RJ 45

RJ 45 or LAN Cable is a connector for computer network (Ethernet) cables.

Straight Cable


It used in the context of Local Area Networks a straight through cable is a network cable used to connect a computer to a network hub or router. It cannot be used to connect a two computers directly. It usually use straight cable to connect different type of devices. This type of cable will be used most of the time and can be used to:

1. Connect a computer to a switch/hub's normal port.
2. Connect a computer to a cable/DSL modem's LAN port.
3. Connect a router's WAN port to cable/DSL modem's LAN port.
4. Connect a router's LAN port to a switch/hub's uplink port.
5. Connect 2 switches/hubs with one of the switch/hub using an uplink port and the other one using normal port.

Crossover Cable

Is a type of twisted pair copper wire cable for LAN's in which the wires on the cable are crossed over so that the receive signal pins on the RJ-45 connector on one end are connected to the transmit signal pins on the RJ-45 connector on the other end. Sometimes it will use crossover cable and used to connect same type of devices. A crossover cable can be used to:

1. Connect 2 computers directly.
2. Connect a router's LAN port to switch/hub's normal port.
3. Connect 2 switches/hubs by using normal port in both switches/hubs.

Real Life Working Technology

Television also known as TV is a telecommunication medium for transmitting and receiving moving images that can be monochrome or coloured, with or without accompanying sound. 

History.

In the early stage, television employed a combination of optical, mechanical and electronic technologies to capture, transmit and display a visual image. The first images transmitted electrically were sent by early mechanical fax machines.

1878 - The concept of electrically powered transmission of television images in motion was first sketched.

1881 - Idea of using scanning to transmit images was put practical use.

1884 - Paul Gottlieb Nipkow, patented the first electromechanical television system which employed a scanning disk.

1907 - Russian scientist Boris Rosing became the first inventor to use a CRT in the receiver of an experimental television system.

1926 - Hungarian engineer Kalman Tihanyi designed a television system utilizing fully electronic scanning and display elements.

1927 - Herbet E. Ives of Bell Labs transmitted moving images from 50-aperature disk producing 16 frames per minute over a cable from Washington,DC to New York City and via radio from Whippany,New Jersey.

1927 - Philo Farnsworth made the world's first working television system with electronic scanning of both the pickup and display devices.

1936 - Olympic Game in Berlin were carried by cable to television stations for the public watch the game.

Late 1936 - BBC began transmitting the world' first public regular HD service.

1936 - Kalman Tihanyi described the principle of plasma display, the first flat panel display system.

HOW TV WORKS?

TYPES OF TV:

• Cathode Ray Tube (CRT).
• Rear Projection.
• Front Projection.
• Plasma
• Liquid Crystal Display (LCD).

ADVANTAGES:

• It enables people to share cultural experiences with others.
• Shared viewing gives family members of all ages an opportunity to spend time together.
• To gain more knowledge by knowing other country culture, language, places and etc.
• Viewer has a variety to choose from.

DISADVANTAGES:

• Less Exercise.
• Don't want to talk and communicate with other.
• Some variety shows bad effect with bad to young people.
• Learn unnecessary things.
• Can damage to eyesight if watch constantly.
• Expensive every 6 months because technology are upgrading in every seconds.

World Without Technology

There are many will be happen if in this world doesn't have technology:

1. Disease would infect most of the population.
2. We may get sick easily due to not proper food and drink.
3. We would be able to predict major disaster will happen in the future.
4. Our life being be so boring because entertainment are not update.
5. Can't communicate with other people.
6. Lack of news from around the world.
7. Lack of knowledge knowing around the world.
8. Crime rate will increase due to being unable to gather enough information.
9. Difficulties in education.
10. Lack of standard of livings.
11. 
    

Software for Preventive Maintenance

1. Disk Defragmenter.

It consolidates fragmented files on our computer's hard disk to improve system performance. Fragmentation makes our hard disk do extra work that can slow down our computer. Removable storage devices such as USB flash drives also can be fragmented. Disk Defragmenter rearranges fragmented data so that our disk and drives can work more efficiently. It runs on schedule and it can me analyze and defragment our disks and drives manually. These are the followings how to use this software:

1. Start Windows and type 'Disk Defragmenter'
2.  To determine if the disk needs to be defragmented or not, click Analyze disk. Once it finished analyzing then it can be defrag.
3. Click Defragment Disk.

