Dial-up Internet access is a type of Internet connectivity that operates through a standard telephone line. By running the telephone line to a modem device in the personal computer, and configuring the computer to dial a specific phone number, the computer is granted Internet access.
the quality of the connection is not always good and data rates are limited.the maximum data rate with dial-up access is 56 Kbps (56,000 bits per second)
Saturday, November 28, 2009
what is home network
A home network is simply a method of allowing computers to communicate with one another. If you have two or more computers in your home, a network can let them share:
* Files and documents
* An Internet connection
* Printers, print servers and scanners
* Stereos, TVs and game systems
* CD burners
* Files and documents
* An Internet connection
* Printers, print servers and scanners
* Stereos, TVs and game systems
* CD burners
Wednesday, November 25, 2009
Notebook Battery
F.A.Q |
Some Battery Terms, See the Battery Glossary
Battery Glossary
For Notebook and Laptop UsersTo get maximum performance from the battery, fully optimize the notebooks power management features prior to use. Power management is a trade off: better power conservation in exchange for lesser computer performance. The power management system conserves battery power by setting the processor to run at a slower speed, dimming the screen, spinning down the hard drive when it's not in use and causing the machine to go into sleep mode when inactive. The notebook users guide will provide information relating to specific power management features. We will be happy to try and answer your lead-acid battery and charging questions. Over 80% of the questions I receive are already answered in the information posted on this Web site, so please check first.please einclose a "reply to" e-mail address in your message. For comments, criticisms, suggestions or questions, please E-mail us. Many thanks! Disclaimer http://www.abatterypack.com/notebook-battery-FAQ.htm |
Backup data
Why should you back up?
Data loss can happen in many ways. One of the most common causes is physical failure of the media the data is stored on. You probably have everything saved on your PCs hard drive .That hard drive will not live forever .
normally hard drives will live for years without incident But eventually they will die. It might happen gradually by more and more bad clusters accumulating until most of the drive is unusable Or it might happen suddenly, the hard drive just dies without warning.
Another possible cause for data loss is power failure. It can result in loss of the document you are currently working on because you did not save it before the power failed and your PC shut down
Also worth mentioning is data loss through virus attacks. There are plenty of nasty computer viruses out there that will delete files on an infected machine. That's why Virus Protection is just as important.
There are many ways to backup data on your computer - the least effective of which (for obvious reasons) is having the only backup location on your actual hard drive. Instead, use external hardware such as a disk, CD, zip drive, or memory stick.
In general, the safest choice is to back up your critical data to an external media . Some popular options are External Hard Drive, CDs, USB Flash drives The option you use will depend on the amount of data you want to back up.
ex:Backup data by connect en External hard drive to your computer using a USB port.
Data loss can happen in many ways. One of the most common causes is physical failure of the media the data is stored on. You probably have everything saved on your PCs hard drive .That hard drive will not live forever .
normally hard drives will live for years without incident But eventually they will die. It might happen gradually by more and more bad clusters accumulating until most of the drive is unusable Or it might happen suddenly, the hard drive just dies without warning.
Another possible cause for data loss is power failure. It can result in loss of the document you are currently working on because you did not save it before the power failed and your PC shut down
Also worth mentioning is data loss through virus attacks. There are plenty of nasty computer viruses out there that will delete files on an infected machine. That's why Virus Protection is just as important.
There are many ways to backup data on your computer - the least effective of which (for obvious reasons) is having the only backup location on your actual hard drive. Instead, use external hardware such as a disk, CD, zip drive, or memory stick.
In general, the safest choice is to back up your critical data to an external media . Some popular options are External Hard Drive, CDs, USB Flash drives The option you use will depend on the amount of data you want to back up.
ex:Backup data by connect en External hard drive to your computer using a USB port.
network diagram explain
this diagram illustrate use of a wifi wireless network and router as the central device of a home network see the figure for detailed and description of this layout
as you see the broadband modem connecting to dsl line and wireless router. all device such as Firewall. Mail server , PC, notebook are connecting to a wireless router .a wireless router possess a working network adapter , enables sharing of a high-speed Internet connection.
Wireless routers technically allow dozens of computers to connect over WiFi links
wireless routers also working on Ethernet hubs and switches allow multiple wired computers to network with each other.
