Loopback Connectors
This test requires null modem and plug connectors, which are described in Appendix A, Loopback Connectors.
There are a variety of loopback paths available. The exact type of loopback connector required depends on the system I/O panel.
The loopback for the "Null Modem a to b" option is a female-to-female plug. Its pin configuration is the same as the one described for the "9-Pin to 9-Pin Port-to-Port Loopback Cable".
The loopback for the "Plug a to a" option is described in the section "9-pin Female Single-Port Loopback Plug".
Note -
sutest supports any pair of ports, not just a and b.
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