2. Advanced SystemCare.

A computer tool for Windows 7, Windows XP, Windows Vista and Windows 2000 created by IObit. It is used to improve computer performance and speed. It has free version and PRO version. The functions of this are to clean up computer registries, do a smart defragment, scan for malware and cleanup broken shortcuts. The following steps of using this software are:

1. Click Advanced SystemCare, then on the menu on the "Deep Care".
2. Click Scan Now until it finish scan.

Preventive Maintenance

Preventive Maintenance is a procedure of inspecting, testing and reconditioning a system at regular intervals according to specific instructions, instead to prevent failures in service or to retard deterioration. It is also to prevent the failure of equipment before it occurs. These activities can include regular inspection along with solving any discovered problems and regularly-scheduled parts changes.


There are many examples of Preventive Maintenance, the most commons ones are Defrag hard drive, Vacuum inside of case, Run a virus scan of the memory and hard disk, Create a backup if you have updated an important data or program files, Check chips for chip lift and reseat if necessary and many more.

The function of Preventive Maintenance is to designed to prevent the need for corrective maintenance, more commonly called repair work. Corrective maintenance tends to be more time-consuming and expensive.


They are many benefits of Preventive Maintenance:

• To increases the efficiency and speed of our equipment.
• Help to save budget from being repair and replacement.
• Saves time since when we spending too much on machine breakdown when we need our machine the most and then spend time to get back in shape.
• Can be reduce the cost when we work done is faster and machine doesn't break down in the middle of the work schedule.
• Helps to avoid the replacing of the parts of the equipment before the scheduled time.

The Procedures of Preventive Maintenance:

• Hard Drive Maintenance - It because that inside it are most important devices to maintain on computer and it contains an operating system and long-term storage space for data where all programs are inside like music, videos, documents and other files that been stored in hard drive.
• Internet Security - Is to preventing and getting rid of viruses and other malware on the internet. And must be run a fully updated antivirus program when using Internet atleast perform once a week.
• Case Cleaning - To keep out from dust inside the computer which can cause computer more hotter when it runs which may cause computer crashes and hardware failure.

Assemble and Dissemble HP

Last week, our instructor give us a PC and computer tools. Then after that at the same time we're given straight away a task where we have to assemble and dissemble the PC that been given to us using the tools. This task were given in a group work of 4 or 5 people. So here are steps of assembling and dissembling of a PC where I will explain how, show some picture and videos or either of it.

Firstly before do this, here are the things that you should do first:

1. To be make sure you in dry condition.
2. Wear safety equipment's like gloves, safety goggles and etc.
3. Do in a brighter place.
4. Make sure unplug any cable from the PC.
5. Make sure do in big room so that it easy to put computer's stuff

The first step is to unscrew all the screws from the case of the computer.

Next is to removing and placing back CD/DVD-RW ROM.

Next is the most easiest thing but be careful, once broken consider as broken even though it is small thing and make sure after placing it, it must be clip back both on the right and left side, RAM (Random Access Memory).

Next is removing and placing back floppy disk.

Then remove and place back hard disk of the computer.

Unscrew and screw fan of the computer, above are top view and below are the other side of the fan.

Next is removing and placing USB port.

And now the cable from hard disk to motherboard is remove and place it back.

Then now removing and placing the CMOS battery.

Next is the "Antenna F1"

Next is the speaker of the computer, unscrew to remove and screw to place it back.

Wireless Adapter comes after speaker.

Next is a power supply where we don't have to remove it.

After all been remove, this is how it look likes the part and the are place into specific place.

Lastly is to show how to close the case of CPU.

Safety Tips When Doing Computer Repairs

Keep these important tips in mind as you work inside your computer:

1. Check Your PC’s Basic Specifications and System Requirements. 
2. Ensure That You Cut-off any Power Connections. 
3. Watch for sharp edges. 
4. Remove Hand Jewelry.
5. Use Safety Equipment e.g Coverall, Goggles, Safety Boots, Helmet, Glove.
6. Do not touch any exposed wires or sockets.
7. Beware of sharp edges.
8. Pay attention to the boundaries on computer.