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as you see the broadband modem connecting to dsl line and wireless router. all device such as Firewall. Mail server , PC, notebook are connecting to a wireless router .a wireless router possess a working network adapter , enables sharing of a high-speed Internet connection.
Wireless routers technically allow dozens of computers to connect over WiFi links
wireless routers also working on Ethernet hubs and switches allow multiple wired computers to network with each other.
recommend ram
there are many different amounts and types of ram . if its just something for the internet, word processing and drawing software then 1GB is fine. but it would better if you have 2GB when you are running many application , mutil tasking the system will not slow because you have sufficient of ram . so i recommend you have at least 2GB of ram
Tuesday, November 24, 2009
Reasons to Choose Mobile Broadband
5 Reasons to Choose Mobile Broadband
More and more people are swapping for their routers for dongles, but why? In this article we will give you 5 reasons why mobile broadband is becoming increasingly popular.
- Great for people on the move. Mobile broadband technology allows users to browse the internet from anywhere with a mobile signal. You can use your dongle at work, holidays, when travelling. For example, I recently used my dongle on a train around London, and although the connection was poor at some stations it was great having the flexibility of working and checking emails whilst travelling.
- Great way to supplement your existing fixed line connections as mobile broadband doesn't restrict your physical location. On the rare occasion my home broadband goes down it's great having a back-up.
- Broadband dongles are great for students at university, who tend to move around different rental accommodation.
- Dongles remove the hassle of having to cancel and re-register with an internet service provider.
- Pay as you go (PAYG) option - say good bye to fixed monthly contracts. Like with PAYG mobile phone deals you only pay for what you use, so ideal for people who don't want to be tied down to a long-term contract. A pay as you go broadband dongle also makes a great gift for a loved one.
Internet dongles are currently not suitable for streaming videos like iPlayer or downloading large media files as connection speeds are not parable with home broadband connections.
Internet dongles are a relatively new technology (introduced in 2007), and as a result mobile broadband is slower than home broadband. Seeds are likely to become faster as the UK's mobile infrastructure grows and develops.
Before choosing a broadband package, ask yourself, what type of internet user are you? If you regularly watch video online or share media files on peer to peer networks you're probably best going down the internet service provider (ISP) route and choosing home broadband. If you mainly use the internet for e-mails, shopping and on constantly on the go then mobile would suit you.
Will Hall is a internet entrepreneur and mobile broadband blogger. To learn more, please visit Broadband Dongle.
Article Source: http://EzineArticles.com/?expert=William_W_Hall
Saturday, November 21, 2009
Hard Drives ( hard disk )
Hard Drives ( hard disk )
A Hard Drive (sometimes called a hard disk) is a mass-storage device that is typically connected through your computer's IDE or serial interface SATA (Serial ATA) for internal drives, and through IEEE 1394, or USB for external drives (SCSI is an expensive option for either internal or external drives)
figure 1 internal hard drive
figure 2 External hard drive
Defination of CPU?
Central Processing Unit (CPU)
The CPU is the brains of the computer. Sometimes referred to simply as the processor or central processor, the CPU is where most calculations take place. In terms of computing power, the CPU is the most important element of a computer system. There are currently two manufacturers that own the majority of the market, Intel (Pentium & Celeron) and AMD (Athlon & Duron)
Recommand CPU
intel® Core™ i7 Processor
2.66 GHz core speed
8 MB of Intel® Smart Cache
3 Channels of DDR3 1066 MHz memory
Nowadays the software and games are requested high performance computer such as ram hard disk and also CPU .CPU is the most important for computer. intel corei7 is the high performance CPU for everything you do.
Defination of RAM?
1 Defination of RAM?
What is RAM?
What is RAM?
RAM (random access memory) is a memory chip that the processor can read from and write to. RAM is volatile memory, meaning that is contents are lost when the computer’s power is turend off
basically there are two types of ram.
that is
i)dynamic ram
ii)static ram
static ram is ram that we are using in our daily life
i.e in our computer..
which stores the data or executes the program only when power on.
when you switch off your pc at that time all the data will be lost.
while in dynamic ram data will be saved even after the power goes off.
so dynamic ram is very useful.
