Wednesday, August 19, 2009

GSM PSTN


Ericsson's solution for GSM connection to a company's Intranet or to the Internet, includes the use of the PSTN between the GSM network and the access-server on the Intranet, or the access-server at the Internet Service Provider. Due to modem handshaking, the time for connection is very long, up to 40 seconds. The unit converting the GSM digital signals to PSTN analogue signals is called the GSM Interworking Unit (GIWU). It can be integrated in the MSC, and is then called DTI, Digital Transmission Internetworking Unit. On the established circuit-switched connection PPP (Point-to-Point protocol) is used. The IP traffic is carried by PPP. The long time for establishing this connection is a great disadvantage for
both users and network operators alike.


High Speed Circuit Switched Data (HSCSD), which uses more time slots, is available to circuit switched GSM. The standard is ready and Ericsson are shipping products. The standard allows for speeds of up to 64 kbps and is intended to be used by, for example, video conferencing and telemedicine applications.

Wireless WAN


This section will give a closer description of the wireless WAN systems mentioned in the earlier parts. The system's architecture, time-plans and characteristics are described here. As a comparison to the packet switching systems, Ericsson's solutions for GSM-data and HSCSD are included. The terms first, second and third generations cellular systems are introduced. The greatest importance is given to the systems of the second generation, to give a feeling of how far the standardization work has come. The section ends with a summary of the situation.

IP Addresses

You can use the command-line tool IPCONFIG to get network information such as your IP
address and to perform other tasks for troubleshooting network issues. However, if you prefer a graphical user interface over command lines, you can download a GUI tool that will run on Windows XP and Windows 2000. The tool that’s installed is Wntipcfg.exe. The tool identifies your IP address, subnet mask, and default gateway for each of your network interfaces, including the interface for your network adapter, your dial-up networking interface, and your PPTP interface. It allows you to click a button to Release, Renew, Release all, or Renew all when configuring an IP address.


To download and install the tool:

• Open the Windows 2000 Resource Kit tool download page Wntipcfg.exe: Windows NT IPConfig Utility
• Click the download link in the box at the top right corner of the page.
• In the File Download dialog box, select Save this program to disk.
• Select a location on your computer to save the file, and then click Save.
• In Windows Explorer, go to the location where you saved the downloaded file,
double-click the file to start the installation process, and then follow the
instructions.

To provide quick access from the Run line, install the program to C:\Documents and Setting\yourusername or the equivalent. Or, create a shortcut to the program on your start
menu or desktop.

Internet Time Server

Does your computer have the right time? If your computer is not part of a domain, you can synchronize your computer clock with an Internet time server. To do so:

• Double–click the time on your task bar.
• Click the Internet Time tab.
• Select the time server you want to use and make sure to select the Automatically
synchronize with an Internet time server check box.

Change Drive Letters

Change Drive Letters in XP

When you add drives to your computer, such as an extra hard drive, a CD drive, or a storage device that corresponds to a drive, Windows automatically assigns letters to the drives. However, this assignment might not suit your system; for example, you might have mapped a network drive to the same letter that Windows assigns to a new drive. When you want to change drive letters, follow these steps:

• Right-click My Computer, and then click Manage.
• Under Computer Management, click Disk Management. In the right pane, you’ll see
your drives listed. CD-ROM drives are listed at the bottom of the pane.
• Right-click the drive or device you want to change, and then click Change Drive
Letter and Paths.
• Click Change, click Assign the following drive letter, click the drive letter you want
to assign, and then click OK.

Turn off Autoplay

How can you stop Windows XP from launching program CDs?

• Click Start, click Run, type GPEDIT.MSC to open Group Policy in the Microsoft Management Console.
• Double-click Computer Configuration, double-click Administrative templates, double-click System, and then click Turn off autoplay.
• The instructions on your screen describe how to configure this setting. Click Properties to display the setting dialog.
• Click Enabled, and choose CD-ROM drives, then click OK, to stop CD autoplay. This setting does not prevent Autoplay for music CDs.

Auto Login



• Go to Start/Run, and type 'control userpasswords2'.
• From Users Tab, Uncheck "Users must enter ...."
• A dialog will allow setting a user and password to be used automatically.

Load Internet Explorer

Load Internet Explorer the Fastest Way Possible
  • Edit your link to start Internet Explorer to have -nohome after it. For Example:


"C:\Program Files\Internet Explorer\IEXPLORE.EXE" -nohome
This will load internet explorer very fast because it does not load a web page while it is
loading. If you want to go to your homepage after it is loaded, just click on the home
button.

