Sun-microsystems Sun PCI High Speed Quad Port Serial Interface Adap User Manual Page 53

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Appendix B Null Modem Cable Requirements 33
FIGURE B-2 illustrates a synchronous null modem cable that allows you to another
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.
FIGURE B-2 Null modem Cable (Sun System Supplies Clocking for Both Sides)
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
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
that supplies clocking
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