Black Box TS255A Specifications download pdf (Page 23)

Interpreting the Link and Speed LEDs

Chapter 2 Copper TAPs

rev. 1

or both power supply sockets. Connecting both sockets to different

external power sources (using Network Instrument’s optional adapter

kit TC2P-K) provides fail-safe power redundancy for the Analyzer

side. The network pass-through link remains unaffected even if power

to the TAP is interrupted. For a detailed description of what happens,

read the information in “10/100/1000 TAP” on page 24.

Figure 6 Back panel showing power connectors and serial number

Interpreting the Link and Speed LEDs

This section describes the LEDs and what they mean when they flash

and flicker on the 10/100 and 10/100/1000 TAPs.

10/100 TAP

The 10/100 TAP is passive, which means no packets are lost or

delayed if power is lost. The 10/100 TAP supports Power over

Ethernet (PoE).

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 the 10 and 100 LEDs are solidly lit until

a connection speed is determined.

2 Connecting. After a connection speed is determined, then that

speed’s connection LED remains lit while the other goes dark.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 63 64

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Black Box TS255A Specifications Page 23