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digital signal processing...
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Saturday, April 26, 2008
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In a baseband transmission, the entire bandwidth of the cable is consumed by a single signal. In broadband transmission, signals are sent on multiple frequencies, allowing multiple signals to be sent simultaneously.



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Baseband Signalling:

1)Uses digital signalling

2)No frequency-division multiplexing

3)Bi-directional transmission

4)Signal travels over short distances


Broadband Signalling:

1)Uses analog signalling

2)Unidirectional transmission

3)Frequency-division multiplexing is possible

4)Signal can travel over long distances before being attenuated

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Monday, April 28, 2008
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Silly window syndrome is a problem in computer networking caused by poorly-implemented TCP flow control. If a server with this problem is unable to process all incoming data, it requests that its clients reduce the amount of data they send at a time (the "window" setting on a TCP packet). If the server continues to be unable to process all incoming data, the window becomes smaller and smaller, sometimes to the point that the data transmitted is smaller than the packet header, making data transmission extremely inefficient. The name of this problem is due to the window size shrinking to a "silly" value.

Since there is a certain amount of overheadassociated with processing each packet, the increased number of packets means increased overhead to process a decreasing amount of data. The end result is thrashing.

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It is any routing protocol used within an autonomous system.
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Anil Kumar
Tuesday, June 03, 2008 6:29 AM
An Interior Gateway Protocol is used to exchange routing information within an autonomous system. Examples of IGP include OSPF (Open Shortest Path First) and RIP (Routing Information Protocol).
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  • To run the count program, which will display the process identification number of the job, enter: count &
  • To check the status of your job, enter: ps
  • To bring a background process to the foreground, enter: fg
  • If you have more than one job suspended in the background, enter: fg %#

    Replace  #  with the job number, as shown in the first column of the output of the jobs command.

  • You can kill a background process by entering: kill PID

    Replace PID with the process ID of the job. If that fails, enter the following:

    kill -KILL PID
  • To determine a job's PID, enter: jobs -l
  • If you are using sh, ksh, bash, or zsh, you may prevent background processes from sending error messages to the terminal. Redirect the output to /dev/null using the following syntax: count 2> /dev/null &
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    Sunday, May 11, 2008
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    df -lk
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    Sunday, May 11, 2008
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