Sun Microsystems 220R manual Not connected

Pin	Mnemonic	Signal Name	Description
23		Not connected	None.
24	TXC	Terminal Clock	Generated by the DTE to provide timing
			information to the DCE. Used only in
			synchronous mode and only when the driver
			requests a locally generated clock.
			Otherwise, TXC echoes the modem-
			generated clock. The falling edge of the clock
			corresponds to the center of the data bit
			transmitted on TXD.
25		Not connected	None.

Appendix A Connector Signal Descriptions 159