Setting The Port Speed; Setting Modem Control; Setting Parity - Lucent Technologies PortMaster 4 Configuration Manual

Configuring Ports for Modem Use

Setting the Port Speed

The speed of a port is defined as the DTE baud rate. The PortMaster allows you to
specify three different baud rates for each port and one baud rate for host device ports.
Port speeds are sequentially matched from the first baud rate through the third baud
rate.
For example, when a connection with this port is established, the PortMaster uses the
first baud rate value to try to synchronize the connection speed. If no synchronization is
possible, the PortMaster tries to synchronize speeds using the second baud rate value. If
this fails, the third baud rate value is used. Each speed can be set between 300bps and
115200bps. The default speed is 9600bps.
Modern modems and terminals must always be set to run at a fixed rate. To define a
fixed rate, lock the DTE rate by setting all three speeds to the same value.
To set the port speed, use the following command—entered on one line:
Command> set C0|all speed [1|2|3] Speed
You can substitute any of the following for Speed:
300
600
You can set the speed for all the asynchronous ports simultaneously by using the
set all speed command.

Setting Modem Control

Set modem control on if you want to use the DCD signal for modem connections. When
modem control is on, the PortMaster uses the condition of the carrier detect line to
determine whether the line is in use. Modem control must be on for PortMaster
outbound traffic. If modem control is off, the PortMaster assumes the carrier detect line
is always asserted. As a result, the PortMaster cannot attach to the modem for outbound
traffic because it regards the line as busy.
To set modem control, use the following command:
Command> set C0 cd on|off

Setting Parity

The parity setting must be configured to match the parity setting on the attached
modem. The parity default value is none and must be used for ports configured for
network dial-in or dial-out operation.
Table 9-2 describes the parity options.
9-6
1200 4800
2400 9600
19200 57600
38400 76800
PortMaster 4 Configuration Guide
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