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Archive for the ‘Extended Network’ Category
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Sunday, July 25th, 2010The Job of a Network Engineer
Wednesday, July 21st, 2010The availability of jobs for engineers and network administrators is expected to grow by over 27% annually from 2004 to 2014, according to data released by the Bureau of Labor Statistics. A network engineer can also be specified as a network administrator, systems administrator, network analyst, network designer, network architect, WAN administrator, LAN administrator, systems administrator, network operations analysts, or Technical network. The main task of a network engineer is implementing and controlling the systems and the transfer of data within an organization or between companies. Computer networks are used by companies to collect and process data, Internet access and web-based services, and share files and resources. The network engineer serves as a civil engineer and a policeman directing traffic on the information highway.
The function of a network engineer jobs engineering network design and maintenance of hardware and software components of computer networks. Network engineers are specialists in the construction and maintenance of local area networks (LAN) or wide area networks (WAN). All elements within the system to an IT organization, including individual desktops, file servers, mail servers, backup servers, application servers, workstations, custom design and more on the field network engineering work.
Here are some of the tasks of network engineers commonly do:
* Choice of hardware and software solutions to organizational needs
* Implementation of hardware, software and utilities
* Analysis and resolution of system problems, including compatibility problems
* Analysis of organizational needs
* The construction of networks to support organizational needs
* The resolution of the problems and ensure smooth network
* The upgrade equipment and systems
* Maintain network security and data
* User accounts and passwords set
* The training provides the best compatibility
* Documentation of problems and solutions
* Network Design and Analysis
* Objectives of research of existing networks or new
* Existing information networks and IT solutions
* Network design to maximize productivity
* Monitoring Network to identify and establish regular patterns of behavior
* Protect and extend equipment life
* Educating end users
The skills of a network engineer
Network technicians must possess a technical background, a systematic understanding of hardware, operating systems and applications and technical knowledge of network hardware and software. A network engineer in general, should have:
* Understanding of networking principles and factors that influence
* Deep knowledge of routing protocols and switching technologies
* Understanding of network security systems, strategies and procedures (repeat)
* The specific knowledge of WAN / LAN infrastructure
* Domain scripting languages
* Skills for server products and technologies
* Familiarity with industry protocols
* Experience with IP addressing, including subnetting
* Experience with router troubleshooting, switches and fault tolerant or redundant environments
* Hardware Maintenance Skills
* Strong communication skills
* Justification
* Ability to decision
Hours of work and the environment
This is the standard for network engineers to work 40 hours a week. However, the time spent on the installation of new equipment or carry out maintenance work often goes beyond the normal working hours. Engineering work environments are usually underground network.
How to become a network engineer?
Network engineers typically have backgrounds and degrees or higher qualifications. Certification of institutions and organizations such as Microsoft and Cisco have a weight with employers. Engineering fields of different origins in technologies related to network design or specialized operations, and can only be carried network engineers. Many colleges and universities offer degrees in network engineering. There are also network management and network engineering programs at several institutions of higher education. technical networks often updated with the acquisition of specialty certifications from industry organizations such as Microsoft.
The outlook for network engineers
As mentioned above, the employment prospects for network engineers is expected to grow at a rate exceeding 27% annually. The average of the ranks of network engineers $ 50,000 to $ 70,000 a year. Engineering Crossing
Extending The Range Of Wireless Networks
Saturday, July 17th, 2010Despite a radio station is limited in scope, wireless extension points can be set to increase its signal and make the network reach much larger. These wireless extension points are commonly known as repeaters.
Several companies have begun to produce wireless repeaters, even though these devices are not part of wireless. Wireless repeaters are designed to solve some problems with wireless coverage. As far away from where the wireless signal originates, the weaker the signal becomes. Finally, you can not get the signal to everyone, regardless of what equipment you have. The problem is sometimes addressed by running wires out on the network coverage is desired, then ‘every gust “from time to time using a wireless access point. This is usually more trouble than it’s worth it, because the idea behind a wireless network is to prevent the installation of cables! wireless repeaters to solve the problem in a much better.
