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The easiest method to send test PDUs from a mobile phone is through the use of AT commands The AT commands used by mobile phones are extremely similar to the AT commands that were developed for Hayes dial-up modems They are used by cell phones to programmatically control many functions having to do with the phone s radio In order to send SMS messages through a phone, the following is needed: Serial connection between a computer and phone Terminal program Appropriate AT commands The serial connection to the phone can be established in a number of ways Originally the most common method involved a serial cable between the computer and a specialized connector to the phone The cables were proprietary to each phone Although proprietary cables are not necessary, each phone uses different connection methods The connection options can be specialized cables, USB cables, IR, and Bluetooth With so many different options, it is best to acquire manufacturer data on serial connections or to search online After the serial connection has been physically established via a cable or a wireless connection such as Bluetooth, a terminal program is needed For Windows users, HyperTerminal was the de facto choice However, Microsoft stopped including HyperTerminal with the release of Windows Vista Therefore, this section will conduct the walkthrough using Putty a popular free SSH client that can also do serial connections over COM ports (wwwchiarkgreenendorguk/~sgtatham/putty/downloadhtml) For Linux/Unix users, Minicom is a popular and widely available terminal program that can also be used The terminal program needs to be configured in order to operate with the phone The following are options that work with most phones Sometimes the speed may need to be adjusted COM Port Set this to the COM port for the phone The port will depend on how the phone is connected Speed (Bits Per Second) Valid values include 115200, 57600, 19200, and 9600 The speed value itself won t make anything faster The bottleneck is not communication between the terminal and phone The phone s radio determines SMS throughput.

The telephone network works much like the TCP transport protocol It is connection based, and the connection is maintained until the call is terminated This enables you to hear the other person almost instantaneously Telephone networks use two copper wires in most homes, but the switching medium is mainly ber This allows for the high-speed switching in the back end but slow response in data communications because of the modem device connected to the system

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Warning It is critical to understand that only trained monitor technicians should remove the cover of a video monitor (or a television set, for that matter) The inside of a traditional monitor might look similar to the interior of a PC, with printed circuit boards and related components, but there s a big difference: No PC has voltages up to 50,000 volts or more inside, but most CRT monitors do So be sure to get one thing clear casually opening a monitor and snooping around has the potential to become harmful to you and the monitor and in cases of extreme carelessness, it can even be deadly! Even when the power is disconnected, certain components (capacitors) still retain substantial levels of voltage for an extended period of time Capacitors work like batteries Yes, they can maintain 50,000 volts! If you inadvertently short one of the capacitors, a large discharge will occur into the monitor circuits, destroying them If you re touching the metal frame, you could fry yourself to death Given this risk, certain aspects of monitor repair fall outside the necessary skill set for a standard PC support person, and de nitely outside the CompTIA A+ exam domains Make sure you understand the problems you can x safely and the ones you need to hand over to a quali ed electronics repair shop

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Your of ce staff s computers need a serious video upgrade Some of the PCs have tiny 15-inch LCD monitors that simply have to go, while others have decent 17-inch and 19-inch LCDs that have a year or two of life left in them Your boss has bought new PCIe video cards and some widescreen LCD monitors You re tasked with installing the cards, loading drivers, and setting everything up in Windows

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