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Nt 1110 Unit 3 Assignment 1

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Unit 3 Assignment 1
Video Clip 1.07
Serial Parallel & Game Ports * Serial ports – 9 or 25 pins (male) * Parallel ports – 25 pins (female) * Game ports – 15 pins (female)
Mouse – serial connector (old), PS/2, or USB/wireless
Keyboard – 5-pin DIN (old), PS/2 or USB/wireless
Network Inteface card – converts parallel communication to serial (RJ-45 connector)
Modem – connects to phone line (56k), converts analog to digital & vice versa (RJ-11 connector).
Video – VGA, DVI, or S-video
SCSI – narrow (50-pin Type A), wide (68-pin, type P)
IEEE 1394 (firewire) – serial, fast, hot swappable, used for streaming media, expected to replace SCSI
Multimedia – Microphone, speakers, earphones, color coded.

Video 1.09
CRT Monitor (old) & LCD Monitor (new)
CRT – Cathode Ray Tube
LCD – Liquid Crystal Display
Contrast Ratio – Ratio of purest white to purest black
Dot pitch – CRT – Distance between phosphorescent dots
Pixel Pitch – LCD – Addressable pixels on screen, same as resolution.
Resolution – Both CRT & LCD – Addressable points on screen.
PCI Express – twice as fast as AGP

Video 1.10
RAID – Redundant Array of Independent Disks
Fault tolerance – real time copies of data, and data is not lost if hard drive fails.
RAID – protect data in real time.
RAID 0 – Striped Volume – faster speeds, no fault tolerance. Requires two or more drives, max 32 drives, CPU writes data evenly among drives, each disk has partial copy.
RAID 1 – Mirrored Volume - Creates two copies, provides fault tolerance. Requires two drives of same size, creates two copies simultaneously.
RAID 5 – Striped with Parity – Uses three or more drives, faster speeds with fault tolerance. Reqwritten uires at least 3 drives, max 32 drives, data written to each drive sequentially, one drive contains parity checking, parity stripe can replace lost data.

In these videos, ports, video monitors, and hard drives were discussed. When dealing with ports, there are numerous port types; however, most modern computers currently use USB for keyboard/mouse and DVI for monitors. The multimedia ports have remained relatively the same. Today’s LCD monitors have replaced the outdated and more dangerous CRT monitors. These earlier monitors were much bulkier, and could cause harmful radiation. The newer LCD monitors have much higher resolutions and detail as well as greater contrast ratios. RAID is something that can be very helpful to protect your data while you are working on it throughout the day. RAID comes in three different varieties that differ slightly, but all protect data in real time.
I found these videos to be very informative. I was interested to learn more of the differences between the CRT and LCD monitors, and did not know that CRT monitors actually could be harmful. Also, learning about RAID was fascinating, as I did not know anything about it. It would be definitely be useful on a work computer where your data would be backed up in case of losing power, or some other incident.

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