Wireless repeaters work as a relay and receive wireless signals exist and make them stronger. This makes the scope of a larger signal at a time. If the repeaters are placed correctly, you can move computers a considerable distance from the cable network, the router or access point, for example, without failure. The only requirement of this provision is that the extension points must overlap a repeater can not repeat the signals it receives. Since wireless networking signals are essentially radio signals repeaters take all the radio signals they receive a specific frequency and power used to amplify the signals and retransmits them. The signal is not degraded in this process, so it can be repeated as many times as necessary.
Theoretically, wireless repeaters can be placed in a line of several kilometers, extending the network at the moment, and the extension because these points are not complicated technology made computers, are much cheaper than routers or access points . Some companies combine repeaters and antennas in the direction of the wireless LANs that are several miles away. This method is cheaper than taking the trouble to connect via the Internet or install their lines underground. In the future the technology could create wireless repeater covering entire cities.
As consumers are currently limited to getting your repeater of large manufacturing companies such as Linksys and D-Link. These companies call their repeaters with different names, including the range of Linksys Expander and D-Link Range Extender. There are several issues to consider when buying a wireless extension point. Most importantly, make sure it is compatible with your computer you have. Because there is no standard for wireless extension points, it is better to stick with the same company that makes the rest of your team, or at least to test whether the new team to work with the system. You should also know whether an extension point has no Ethernet port. Although this is not necessary to include, is useful if you want to link the extension of a wired network. This problem arises in the bottom if you want to connect two wireless local area networks.
It’s your library:
Tuesday, July 13th, 2010
Image taken on 2008-03-05 12:09:48 by Timothy Greig.
minny me is your extended network.
Sunday, July 4th, 2010
i think im dumb.
Myspace Default Sculpture – In Your Extended Network
Wednesday, June 30th, 2010
Started with a goofy animated GIF made back in August. It took a few weeks to build the sculpture using slabs of rolled out clay. Fired ‘em up, set ‘em up, and took video at the gallery. Finally edited clips together into a movie. Ya’d think I knew what the hell I was doin’… wouldn’t ya?
Protecting your KVM and Video Extenders from Electromagnetic Noise
Saturday, June 26th, 2010KVM (keyboard, video and mouse) via CAT5 extenders can be used to remove computers from harsh environments or sensitive, or to restrict physical access to your computer. Extended Video products such as VGA, DVI, S-Video or HDTV via CAT5 extenders are used to extend the video screens. Each extension consists of two units – local and remote units, which are interconnected by a cable CAT5/5e/6. The low cost and ease of installation of twisted pair cables, such as, cat5, cat5e or CAT6 cable, made them a popular choice over traditional coaxial cable for transmission of KVM and AV signals. However, using a type of twisted-pair cable that is not appropriate for your installation environment can lead to irregular performance of the mouse or keyboard, data loss and degradation of image quality, effectively undermine the purpose your workstation or video extension. One of the causes of the video signal and loss of quality when using a twisted pair infrastructure is an installation environment with extreme electromagnetic interference (EMI or also known as radio frequency interference or RFI.)
Electromagnetic interference
Electromagnetic interference is an unwanted disturbance in an electrical circuit by electromagnetic radiation from an external source. All electrical equipment produces electromagnetic radiation during operation. The current flowing in a circuit generates a magnetic field. The potential difference or voltage required for current flow produces an electric field. Strong electric and magnetic fields can cause an electrical device to affect another. When this is not intentional, is known as electromagnetic interference, commonly abbreviated as EMI. electromagnetic interference can disrupt normal operation of electronic equipment. normal levels of EMI such as those generated by computer, switch or router will not affect NTI KVM and video extenders. However, the extreme levels of EMI on the environment can interfere with signal transmission. This can lead to distortion and loss of video image. The longer the cable, and focus less attention to the installation of cables, the more likely the effect of EMI. Some common sources of EMI are in a large building air conditioners, elevator motors, generators, radio transmitters and welders. Installing the cables near large power transformers or near (less than one foot) fluorescent lamps can also cause problems with EMI.
As EMI affect video signals
EMI affects both audio and video signals. In audio signals, environmental information obscure low-level details. In video signals, interference and signal distortion manifests itself in different ways. Figure 1 shows an image without any interference. Figure 2 shows a waveform of the video signal without interference.
