Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

NIC flash light

Posted on 2008-10-02
4
439 Views
Last Modified: 2011-10-19
what is the NIC card flash light indicate?
i thought the answer is A...
Snap10.gif
0
Comment
Question by:Hiroyuki Tamura
4 Comments
 
LVL 16

Assisted Solution

by:JoWickerman
JoWickerman earned 40 total points
ID: 22624543
Hi,

A NIC operates at both Layer 1 and 2, which is why the TCP/IP model more accurately reflects the functions at those layers than the OSI model does. Yes, a NIC has a MAC address, and performs some Layer 2 functions, but it also is responsible for properly preparing the electrical signals to be transmitted onto the wire (or the RF to be transmitted into the air if you're talking WLAN) and receives and interprets those signals back. Perhaps most sources point to a NIC being a Layer 2 device, in reality, and for purposes of truly understanding networking, a NIC is both a Layer 1 and Layer 2 device.

Hope this clears up some confusion.

Cheers
0
 
LVL 32

Assisted Solution

by:aleghart
aleghart earned 40 total points
ID: 22627444
The lights are indicators for connectivity, speed, and traffic activity.  You're thinking of a physical failure.

There are no indicators for "I'm physically working."  So, you can't diagnose physical failure by lack of lights.

There may be a firmware problem, switch configuration problem, or NIC configuration problem, which aren't physical in nature.

Good indicators of physical level failure:

--do you smell smoke?
--is that regular or decaf coffee?
--who stole the computer?
0
 
LVL 2

Accepted Solution

by:
benten earned 45 total points
ID: 22627514
The OSI physical layer relates to electrical signaling. The OSI data link layer relates to LAN level connectivity (as opposed to WAN level). The lights on a NIC typically relate to LAN level connectivity. It is is usually on when the LAN connection is detected and off when one is not detected. It also flashes when link layer data packets are detected on the LAN segment it is attached to. That NIC light is sometimes commonly referred to as a "link light".
0
 

Author Closing Comment

by:Hiroyuki Tamura
ID: 31502389
thank you.
0

Featured Post

Easy, flexible multimedia distribution & control

Coming soon!  Ideal for large-scale A/V applications, ATEN's VM3200 Modular Matrix Switch is an all-in-one solution that simplifies video wall integration. Easily customize display layouts to see what you want, how you want it in 4k.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Even if you have implemented a Mobile Device Management solution company wide, it is a good idea to make sure you are taking into account all of the major risks to your electronic protected health information (ePHI).
I had an issue with InstallShield not being able to use Computer Browser service on Windows Server 2012. Here is the solution I found.
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question