Figure B-2 Null Modem Cable (Sun System Supplies Clocking For Both Sides) - Sun Microsystems Sun PCI High Speed User Manual

illustrates a synchronous null modem cable that allows you to another
FIGURE B-2
system, Sun or non-Sun, using the RS-449 interface. The Sun supplies both the
transmit and receive clocks for the other system. Note that this null modem cable is
not symmetrical.
Null modem Cable (Sun System Supplies Clocking for Both Sides)
FIGURE B-2
TxD (4,22)
RxD (6,24)
RTS (7,25)
CTS (9,27)
DSR (11,29)
SG (19)
DCD (13,31)
RxC (8,26)
DTR (12,30)
TxC (17,35)
Sun workstation
that supplies clocking
TxD (4,22)
RxD (6,24)
RTS (7,25)
CTS (9,27)
DSR (11,29)
SG (19)
DCD (13,31)
TxCI (5,23)
RxC (8,26)
DTR (12,30)
Sun or foreign
device
Appendix B Null Modem Cable Requirements 33