IDE Devices


DMA Mode on IDE Devices

Just like Windows 2000, Windows XP still fails to set the DMA mode correctly for the IDE device designated as the slaves on the primary IDE and secondary IDE channels. Most CD-ROMS are capable of supporting DMA mode, but the default in XP is still PIO. Setting it to DMA won't make your CD-ROM faster, but it will consume less CPU cycles. Here's how:

• Open the Device Manager. One way to do that is to right-click on "My Computer",
select the Hardware tab, and select Device Manager.
• Expand "IDE ATA/ATAPI Controllers" and double-click on "Primary IDE Channel".
• Under the "Advanced Settings" tab, check the "Device 1" setting. More than likely,
your current transfer mode is set to PIO.
• Set it to "DMA if available".
• Repeat the step for the "Secondary IDE Channel" if you have devices attached to
it. Reboot.

Hibernation

Remove Hibernation File

If you do not use hibernation, make sure you do not have it enabled, which reserves disk
space equal to your RAM. If you have a hidden file on the root directory of your C-drive
called hiberfil.sys, hibernation is enabled. To remove that file:


• Go to Control Panel, select Performance and Maintenance, Power Options,
Hibernate tab, and uncheck the Enable hibernation box.

Increase Performance

Performance Increase Through My Computer


Easy enough tweak to usually find out about it on your own, but still, some of us still don't
find it right away. So here it is:
• Start > right-click on My Computer and select Properties.
• Click on the "Advanced" tab.
• See the "Performance" section? Click "Settings".
• Disable the following:
Fade or slide menus into view
Fade or slide ToolTips into view
Fade out menu items after clicking
Show Shadows under menus
Slide open combo boxes
Slide taskbar buttons
Use a background image for each folder type
Use common tasks in folders
There, now Windows will still look nice and perform faster.

Improve Performance

Clean Your Prefetch to Improve Performance

This is a unique technique for WinXP. We know that it is necessary to scrub registry and
TEMP files for Win9X/ME/2000 periodically. Prefetch is a new and very useful technique in
Windows XP. However, after using XP some time, the prefetch directory can get full of
junk and obsolete links in the Prefetch catalog, which can slow down your computer
noticeably.
• Open C(system drive):/windows/prefetch, delete those junk and obsolete files,
reboot. It is recommended that you do this every month.

GSM ISDN

Ericsson also has an improved solution for GSM connections to the Intranet/Internet. By switching the modem link over PSTN to an ISDN PRA (Primary Rate Access) in the MSC, and a commercial router, analog communications is never required. In this case, the time for establishing connection drops to less than 10 seconds due to ISDN's fast connection times. ISDN with rate adaption is run between the router and the MSC according to the V.110 standard. This is a stopgap solution.

Tag

Assignment Lanka Tag Cloud
Computer Networks The History of Local Area Networks, LAN, The Topologies of a Networks, LANs describe different types of transmission Medias, Local Area Networks Access Methods, Carrier Sense Multiple Access with Collision Detect, Development of LAN Technologies. LAN -Token Ring, LAN Ethernet Digital, LAN - Ethernet Sun microsystems, LAN - Ethernet Mixed Environment, LAN - Token Ring was introduced by IBM LAN - IBM implementation of Token Ring, Token Ring Novell, LAN Token Ring - in a mixed environment, LAN - Fiber Distributed Data Interface, LAN - ATM, LAN Components, LAN Switching Methods, Virtual Local Area Network, Port based VLAN, Mac based VLAN, Protocol based VLAN, User Base VLAN, PC networks Components, PC networks Shared resources, PC Network operating systems, PC networks Novell Netware, PC networks Windows NT, PC networks IBM LAN Server Computer Programming Languages HTML Language, The Generations of Programming Languages, Different types of High Level Languages, Different types of High Level Languages Disadvantages
Computer Networks - IBM LAN Server, Windows NT Networks, Novell Netware, Network operating systems, Networks Shared, Networks Components, User Base, Protocol based, Mac based, Port based, VLAN, LAN Switching, LAN Components, ATM, Fiber Data, Token Ring, Token Ring Novell, IBM implementation, Ethernet, Sun microsystems, Ethernet Digital, Token passing, LAN Technologies, CSMA/CD, Access Methods, Transmission, Networks, The History of Local Area Networks, LAN