All other pins are for modem control signal tests and are not necessary to connect unless you wish to test those signals. Pins marked in red are the data lines, Tx and Rx, and are necessary for the loopback and BERT testing. Use the diagram appropriate to your electrical interface.ĭB-9 RS-232 Loopback Connection (TIA-574) If you want to test modem control signals or you need to construct your own loopback, follow the instructions below. Please contact your sales representative for more information. If I set the interface to 1000 the interface shows down/down. If I put the cisco interface speed to 100 my interface links up. I need to make a loopback plug to do a hard loop. Item number LB102 is a DB-25 loopback that is used to test RS-232 serial ports. I am trying to do some testing through different parts of a circuit connected to a cisco router. ![]() Item number LB101 is a DB-9 loopback that is specially constructed to test data signals on RS-232 and Sealevel RS-422, RS-485 serial ports. Additional loopback plugs can be purchased for a small charge. Sealevel serial I/O devices typically include a loopback plug with each shipment that can be used to test data lines.
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