Ex:
DDR2 RAM 4GB
Reason
Because i want to upgrade to window7 and Faster processing speed,
There is only one reason to upgrade
ວ່າແນວໃດທີ່ຮັກ
Wednesday, November 18, 2009
Bandwidth Speeds: BUS
| Serial Port | 115 Kbps |
| arallel Port | 400 Kbps |
| Fast SCSI-2 | 80 Mbps |
| USB 1.0 | 1.5/12 Mbps |
| SCSI-1 | 40 Mbps |
| Ethernet | 10/100 Mbps |
| Firewire (IEEE 1394) | 100/200/400/800 Mbps |
| USB 2.0 | 480 Mbps |
| Gigabyte Ethernet | 1000 Mbps (125 MB/s) |
| ATA 133 | 1056 Mbps (132 MB/s) |
| PCI | 1056 Mbps (132 MB/s) |
| Serial ATA | 1200 Mbps (150 MB/s) |
| 1X AGP | 2112 Mbps (264 MB/s) |
| Fast & Wide SCSI-2 (DT) | 2560 Mbps (320 MB/s) |
| 4X AGP | 8448 Mbps (1056 MB/s) |
| 8X AGP | 16896 Mbps (2112 MB/s) |
| PCI Express x16 | 32000 Mbps (4000 MB/s) |
Bandwidth Speeds: LAN/WAN
Bandwidth Speeds: LAN/WAN
| 28K Modem | 28 Kbps |
| 56K Modem | 56 Kbps |
| ISDN 1B (64K) | 64 Kbps |
| ISDN 2B (128k) | 128 Kbps |
| Cable Modem | 300 K - 3 Mbps |
| DSL | 128 K - 7.1 Mbps |
| Frac. T1 (384K) | 384 Kbps |
| T1 | 1.5 Mbps |
| 10BaseT | 10 Mbps |
| T3 | 44.7 Mbps |
| 100BaseT | 100 Mbps |
Tuesday, November 17, 2009
Broadband Internet
Broadband Internet ແມ່ນຫຍັງ
Broadband ແມ່ນຄຳສັບສະເພາະທີ່ຖືກເອີ້ນຂຶ້ນໃນການຕິດຕໍ່ທາງອິນເຕີເນັດຄວາມໄວສູງ ຜ່ານສາຍເຄເບີ້ນ ແລະ ສາຍຊະນິດທີ່ເຮົາໄດ້ຍິນຄຸ້ນຫູວ່າ DSL ຫຍໍ້ມາຈາກ Digital Subscriber line ໂດຍມີຄ່າ Bandwidth ທີ່ບອກເຖິງຄວາມໄວໃນການສົ່ງຂໍ້ມູນ ເຊັ່ນການຕິດຕໍ່ຜ່ານໂມເດັມດ້ວຍລະບົບ dial-up ຈະມີຄ່າ bandwidth ຢູ່ 56kbps 56ກິໂລບິດຕໍ່ວິນາທີ ແຕ່ການເຊື່ອມຕໍ່ລະບົບ Broadband ນີ້ຈະມີຄ່າ Bandwidth ເລີ່ມຕົ້ນຈາກ 64kpbs ຂຶ້ນໄປ ຈົນຮອດ 2-3-4-5mbps
DSL 128 K - 7.1 Mbps
ສະນັ້ນຈິ່ງເວົ້າວ່າ Broadband ແມ່ນເທັກໂນໂລຍີການສົ່ງຂໍ້ມູນດ້ວຍຄວາມໄວສູງ ຜ່ານເຄືອຂ່າຍອິນເຕີເນັດແບບໃຊ້ສາຍ ສາມາອັບແລະດາວໂຫລດເບິ່ງໜັງຟັງເພງໄດ້ສະບາຍ
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โลกของอินเตอร์เน็ต(Internet) ในปัจจุบันมีการพัฒนาความเร็วในการรับ-ส่งข้อมูลอย่างรวดเร็วเพื่อตอบสนองใน เรื่องของการดาว์โหลดข้อมูลภาพและเสียง หรือโปรแกรมที่ทดลองให้บริการต่างๆ จนมีคำศัพท์ใหม่เกิดขึ้นคือ บรอดแบน(Broadband)
ที่มา
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Narrowband vs. Broadband
Narrowband is usually referred to dial up internet connection and it usually varies from speeds of about 50 characters per second to about 60 Kbps. Broadband is usually regarded as any internet connection that can deliver speeds faster than 60 kbps.
