJ45 Connectors
Shielded Twisted Pair with DB9 Connectors and IBM Data Connector
Coaxial Cable with BNC Connectors
Fiber-Optic Cable
Fiber-Optic Cable
Fiber optic (or "optical fiber") refers to the medium and the technology associated with the transmission of information as light impulses along a glass or plastic wire or fiber. Fiber optic wire carries much more information than conventional copper wire and is far less subject to electromagnetic interference. Most telephone company long-distance lines are now fiber optic.
Wireless Topology
802.11 & Bluetooth
Uses radio frequencies instead of wire
Advantages:
Mobile
No cabling
Inexpensive
Disadvantages:
Security
Environmental interference
Thursday, January 15, 2009
Hub
Hubs are used to connect workstations, printers, servers, etc. together. Tthat hey are pass-through devices do not ever modify the data.
Topologies
A topology is the network configuration. The design or style determines the type of hardware you are going to use.
There are four basic network topologies.
1. Star Ethernet
2. Bus
3. Ring
4. Wireless
Rules
1. Never assume
2. Draw a picture. (Draw as much detail as possible and take good notes.)
3. Ask “What’s wrong?”. If the customer tells you there are several things wrong, ask them which is the most important. In many cases once you fix the important problem, the smaller problems are also resolved.
4. What is the print path?
5. Get down to a workable level. Once you know the print path, eliminate all unnecessary items.
6. When you recreate, recreate with a new and unique name.
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