Link connected question
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Posted by rtrickey on January 30, 2007, 8:05 pm
Please log in for more thread options Hi, I know this is probably an amazingly dumb question, but what *exactly* does it mean when an Ethernet link is connected? Does that mean it can sense the media, and it does some kind of test to make sure it can send and hear uncorrupted frames on the segment? It sounds like a really silly question, but I can't seem to find a definitive answer to it anywhere, everything just says "if the link light is on, you're connected"... ok, but what *exactly* does that mean? I ask more out of curiosity than any practical reason :) Thanks! | |||||||||||||||||||
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Posted by Denis Jedig on January 30, 2007, 9:53 pm
Please log in for more thread options On Wed, 31 Jan 2007 01:05:29 GMT rtrickey wrote: If you refer to the status LEDs commonly found on NICs and Ethernet Switches then your answer would be "it does receive Link Pulse sequences (10 Mbps Ethernet) or IDLE symbols (100 Mbps Ethernet and faster)". It does *not* imply any information on the quality of your link, there is no checking for correct transmission and and reception of frames. -- Denis Jedig syneticon networks GbR http://syneticon.net/service/ | |||||||||||||||||||
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Posted by rtrickey via HWKB.com on January 31, 2007, 12:15 pm
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Ah, thanks! Being only familiar with higher-level software-side stuff, I'd never heard of those before. Now I have something to google for more info, thanks again :) Denis Jedig wrote: >> I know this is probably an amazingly dumb question, but what *exactly* does
>> it mean when an Ethernet link is connected? Does that mean it can sense the >> media, and it does some kind of test to make sure it can send and hear >> uncorrupted frames on the segment? >
>If you refer to the status LEDs commonly found on NICs and Ethernet >Switches then your answer would be "it does receive Link Pulse sequences >(10 Mbps Ethernet) or IDLE symbols (100 Mbps Ethernet and faster)". > >It does *not* imply any information on the quality of your link, there is >no checking for correct transmission and and reception of frames. > -- Message posted via HWKB.com http://www.hwkb.com/Uwe/Forums.aspx/network-ethernet/200701/1 | |||||||||||||||||||
> it mean when an Ethernet link is connected? Does that mean it can sense the
> media, and it does some kind of test to make sure it can send and hear
> uncorrupted frames on the segment?