Types of Broadband internet Connections
There are a few types of broadband connections available, some are faster than others and some are more expensive than others to use. Depending on your needs, budget and availability will usually determine which type of broadband internet connection is right for you. They are:
ADSL (Asymmetric Digital Subscriber Line)
ADSL is a popular broadband media for both commercial and residential internet users in America. For the most part, anyone with a normal telephone line will usually have the ability to purchase ADSL from their telephone provider. ADSL works via normal phone lines and you can usually talk with your normal phone as you surf the internet. Speeds of ADSL vary, but are usually in the range of 128Kbps to over 5 Mbps when downloading data. Uploading is much slower, usually about 56K to 1 or 2 Mbps depending on the configuration. A normal dial up modem usually is only 56Kbps, so the fastest ADSL broadband connections deliver speeds that can be up to 89 times faster or more. It is also important to note that ADSL is usually marketed as DSL to make the name of the product sound less confusing. ADSL usually costs from about $30 to $60 per month.
SDSL Symmetric Digital Subscriber Line
One of the problems with ADSL is that the download speeds are much quicker than the upload speeds (usually by 100% or more). For consumers or businesses that upload lots of data this can create problems. SDSL is very similar to DSL service, in that it is provided by your telephone company over preexisting telephone lines, however, SDSL has uploads speeds that are the same as download speeds. Meaning if you have 1Mbps download, you will also have 1Mbps upload speeds. It is important to note that SDSL requires an additional phone line for this service to work properly. However, for most businesses, it is well worth the expense. SDSL can be more costly than ADSL and can cost from about $60 to $100 per month or more for residential customers.
Cable
If you have cable TV, you already know that TV signals are piped in through the cable running from the cable company into your home. Your internet broadband connection runs via these preexisting cables. Cable broadband is a very popular product in America and in some markets much more popular than ADSL. Speeds of Cable broadband vary, but are usually from 2 Mbps to over 8 Mbps. Download speeds are much faster than upload speeds and the cost is very similar to ADSL.
Wireless
Just like wireless telephones transmit data from one phone to another, so can wireless broadband. While it is not as popular due to the availability and newness of the technology, it is becoming more widespread. Usually all that is required is to connect your wireless phone to your laptop computer, essentially making your mobile phone a wireless modem. Speeds vary, but you can usually find speeds from 128 Kbps to about 2 Mbps for downloading data. Expect this technology to boom in the coming years and for speeds to increase as well. Prices also vary, but range from about $60 to about $200.
http://www.tech-faq.com/broadband.shtml
