A MagicJack is a VoIP (Voice over Internet Protocol) device that allows users to connect their home telephones to their computer in order to make free calls. A number of influential magazines such as the L.A. Times, CNBC, PC Magazine, and the New York Times strongly recommend MagicJack. It is, by far, the cheapest option for home telephone service in the U.S. While the Magic Jack requires an initial investment, there are never any monthly bills or call fees. How MagicJack Works A MagicJack has a USB attachment on one Read More

Intersymbol interference is a signal distortion in telecommunication. One or more symbols can interfere with other symbols causing noise or a less reliable signal. The main causes of intersymbol interference are multipath propagation or non-linear frequency in channels. This has the effect of a blur or mixture of symbols, which can reduce signal clarity. If intersymbol interference occurs within a system, the receiver output becomes erroneous at the decision device. This is an unfavorable result that should be reduced to the most minimal amount possible. Error rates from intersymbol interference Read More

RFC 2829 – Authentication Methods for LDAP defines the basic threats to an LDAP directory service: Unauthorized access to data via data-fetching operations, Unauthorized access to reusable client authentication information by monitoring others' access, Unauthorized access to data by monitoring others' access, Unauthorized modification of data, Unauthorized modification of configuration, Unauthorized or excessive use of resources (denial of service), and Spoofing of directory: Tricking a client into believing that information came from the directory when in fact it did not, either by modifying data in transit or misdirecting the client's Read More

Wireless networks are great, when they work. A weak wireless signal can mean real trouble. One of the best ways to improve a wireless signal is to replace the antenna on one or both ends of the connection with a better wireless antenna. Types of Wireless Antennae Wireless antennae fall into five general categories: Omni Parabolic or Dish Yagi Patch Sector Omnidirectional Antenna An omnidirectional antenna works equally well in picking up signals from every direction. Omni's make excellent general purpose and mobile antenna's. The longer an omnidirectional antenna is, Read More

What is WiBro?  WiBro stands for “Wireless Broadband”. It was developed in South Korea, to allow people to access the Internet from anywhere in the country. On top of that, even if you are in a moving vehicle, you can still access the Internet because the WiBro continues to transmit the signal regardless of whether you are moving or sitting still. Currently, WiBro is covering nearly 85 percent of the country. Similar to the WiMax–an American attempt to create wireless broadband in cities–the WiBro uses the IEEE 802.16 standards. The Read More

A cable tie, also commonly called a zip tie, is a length of strong Nylon lined with a gear rack. On one end of the tie is a small square case through which you can feed the other end of the tie. The teeth on the tie are arranged in a saw-tooth pattern, and the case contains a ratchet which locks against the teeth, preventing the tie from being pulled back. The simplest way to remove the cable tie is to cut the plastic and discard it afterward. It is Read More

An IP (or Internet Protocol) address conflict occurs when two different systems on the same subnet are assigned or otherwise have their network interface configured to use the same IP address. It is possible to have two systems on different subnets configured with the same IP address, but not have a conflict occur due to routing limitations or because of the effects of NAT or Network Address Translation. Systems with the same IP Address on the same subnet need not have the same netmask or broadcast address for the conflict Read More

When an error message saying, “Network cable is unplugged” is displayed, it generally means that the computer can detect that there is an ASDL and/or Cable Connection pre-configured on the computer, but an Ethernet cable and/or a cable that is supposed to be plugged into the modem is unplugged. In the case that all of the cables are plugged in correctly but the error message is still displayed, there are three possible problems. Kinked Cable One of the cables may have a kink. The old cable will have to be Read More

When setting up your router,  the most important thing you need to do is access the router. You do this because you need to set up the security features and type of Internet connection. Therefore, getting into the router is very important. Accessing the router is like accessing any other website. First, you need to know the router’s default IP address. For example, it might be: 192.168.0.1, 192.168.1.1, etc. If you don’t know what your router’s local IP address is, read the manual and find it there. You can also Read More

Multicast is the transfer of messages to multiple destinations simultaneously, using fewer networks. The information is delivered to each of the links only once, and copies are created when the links to the destinations split, thus creating an optimal distribution path. Multicasting reduces unnecessary packet duplication. A wireless network utilizes radio communication, unlike wired networks, which employ electrical conductors. Wireless multicasting can therefore be loosely defined as the process of multicasting over wireless networks. Multicast over wireless networks is a fundamental communication function as well as a challenging goal. The Read More