Gig Zero Delay Tap & 10/100/1000BaseT Tap
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LED Indicators
• Power Indicator: Current power source LED illuminates white.
• Link/Activity Indicator: Located in the upper right hand corner. If a good
link is established, the LED illuminates. If there is current activity on this
link, the LED flashes.
• 10/100/1000 Indicator: Located in the upper left hand corner. If the Port
is set to 10 Mbps, the LED illuminates orange. If the Port is set to 100 Mbps,
the LED illuminates yellow. If the Port is set to 1000 Mbps, the LED
illuminates green.
Link Fault Detect
TM
The Gig Zero Delay Taps and 10/100/1000BaseT Taps have Link Fault Detect
on the Network ports. The Tap negotiates separately with each side of the full-
duplex link, detecting if either side fails. In the event of a failure, the Tap ceases
negotiation with the remaining side, enabling a clean fail-over to a redundant
network connection (if one is available). Link Fault Detect requires that both
sides of the full-duplex link and communicating at the same speed.
Cabling Guidelines
If both of the devices connected to the Tap network ports are 10/100BaseT
devices that do not support Automatic MDI/MDI-X Configuration (see
explanation, following), then specific cabling must be used in order to
maintain a successful link when power is removed from the Tap. In this case:
• If the link is currently made with a straight-through cable, connect TP-CU3
to the network with two straight-through cables.
• If the link is currently made with a cross-over cable, connect TP-CU3 to the
network with one cross-over cable and one straight-through cable.
In other words, Gig Zero Delay Taps and 10/100/1000BaseT Taps act as
straight-through connections. (The Net Optics 10/100BaseT Taps are different;
they act as crossover connections.)
Automatic MDI/MDI-X Configuration
The need for crossover cabling is eliminated by a feature in the 1000Base-T
standard called Automatic MDI/MDI-X Configuration (IEEE 802.3-2005,
40.4.4). Ports with this feature detect the positions of the transmit and receive