Broadband ແມ່ນຄຳສັບສະເພາະທີ່ຖືກເອີ້ນຂຶ້ນໃນການຕິດຕໍ່ທາງອິນເຕີເນັດຄວາມໄວສູງ ຜ່ານສາຍເຄເບີ້ນ ແລະ ສາຍຊະນິດທີ່ເຮົາໄດ້ຍິນຄຸ້ນຫູວ່າ DSL ຫຍໍ້ມາຈາກ Digital Subscriber line ໂດຍມີຄ່າ Bandwidth ທີ່ບອກເຖິງຄວາມໄວໃນການສົ່ງຂໍ້ມູນ ເຊັ່ນການຕິດຕໍ່ຜ່ານໂມເດັມດ້ວຍລະບົບ dial-up ຈະມີຄ່າ bandwidth ຢູ່ 56kbps 56ກິໂລບິດຕໍ່ວິນາທີ ແຕ່ການເຊື່ອມຕໍ່ລະບົບ Broadband ນີ້ຈະມີຄ່າ Bandwidth ເລີ່ມຕົ້ນຈາກ 64kpbs ຂຶ້ນໄປ ຈົນຮອດ 2-3-4-5mbps
DSL 128 K - 7.1 Mbps
ສະນັ້ນຈິ່ງເວົ້າວ່າ Broadband ແມ່ນເທັກໂນໂລຍີການສົ່ງຂໍ້ມູນດ້ວຍຄວາມໄວສູງ ຜ່ານເຄືອຂ່າຍອິນເຕີເນັດແບບໃຊ້ສາຍ ສາມາອັບແລະດາວໂຫລດເບິ່ງໜັງຟັງເພງໄດ້ສະບາຍ
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โลกของอินเตอร์เน็ต(Internet) ในปัจจุบันมีการพัฒนาความเร็วในการรับ-ส่งข้อมูลอย่างรวดเร็วเพื่อตอบสนองใน เรื่องของการดาว์โหลดข้อมูลภาพและเสียง หรือโปรแกรมที่ทดลองให้บริการต่างๆ จนมีคำศัพท์ใหม่เกิดขึ้นคือ บรอดแบน(Broadband)
"Broadband" เป็นคำศัพท์เฉพาะที่ใช้ในการกล่าวถึงการติดต่ออินเตอร์เน็ตความเร็วสูงผ่าน ทางเคเบิลโมเด็มและสายชนิด Digital Subscriber Line (DSL) ซึ่งนิยมเรียกว่าการติดต่ออินเทอร์เน็ตแบบ broadband โดยมีค่า "Bandwidth" จะเป็นค่าที่อธิบายถึงความเร็วสัมพัทธ์ในการติดต่อกับเครือข่าย เช่น การติดต่อผ่านโมเด็มโดยการ dial-up ที่ใช้งานทั่วไปในปัจจุบันทำงานมีค่า bandwidth 56 กิโลบิตต่อวินาที (kbps (103)) ไม่มีการกำหนดค่าที่แน่นอนไว้ว่า แต่การติดต่อแบบ broadband จะต้องมีค่า bandwidth ประมาณ 1 เมกกะบิตต่อวินาที (Mbps (106)) ขึ้นไป
'Broadband' คือ เทคโนโลยีการส่งข้อมูลความเร็วสูง ผ่านเครือข่ายอินเตอร์เน็ต ด้วยเทคโนโลยีบรอดแบนด์ จะทำให้การท่องโลกอินเตอร์เน็ต มีชีวิตชีวาเพิ่มมากขึ้น ด้วยประสิทธิภาพในการรับข้อมูลขนาดใหญ่ จึงทำให้ฝันของนักท่องอินเตอร์เน็ตเป็นจริง ไม่ว่าจะเป็นการดาวน์โหลดไฟล์ข้อมูลขนาดใหญ่ รูปภาพที่มีความละเอียดสูง เล่นเกมส์ออนไลซ์ หรือแม้กระทั่งการดูหนังฟังเพลงผ่านเครือข่ายอินเตอร์เน็ต
ครับและที่ผมได้กล่าวมาก็คือความหมายของ Broadband ที่มีความเร็วสูงประมาณ 1Mb ต่อวินาทีครับผม
ที่มา
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Broadband Internet access, often shortened to just broadband, is a high data rate Internet access—typically contrasted with dial-up access using a 56k modem.
Dial-up modems are limited to a bitrate of less than 56 kbit/s (kilobits per second) and require the full use of a telephone line—whereas broadband technologies supply more than double this rate and generally without disrupting telephone use.
Although various minimum bandwidths have been used in definitions of broadband, ranging up from 64 kbit/s up to 2.0 Mbit/s[1], the 2006 OECD report[2] is typical by defining broadband as having download data transfer rates equal to or faster than 256 kbit/s, while the United States (US) Federal Communications Commission (FCC) as of 2009, defines "Basic Broadband" as data transmission speeds exceeding 768 kilobits per second (Kbps), or 768,000 bits per second, in at least one direction: downstream (from the Internet to the user’s computer) or upstream (from the user’s computer to the Internet).[3] The trend is to raise the threshold of the broadband definition as the marketplace rolls out faster services.[4]
Data rates are defined in terms of maximum download because several common consumer broadband technologies such as ADSL are "asymmetric"—supporting much slower maximum upload data rate than download.
"Broadband penetration" is now treated as a key economic indicator.[2][5]
Source
http://en.wikipedia.org/wiki/Broadband_Internet_access
===================================================================
What is Broadband?
