PCS (Personal Communications Service) is a set of standards. Most PCS standards are based on an existing standard. PCS is little more than the operation of these standards on the frequency bands of 1930-1990MHz for receiving and 1850-1910Mhz for transmitting. PCS StandardBase Standard PCS TDMA IS-136 PCS CDMA IS-95 PCS 1900 GSM PACS PHS cordless DCT-U DECT cordless Composite CDMA/TDMA n/a PCS Network Operators Sprint PCS operates a PCS network in the United States. Additional Reading on PCS For more information on PCS, read Personal Communications Service (PCS) by the Read More

The siemens is the standard unit of electrical conductance. It is the inverse of resistance and is equal to one divided by resistance, or current divided by voltage. One siemens is equal to one ampere per volt. History of the Siemens The siemens was defined at an international conference in 1881, and is named after Ernst Werner von Siemens (1816-1892), a German inventor. The symbol for Siemens is a capital S. The previous unit for electrical conductance was called the mho, and it is still used today in some areas Read More

For those looking to get the very best performance out of their video gear, the standard of DVI (Digital Visual Interface) is highly regarded in the industry. DVI is a connection standard developed by the Digital Display Working Group consortium (DDWG) that is designed to deliver the highest quality video signals to high definition TV’s, digital monitors and DLP projectors by sending video signals uncompressed without any degradation. DVI on Fiber is the method of sending high quality, uncompressed signals through fiber optic cables (usually for moderate to long distances). Read More

A laser skin treatment is a relatively new technology that surgeons have only recently begun using. It is when the surgeons utilize lasers (containing carbon dioxide) to vaporize the skin’s upper layers, consequently allowing a new layer of skin to form. The technique is commonly used to fine tune wrinkles and various face lines, especially around the eyes and the mouth. What is great about the laser skin treatment is that it can be used at any part of the body, including damaged areas, as the laser beam is extremely Read More

Unix has many dedicated fans who have written quite a few excellent Unix tutorials for beginning users. Here are a few of the better Unix tutorials: Unix Tutorial for Beginners Unix: The Bare Minimum Introduction to Unix commands Unix Tutorial UNIXhelp for Users Unix Tutorial and Command Reference Unix Tutorial

Understanding SMTP Connections and Commands The process that occurs to establish a connection between a SMTP client and SMTP server is illustrated below: The SMTP client initiates a TCP connection to SMTP server. The SMTP server replies with a ready response – 220 response. The SMTP client sends a helo command to indicate that a SMTP session is to be started. The server returns a response 250. This signifies that the request has been completed. The SMTP client uses the mail from: command to identify the sender of the message. Read More

Skype is an instant messaging software that allows users to communicate with each other via instant messaging, text messaging, and audio and video calls. It differs from other instant messaging software as it provides users with personalization features such as emoticons, personal profiles, and signatures, as well as group communication methods such as conference calling. Skype also records users’ messages and audio calls for later review and allows users to make calls to both local and international land-line and mobile phones at extremely low rates.   What is Bandwidth? Bandwidth Read More

A botnet or robot network is a group of computers running a computer application that only the owner or software source controls and manipulates. The botnet may refer to a legitimate network of several computers that share program processing amongst them. Usually though, when people talk about botnets, they are talking about a group of computers infected with a malicious kind of robot software, the bots, which present a security threat to the computer owner. Once the robot software (also known as malicious software or malware) has been successfully installed Read More

Horizontal drilling is when the direction of the well is different than that of when it was initially drilled. While it does not have to be at 90 degrees to the initial hole dug, the horizontal drill bores parallel to the surface of the Earth. In recent years, it has been suggested that horizontal drilling is the best form of drilling because it saves money as well as the foot print on the world while trying to attain oil. Unlike a vertical drill where they drill directly over the oil Read More

Contacting Facebook can be a difficult ordeal, which most Facebook issues’ highly personal nature exacerbates. A blocked account or lost password puts a complete block on one’s ability to interact with friends and family via Facebook, while a stolen or hacked account can be even more personally disruptive. Whether the user’s Facebook account has been taken over, there are technical difficulties, or the user just wants to consult a real person about Facebook’s features and policies, the list below provides a place to start. Facebook’s Online Help Section The first Read More