My Writings. My Thoughts.
finish chapter 8
// May 18th, 2010 // No Comments » // Uncategorized
The network interface card (NIC) is required to conect to the internet
Every NIC must be configured with the following information:
- Protocols – The same protocol must be implemented between any two computers that communicate on the same network.
- IP address – This address is configurable and must be unique to each device. The IP address can be configured or automatically assigned by DHCP.
- MAC address – Each device has a unique MAC address. The MAC address is assigned by the manufacturer and cannot be changed.
AT Commands
All modems require software to control the communication session. Most modem software uses the Hayes-compatible command set.
Analog Telephone
This type of service uses a modem to place a telephone call to another modem at a remote site, such as an Internet Service provider.
Integrated Services Digital Network (ISDN)
The next advancement in WAN service is ISDN. ISDN is a standard for sending voice, video, and data over normal telephone wires.
Digital Subscriber Line (DSL)
DSL is an “always-on” technology. “Always on” means that there is no need to dial up each time to connect to the Internet.
Asymmetric Digital Subscriber Line (ADSL)
ADSL is currently the most commonly used DSL technology. ADSL has different bandwidth capabilities in each direction.
PLC is known by other names:
- Power Line Networking (PLN)
- Mains Communication
- Power Line Telecoms (PLT)
Satellite
Broadband satellite is an alternative for customers who cannot get cable or DSL connections.
ISDN
ISDN is another example of broadband. ISDN uses multiple channels and can carry different types of services; therefore, it is considered a type of broadband.
DSL
With DSL, the voice and data signals are carried on different frequencies on the copper telephone wires.
Cable
A cable modem connects your computer to the cable company using the same coaxial cable that connects to your cable television.
Preventive fault remedial
// March 24th, 2010 // No Comments » // Uncategorized
| Preventive | Fault | Remedial |
| Monitor Ink levels | No Ink | Replace Ink cartridge |
| Regular servicing of printer | Regular paper jams | Printer engineer-£££ |
| Monitor paper | No paper | Replace paper |
| Check for a jam | No printings | Printer engineer -£££ |
| Check the fuse | No power | Replace the fuse |
| Clean fans | Overheating | Replacement |
| Suitable USB cable | No data connection | Replace USB cable |
scanners
// March 23rd, 2010 // No Comments » // Uncategorized
| Scanner type | Description | Use |
| Handheld | Small yellow, go over more than once to scan a large image | supermarket |
| Drum | Produce’s a high qulity image | home |
| Flatbed | are often used to scan books and photographs, clean glass reguly | home and office |
| All in one | a printer scaner photo copier and/or fax | office/home |
table of interface and speed
// March 23rd, 2010 // No Comments » // Uncategorized
| interface | Speed | Notes |
| Ethernet | 10/100/1000Mbps | network connections |
| USB (1.1, 2.0, 3.0) | (1.1)12Mbps/ (2.0) 480Mbps/ (3.0) 5Gbps | |
| Firewire | 400 Mbps | 1394 |
| Bluetooth (1.1/2.0) | 1.1:721Kbps 2.0:3Mbps | |
| Parallel | 115.2Kbps | |
| Serial | 28.9Kmbps | |
| Wi-Fi (a/b/g/n) 802.11 | a:54Mbps b:11Mbps g:54Mbps n:540Mbps | network connections |
step by step on printers
// March 17th, 2010 // No Comments » // Uncategorized
step 1) first turn both printer and computer on to check if the printer is working.
step 2) then you conect the USB cable (a-b)
2a) A will go into the desktop
2b) B will go into the printer
step 3) go onto the inter and download disk for the lexmark 3350
step 4) install the printer
step 5) do a test page to check it is working nicely
chapter 6
// February 10th, 2010 // No Comments » // Uncategorized
Chapter 6 is about laptops and portable devises the first laptop was very very heavy because the battery was near to the weight of a car battery and the HDD (hard drive) was the size of a desktop HDD als0 the screen was really heavy as well and it got really hot because it only had one fan.
The laptops round today are really light and easy to cary round they have 4-6 fans to cool each component and the battery is really small but powerfull to keep the laptop going for 2-7 days, the screenu is also really light on the laptops today, the HDD (hard drive) is small and light compared to the 1980 laptop weight.
smartphones and other portable devises
The older portable devises where really chuncky also heavy because the battery are smaller than the laptops but are still heavy. the smartphones and portable devises round today are really light and thin, some are tuchscreen and s0me are not, some have poor memory and some dose not
The smartphones
where around is the 1970′s they are hand held devises. The smartphones
and portable devises are 
easly connected to the intetnet to play games and watch videos and more with the internet. the internet is found all around so u are easaley connected to the internet/ wi-fi.
power management + ACPI standards
// February 3rd, 2010 // No Comments » // Uncategorized
S1 the computer is not running however the CPU and RAM are still resiving power
S2 the CPU is off, but RAM is still refreshed. The system is in a lower mode than S1
S3 the CPU is off, and the RAM is set to a low refresh rate. this mode is called “save to RAM” . In windows XP, this state is known as the standby mode.
S4 The CPU and RAM are off. The contents of RAM have been saved to a temporary file on the hard disk. This mode is also called “saved to disk”. In windows XP this state is known as the hibernate mode.
S5 The computer is off and nothing has been saved.
laptop and desktop components.
// February 2nd, 2010 // No Comments » // Uncategorized
A laptop HDD (hard drive) is a lot a smaller than a desktop HDD (hard drive)
A laptop has more fans than a desktop because the desktop has a bigger fan which means it can let more air out and a laptop has got 4-6 fans for different component Continue Reading
