Blue tooth
Short range
Eliminates the need for cables between devices
Operates at 2.4 to 2.485 GHz
Low power, low cost and small size
Use adaptive frequency hopping AFH
Vers. 1.2 up to 1.2Mbps
Vers. 2.0 + EDR up to 3 Mbps
vers. 3.0 + HS up to 24Mbps
Infrared
Short range
Operates in the lowest light frequency, usu between 100GHz-1000THz (terahertz)
Has to be aligned with the device so the light signal isn’t blocked
Cellular WAN
Two ranges about 800 MHz and about 1900 MHz
Wi-Fi (Wireless Fidelity)
Connection distance 300 feet
Easy to access for network connectivity
Satellite
Faster than dial-up slower than cable and DSL
Ideal for rural and remote internet users
Faster to download than upload
Weather can screw with the connection.
Laptop servicing
Replacing parts
CRU – Customer replaceable units, parts a customer can replace
FRU – Field replaceable unit, parts only a field technician
Batteries
You may need a new laptop battery if
It shuts off immediately when AC is removed
Battery is leaking
Battery over heats
Battery wont hold a charge
Look for the largest capacity battery when buying
Docking stations
Lets you connect PCI cards, addtional hard drives optical drives and floppy drives
Usually made for each specific laptop so you have to buy the one made for your laptop
Storage devices
External USB hard drive
Firewire hard drive
BD/DVD/CD burner
Additional RAM
SODIMM usually used for laptops
Read manual to check what can be changed before beginning
Preventive maintainence
Clean regularly
Perform hard drive maintainance, disk clean ups and disk defragmenter
Update software
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