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Configuring Basic Device Characteristics 9-11
Configuring the FLOW CONTROL Characteristic
Example: Enabling XON/XOFF FLOW CONTROL
The following example shows how to enable XON/XOFF FLOW CONTROL:
Local> CHANGE PORT 5 FLOW CONTROL XON
DSR
DSR FLOW CONTROL operates as follows:
•
If the access server receives data too quickly from the port device, it turns off DTR
until it can accept more data.
•
If the port device receives data too quickly from the access server, it turns off the
DSR signal until can accept more data.
Do not enable DSR FLOW CONTROL if modem control, signal control, DSR logout,
or signal check is enabled. DSR FLOW CONTROL overrides these characteristics.
Example: Enabling DSR FLOW CONTROL
The following example shows how to enable DSR FLOW CONTROL on a port:
Local> CHANGE PORT 5 FLOW CONTROL DSR
CTS
CTS is a form of FLOW CONTROL used with null modem (DTE) devices. The access
server only transmits data to an attached device when the device asserts DTS.
CTS FLOW CONTROL operates as follows:
•
If the access server receives data too quickly from the port device, the access
server deasserts RTS until it can accept more data.
•
If an attached device receives data too quickly from the access server, it deasserts
CTS until it can accept more data.
You can enable CTS/RTS FLOW CONTROL for access servers with attached
modems with a speed of 9600 bits/s or greater. This enables a faster response time from
the access server hardware.
Example: Enabling CTS FLOW CONTROL
The following command shows how to enable CTS FLOW CONTROL on port 7 of an
access server:
Local> CHANGE PORT 7 FLOW CONTROL CTS