N-Tron 9000 user manual Connecting The Unit, Serial Interface, page 18 of

CONNECTING THE UNIT

For FX/FXE units, remove the dust cap from the fiber optic connectors and connect the fiber optic cables. The TX port on the FX/FXE models should be connected to the RX port of the far end station. The RX port on the FX/FXE versions should be connected to the TX port of the far end station.

For 10/100 Base-TX ports, plug a Category 5E twisted pair cable into the RJ45 connector. Connect the other end to the far end station. Verify that the LNK LED‟s are ON once the connection has been completed. To connect any other port to another Switch or Repeater, use a standard Category 5 straight through or crossover cable.

N-Tron recommends the use of pre-manufactured Cat5E cables to ensure the best performance. If this is not an option and users must terminate their own ends on the Cat5E cables; one of the two color coded standards shown to the right should be utilized. If a user does not follow one of these two color code standards then the performance and maximum cable distance will be reduced significantly, and may prevent the switch from establishing a link.

Warning: In absence of RSTP or Proprietary Ring control on the specific ports connected, creating a port to port connection on the same switch (i.e. loop) is an illegal operation and will created a broadcast storm which will crash the network!

SERIAL INTERFACE

The 9000 series switches provide an EIA-232 interface accessed via a 9 pin female connector (labeled „COM‟ on the unit). This is used to access the Command Line Interpreter (CLI). The pin-outs are shown below:

(Revised 2010-7-2) page 18 of 145