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Interpreting the Link and Speed LEDs

Chapter 4 Aggregator TAPs

rev. 1

Figure 12 Back panel showing power connectors and serial number

Interpreting the Link and Speed LEDs

When the TAP is powered up and correctly connected to functioning

devices, the Speed LED indicators simply show the connection speed.

The Link LED indicators are either lit steadily (idle) or flicker (data

transfer) depending on whether there is any traffic present.

Connection sequence

When powered up, the TAP performs a sequence of steps to

determine whether its link ports are connected to any devices, and

what speeds and other capabilities those devices have. The blinking

pattern of the LEDs indicate which step of the connection process the

TAP is performing. The duration of each state depends on the type of

equipment attached to each port of the TAP. Here are the connection

steps, listed in the order they occur:

1 Capabilities search. Both link ports/connections on the TAP are

attempting to attach to their respective devices and determine a

common speed and other capabilities. The LED pattern is that the

Speed LEDs flash and the Link LEDs flicker.

2 Connecting. The link parameters are attempting to connect using

the parameters determined during the Capabilities search. The

LED pattern is that the TAP shows the connection speed while

the Link LEDs continue to flicker.

3 Connected. Both link ports/connections are connected to the link

partners at a common speed. The Speed LED shows connection

speed. The Link LEDs light steadily (idle) or flicker depending on

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Black Box TS255A Spezifikationen Seite 48