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Fast EtherHub 3500 System User’s Guide
B-2 Pin Assignments
DB9 Serial Port Pin Description
Figure B-2
DB9 Serial Port
(on the Hub Side)
The DB9 serial port on the front panel is used to connect the
hub to a management device. The on-board menu-driven
configuration program can be accessed from a terminal, a PC
running a terminal emulation program, or from a remote
location via a modem connection. In-band management
software (which usually provides a graphical interface) can also
be used to manage the hub from a remote location via a modem
connection, by running SLIP over TCP/IP. You can use the
managment port to configure port settings (e.g., enabled or
disabled), or to update device firmware. The pin assignments
used to connect various device types to the hub’s managment
port are provided in the following tables.
EIA
Circuit
CCITT
Signal
Description
Hub’s
DB9 DTE
Pin #
PC DB9
DTE
Pin #
Modem
DB25 DCE
Pin #
Signal
Direction
DTE -DCE
CF 109
DCD (Data Carrier Detected)
1 1 8 < --------
BB 104
RxD (Received Data)
2 2 3 < --------
BA 103
TxD (Transmitted Data)
3 3 2 -------- >
CD 108.2
DTR (Data Terminal Ready)
4 4 20 -------- >
AB 102
SG (Signal Ground)
5 5 7 ----------
CC 107
DSR (Data Set Ready)
6 6 6 < --------
CA 105
RTS (Request-to-Send)
7 7 4 -------- >
CB 106
CTS (Clear-to-Send)
8 8 5 < --------
CE 125
RI (Ring Indicator)
9 9 22 < --------
Table B.2 DB9 Port Pin Assignments