![]() 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. loopback cable is also known as loopback plug or loopback adapter, which is a plug used to test physical ports to identify network issue. ![]() Use the diagram appropriate to your electrical interface.ĭB-9 RS-232 Loopback Connection (TIA-574) Place the loopback plug into the T1 port and you should see the unit synch to itself by indicating either Link or having whatever is used for the WAN. 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. It provides system test engineers a simple but effective way of testing the transmission capability and receiver sensitivity of network equipment. ![]() Item number LB102 is a DB-25 loopback that is used to test RS-232 serial ports. The SC fiber optic loop back plug can be custom made the length and cable diameter, they are used in test applications. A loopback cable is also known as loopback plug or loopback adapter, which is a plug used to test physical ports to identify network issue. 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. Loopback plugs are generally used to route electronic signals and digital data streams from the source back to the. Additional loopback plugs can be purchased for a small charge. RS-422 Loopback Connections - Illustration. 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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