How does router recognize pc

Gateway / Performance 1000
April 9, 2009 at 08:09:05
Specs: Windows XP
This question is just out of curiosity. When I connect my pc to my router, a green LED lights up on the router showing that my pc is connected. What signal is the router/pc using to know that the pc is connected? I know that the pc & router send packets to each other (there is a seperate "activity" LED for that). But if my pc is sitting idle, I would assume that few packets are being sent, if any. Yet, the green LED remains on until the instant I disconnect the wire. Is there a different signal besides the actual packets?

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#1
April 9, 2009 at 08:57:06
When ever you connect two network devices via Ethernet the they both start sending each other handshaking signals. These signals are present independent of any software that is running and will continue as along as power is applied. It is these signals that keep the light lit. There should be an equivalent light on the NIC. On some NICs there will just be one light that will be steady when the is no data and flashing while data is being transmitted.

Stuart


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#2
April 13, 2009 at 09:02:08
Thanks!

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#3
April 13, 2009 at 12:32:11
Stuart,

Would you be able to point me to information on the internet that would explain the handshaking in technical detail? Something that would explain/show the waveform/protocol?


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#4
April 13, 2009 at 13:13:13
You would have to get technical information from the equipment manufactures. Its is built into all network devices and is not something the user needs worry about. There is nothing you can do with, you cannot change it and nor would you want to.

If you do a search on Ethernet Protocol on Google you may find something.

Stuart


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