Broadband is a term that is used consistently with different types of internet connections. Broadband in telecommunications means a wide range of frequencies that are available to transmit information. This ultimately means that the wider the range of frequencies available, the high the amount of information that can be sent at one given time. For an easy way to picture a broadband internet connection compared to a narrowband internet connection, think of a highway. With a one lane highway (narrowband), only one car at a time can travel, however with broadband, you can have a highway with 6 or 8 lanes, allowing more traffic to pass at one specific time.Narrowband vs. Broadband
Narrowband is usually referred to dial up internet connection and it usually varies from speeds of about 50 characters per second to about 60 Kbps. Broadband is usually regarded as any internet connection that can deliver speeds faster than 60 kbps.
Types of Broadband internet Connections
There are a few types of broadband connections available, some are faster than others and some are more expensive than others to use. Depending on your needs, budget and availability will usually determine which type of broadband internet connection is right for you. They are:
ADSL (Asymmetric Digital Subscriber Line)
ADSL is a popular broadband media for both commercial and residential internet users in America. For the most part, anyone with a normal telephone line will usually have the ability to purchase ADSL from their telephone provider. ADSL works via normal phone lines and you can usually talk with your normal phone as you surf the internet. Speeds of ADSL vary, but are usually in the range of 128Kbps to over 5 Mbps when downloading data. Uploading is much slower, usually about 56K to 1 or 2 Mbps depending on the configuration. A normal dial up modem usually is only 56Kbps, so the fastest ADSL broadband connections deliver speeds that can be up to 89 times faster or more. It is also important to note that ADSL is usually marketed as DSL to make the name of the product sound less confusing. ADSL usually costs from about $30 to $60 per month.
SDSL Symmetric Digital Subscriber Line
One of the problems with ADSL is that the download speeds are much quicker than the upload speeds (usually by 100% or more). For consumers or businesses that upload lots of data this can create problems. SDSL is very similar to DSL service, in that it is provided by your telephone company over preexisting telephone lines, however, SDSL has uploads speeds that are the same as download speeds. Meaning if you have 1Mbps download, you will also have 1Mbps upload speeds. It is important to note that SDSL requires an additional phone line for this service to work properly. However, for most businesses, it is well worth the expense. SDSL can be more costly than ADSL and can cost from about $60 to $100 per month or more for residential customers.
Cable
If you have cable TV, you already know that TV signals are piped in through the cable running from the cable company into your home. Your internet broadband connection runs via these preexisting cables. Cable broadband is a very popular product in America and in some markets much more popular than ADSL. Speeds of Cable broadband vary, but are usually from 2 Mbps to over 8 Mbps. Download speeds are much faster than upload speeds and the cost is very similar to ADSL.
Wireless
Just like wireless telephones transmit data from one phone to another, so can wireless broadband. While it is not as popular due to the availability and newness of the technology, it is becoming more widespread. Usually all that is required is to connect your wireless phone to your laptop computer, essentially making your mobile phone a wireless modem. Speeds vary, but you can usually find speeds from 128 Kbps to about 2 Mbps for downloading data. Expect this technology to boom in the coming years and for speeds to increase as well. Prices also vary, but range from about $60 to about $200.
http://www.tech-faq.com/broadband.shtml
propose home network diagram
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ເປັນຕົວຢ່າງການສ້າງ home network diagram ແບບງ່າຍດາຍຈາກເວບ
http://www.gliffy.com/
Icon drop shadow problem (Windows XP) ບັນຫາ ມີເງົາຢູ່ ໄອຄອນຂອງວິນດໂດ ເອັກພີ
ເກີດຈາກຫຼາຍສາເຫດດ້ວຍກັນແຕ່ສຳລັບວີທີແກ້ໃຂແລ້ວແມ່ນໃຫ້
1 ຄລິກຂວາ Property ຂອງ Mycomputer
2 ໄປຫາ Performance > advance > setting
3 select > use drop show on icon labels on the desktop
let's fix the problem
1 right click on Mycomputer property
2 Performance>advance>setting
3 Select >use drop show on icon labels on the desktop
Done!!!
Thursday, November 12, 2009
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