switch/router ports

Hi guys,
this might be a silly question. but just want to know this generally.
in switch/router. every port has one light on each side. one always stays stable and one blinks. does it mean anything ? or its just a stupid question.
have posted a pic with this. lights.JPG
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Typically light is blinking when traffic is forwarded through port. Stable light could show speed that is negotiated with host (typically color of light means negotiated speed), or just to show that port is up.

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Jeff GloverSr. Systems AdministratorCommented:
Steady light is the Link light. Means something is connected to the other end. Blinking one is activity. Traffic is going over the link. You can see the same thin on a computers network connection
Pete LongTechnical ConsultantCommented:
Just to add, on your image the device is telling you what the left hand light is?

Green connected at 100Mbps
Amber Connected at 1gbps

Therefore the light on the right is the activity indicator.
Mr.XAuthor Commented:
Thanks guys. Learned something new
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