Sun Microsystems manual Sun Enterprise 220R Server Owner’s Guide October

Pin	Mnemonic	Signal Name	Description
5	CTS	Clear to Send	Used by the DCE to indicate if it is ready to
			receive data from the DTE. When CTS, DSR,
			RTS and DTR are ON, the DCE is ready to
			transmit data received from the DTE across
			the communications channel. When only
			CTS is ON, the DCE is ready to accept
			dialing or control signals only. When CTS is
			OFF, the DTE should not transfer data across
			TXD.
6	DSR	Data Set Ready	Used by the DCE to indicate if it is ready to
			operate. When DSR is ON, the DCE is
			connected to the line and ready to exchange
			further control signals to start data transfer.
7	Gnd	Signal Ground
8	DCD	Data Carrier	Used by the DCE to indicate it is receiving a
		Detect	suitable signal from the communications
			channel.
9		Not connected	None.
10		Not connected	None.
11		Not connected	None.
12		Not connected	None.
13		Not connected	None.
14		Not connected	None.
15	TRXC	Transmit Clock	Used by the DCE to provide timing
			information to the DTE. The DTE provides
			data on TXD in which the transition of the
			bit corresponds to the rising edge of the
			clock.
16		Not connected	None.
17	RTXC	Receive Clock	Used by the DCE to provide timing
			information to the DTE. The falling edge of
			the clock corresponds to the center of the
			data bit received on RXD.
18		Not connected	None.
19		Not connected	None.
20	DTR	Data Terminal	Used to control switching of the DCE to the
		Ready	communications channel.
21		Not connected	None.
22		Not connected	None.

158 Sun Enterprise 220R Server Owner’s Guide • October 1999