Sun Pin-outs

I have a stupid question about Sun Netra T1 Pin-outs

Here is what I got:

1	RTS
2	DTR
3	TXD
4	SG
5	SG
6	RXD
7	DSR
8	CTS


I'm so used to using DCD on the unix machine for modem control.  But I
see no DCD here.  How am I to use CLOCAL on the Sun side to know when
someone is connected on the console or not?

Thanks,
Chris Fowler