Figure 1: Normal File – No interference
Figure 2: Representation of a video signal without interference
The noise from sources such as air conditioners, elevator motors, generators etc. manifests itself as spots or lines of noise, as shown in Figure 3. This is caused by electric and magnetic fields generated in the engine. The bigger engine, bigger and electric field and magnetic fields. Stop the engine and quickly, can cause interference. Figure 4 shows a waveform of the video signal with the interference of a motor.
Figure three: Interference caused by a motor
Figure 4: Representation of interference from the video signal of an engine
Torn and distorted image as shown in Figure 5 is caused by running the cables near sources of strong magnetic fields, such as large power transformers and fluorescent lights. The wires should be close (less than 1 foot) from the fluorescent lights interference. Figure 6 shows a waveform of the video signal is affected by a strong magnetic field.
Figure 5: The interference from fluorescent lights
Figure 6: Representation of interference from the video signal of a magnetic field
A visible pattern of interference lines, as shown in Figure 7 is the result of interference sources such as radio transmitters. The radio signal must be strong and close to allow it to interfere with the video signal is transmitted over a twisted pair. Figure 8 shows a waveform of the video signal with the interference of radio transmitter.
Figure 7: the interference of a radio station
Figure 8: Performance of a video signal transmitter with radio interference
Protect video signals EMI
A simple, convenient to prevent EMI from interfering with the signal transmission is to use a shielded cable to transmit the signal. Shielded cables are offered in a wide range of designs. Any type of shielded cable construction offers distinct advantages that should be considered carefully when choosing the best and most cost efficient option for a particular application. Braid Shield: Shield in a braid twisted pair, as shown in Figure 9, provides effective protection solutions in audio and RF ranges. It also provides excellent structural integrity, while maintaining good flexibility. Braid shields are better than aluminum to minimize low-frequency interference and have lower resistance of the DC.
Figure 9: Braid shielded twisted pair cable
Foil Shields, a shield of twisted pair, shown in Figure 10, provides excellent protection against electromagnetic interference and radio frequency audio. Weigh and cost less than braided shields.
Figure 10: Shielded Foil Twisted Pair
Due to its small size, the aluminum shields are commonly used to protect the individual wire pairs from several pairs to reduce crosstalk. Drain wires are usually used with the blade shield termination facility for connecting the socket. Combination Foil / Braid Shields: A screen twisted pair combination paper / braid, shown in Figure 11, provides the most effective shield over the entire frequency spectrum. The role of the combination / braid combines the benefits of a coverage of 100 percent aluminum with strength and low DC resistance of a braid.
Figure 11: Foil and braid screened cable pair Twist
How to help reduce the problems of protection against EMI
Reflection and absorption are the main ways in which significantly reduces EMI shielding strength of signal carrying conductors in a twisted pair shielded. Figure 12 is a representation of how the cable may reflect the high frequency EMI, as a radio transmitter. The shield itself also absorb the energy of a radio transmitter EMI, reducing the amount of EMI that makes the inner loop conductors. When properly installed with shielded connectors with ground equipment, shielding redirects a small amount of electromagnetic energy. These effects of reflection, absorption and redirection of protecting highly effective in reducing the problems of high frequency interference.
Figure 12: Representation of Braid or reflective aluminum with EMI shielding
The best way to protect against EMI from low frequency magnetic fields as a large motor or transformer, is to provide sufficient distance between the cable and the source of the field of interference. Cable shielding has only a limited effect to avoid interference problems of low frequency magnetic fields. Instead of a magnetic field to reduce the reflection or absorption, the cable produces a magnetic field instead of reducing the interference of magnetic field frequency. This is the result of the reduction of the variable magnetic field intensity that reaches the pair of conductors. Figure 13 is a representation of how screening can reduce the strength of this type of interference to reach inner conductors twisted pair.
Figure 13: Cable shield reduces the intensity EMI on cable
The statement
If you have a problem of electromagnetic noise, we recommend using shielded cable. When it comes to higher frequency electromagnetic noise only, like a radio transmitter, a length of shielded cable to provide adequate protection. For effective protection against low frequency electromagnetic fields, such as an electric motor, a braided shield or a combination of paper / woven screen is mandatory. If you are unsure about the type of electromagnetic noise, you should use a combination of aluminum / braid shielded cable, as it provides the best protection against a wide variety of electromagnetic disturbances.