Instruction manual

ConneXium Ethernet Switch 499NES18100 8-Port 10/100 Base-TX Quick Reference Guide
8 31005416 02 August 2004
TP/TX Interface The TP/TX interface supports three specific functions:
Link control
The switch monitors the connected TP/TX line segments for short circuits and
interrupts. It uses regular link test pulses in accordance with IEEE standard 802.3
for 10/100 base-T. The switch module does not transmit any data to a TP/TX
segment from which it does not receive a link test pulse.
Autopolarity exchange
The switch automatically reverses polarity if the receive line pair is incorrectly
connected—if RD+ and RD- are switched.
Autocrossing
The switch detects the transmit and receive pairs (MDI, MDI-X). It automatically
configures its port for the correct transmit and receive pins. Consequently, it does
not matter whether you connect devices using a cross-over or straight cable.
Additional
Features
If the input voltages fall below a threshold, the ConneXium 499NES18100 switch will
be reset. After a reset, the ConneXium 499NES18100 switch will initialize.
ConneXium 499NES18100 Assembly and Startup
Unpacking When you unpack the ConneXium 499NES18100 switch module, compare your
package content with the scope of delivery provided in the product
specifications.Make sure that the delivery is complete and that none of the parts are
damaged. Use only undamaged parts when you assemble the module.
Assembly
Note: An unpopulated connection is assessed as a line interrupt. The TP/TX line
to any terminal equipment that has been switched off is also assessed as a line
interrupt since a de-energized bus coupler cannot transmit link test pulses.
ELECTRIC SHOCK HAZARD
Never insert pointed objects (thin screwdrivers, wires, etc.) into the inside of the subrack,
especially in the area behind the socket connectors.
Failure to follow this precaution will result in death, serious injury, or equipment
damage.
DANGER