SMS: Netspeed.com Internals

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The following are possible errorlevel values: The speed threshold is defined in the HKEY_LOCAL_MACHINE\ subtree under the following key:

   SOFTWARE\Microsoft\SMS\Components\SMS_MAINTENANCE_MANAGER
				

The DWORD setting is Slow Net Threshold Speed. The default is 0x352 (850 decimal).

You cannot use the Administrator tool to change this setting; you must change it manually if you do not want to use the default value. If you do change it, Maintenance Manager updates Netspeed.com in SMS_SHR during the next polling interval. If Systems Management Server is not configured to automatically update user logon scripts, you must manually copy the updated Netspeed.com to the location where Smsls.bat is being run from.

A total of 3,400 bytes are read from Netspeed.dat on the logon server. The speed is measured in the number of milliseconds to read the total bytes. The default of 3,400 bytes within 850 milliseconds indicates a fast link. If it takes 850 milliseconds or longer, it is considered a slow link.

You can display the errorlevel value with the command NETSPEED /V at a command prompt.

You can use the same method to approximate appropriate modem speed: multiply 3,400 bytes by 8 bits per byte. These 27,200 bits read within 850 milliseconds will be a fast link (this is roughly 31,280 bits per second), making most 28.8 modems the minimum fast network scenario.

The documentation incorrectly states a default value of 500 milliseconds; the correct default value is 850 milliseconds.