Specifications

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• Using Flash Memory, page 85
Console Port Signals
The console port on the RSP2 is an EIA/TIA-232, DCE, DB-25 receptacle. Both Data Set Ready (DSR)
and Data Carrier Detect (DCD) are active when the system is running. The Request To Send (RTS) signal
tracks the state of the Clear To Send (CTS) input. The console port does not support modem control or
hardware flow control. The console port requires a straight-through EIA/TIA-232 cable. Table 14 lists
the signals used on this port.
Auxiliary Port Signals
The auxiliary port on the RSP2 is an EIA/TIA-232, DTE, DB-25 plug to which you can attach a CSU or
DSU or other equipment in order to access the router from the network. The asynchronous auxiliary port
supports hardware flow control and modem control. Table 15 lists the signals used on this port.
Table 14 Console Port Signals
Pin Signal Direction Description
1 GND – Ground
2 TxD <— Transmit Data
3 RxD —> Receive Data
6 DSR —> Data Set Ready (always on)
7 GND – Ground
8 DCD —> Data Carrier Detect (always on)
Table 15 Auxiliary Port Signals
Pin Signal Direction Description
2 TxD —> Transmit Data
3 RxD <— Receive Data
4 RTS —> Request To Send (used for hardware flow
control)
5 CTS <— Clear To Send (used for hardware flow
control)
6 DSR <— Data Set Ready
7 Signal Ground – Signal Ground
8 CD <— Carrier Detect (used for modem control)
20 DTR —> Data Terminal Ready (used for modem
control only)