Section 4.3: Status Indicators
The status indicators are the tools that help you to find the current network status or network condition. The example of status indicators are link lights and collision lights. The link lights are present on network devices such as a hub to show the connectivity between two network devices. A network cable plugged into a network device must show the link light. If the lights are not lit then there must be a connectivity problem. The different colors are used to indicate the connection speed of a device.
The Collision lights are used on hubs, switches, and bridges to indicate an occurrence of a collision between two or more network devices. The collision occurs when more then one device tries to send data at the same time.