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Cable and Pin Information SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide
Figure 28. TIA/EIA-232 Null-Modem Cable for 25-pin Connector
Use a null-modem (crossover) cable shown in Figure 29 to connect the
MANAGEMENT port to a terminal (DTE) with a 9-pin connector. Alternatively,
you can use a modem cable and a null-modem adapter. DTR (pin 4) and RTS (pin
7) must be on, or high, on your terminal or in your terminal emulation program.
Figure 29. EIA 232 Null-Modem Cable for 9-pin Connector