3Com 3031 Command Reference Manual page 159

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Serial interface view
Parameter
baudrate: Baud rate of serial interface in bps. It is in the range of 300 to 115200
for an asynchronous serial interface and 1200 to 2048000 for a synchronous serial
interface.
Description
Using the baudrate command, you can set the baud rate for a serial interface.
By default, the baud rate is 9600 bps on the asynchronous serial interface and
64000 bps on a synchronous serial interface.
Following are the baud rates available for the asynchronous serial interface.
300 bps, 600 bps, 1200 bps, 2400 bps, 4800 bps, 9600 bps, 19200 bps, 38400
bps, 57600 bps, 115200 bps.
Following are the baud rates available for the synchronous serial interface.
1200 bps, 2400 bps, 4800 bps, 9600 bps, 19200 bps, 38400 bps, 57600 bps,
64000 bps, 72000 bps, 115200 bps, 128000 bps, 384000 bps, 2048000 bps.
The baud rate range available for the synchronous serial interface depends on the
applied physical electric specifications.
V.24 DTE/DCE supports the range of 1200 bps to 64000 bps
V.35 DCE/DCE, X.21 DTE/DCE, EIA/TIA-449 DTE/DCE and EIA-530 DTE/DCE
supports the range of 1200 bps to 2048000 bps
After a synchronous/asynchronous serial interface makes the synchronous/
asynchronous switchover, the baud rate of the interface will resume the default
baud rate in the new operating mode.
When setting baud rate for a serial interface, you should take into consideration
the elements, such as operating mode (synchronous/asynchronous mode) and the
electric specifications of the connected external cable. In addition, you should note
that the baud rate of asynchronous serial interface is only significant for the
connection between router and modem. If two modems are concerned, they will
negotiate the baud rate between them. Therefore, different baud rate settings can
be set on the routers at the two ends of a connection, if the routers are working in
asynchronous mode. In synchronous mode, however, the router working as DCE
will determine the baud rate for the line transmission. Therefore, you must set
baud rate at the DCE side.
Example
Set the baudrate of the asynchronous serial interface to 115200bps.
[3com-Serial0/0/0]baudrate 115200
Fundamental WAN Interface Configuration Commands 159