
Connectors and Pin Assignments
893-00992-A
B-5
DB-9 (RS-232-D) Service Port Connector
The DB-9 service port connector (see
Figure B-4
) is configured as a data
communications equipment (DCE) device connector. The DSR and CTS signal
outputs are always asserted. The CD, DTR, RTS, and RI signal inputs are not
used. This arrangement allows a management station (a PC or terminal) to directly
connect to the switch using a straight-through cable.
Figure B-4.
DB-9 service port connector
Table B-2
shows the service port connector pin assignments.
Table B-2.
Service port connector pin assignments
Pin
Signal
Description
1
CD
Carrier detect (not used)
2
TXD
Transmit data (output)
3
RXD
Receive data (input)
4
DTR
Data terminal ready (not used)
5
GND
Signal ground
6
DSR
Data set ready (output always asserted)
7
RTS
Request to send (not used)
8
CTS
Clear to send (output always asserted)
9
RI
Ring indicator (not used)
Shell
–
Chassis ground
5
6
9
1
619EA
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