Net Optics 10_100_1000BaseT Tap - Manual (Page 10)

Gig Zero Delay Tap & 10/100/1000BaseT Tap
7
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, then
specific cabling must be used in order to maintain a successful link when
power is removed from the Tap. (See explanation, following.) In this case:
• If connecting to Switches or Hubs, use CAT5e RJ45 cross-over cabling.
• If connecting to Routers or NICs, use CAT5e RJ45 straight-through
cabling.
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
pins, and automatically connect them correctly. All 1000BaseT ports support
this feature, as do many 10/100BaseT ports on newer equipment.