Hirschmann RS20 User Manual page 155

Network Load Control
Workstation 1
Figure 40: Example of flow control
Flow Control with a full duplex link
In the example
2 and the device.
Before the send queue of port 2 overflows, the device sends a request to
Workstation 2 to include a small break in the sending transmission.
Note: The devices RS20/30/40, MS20/30, Octopus, MACH 100, RSR
and MACH 1000 support flow control in full duplex mode only.
Flow Control with a half duplex link
In the example
Workstation 2 and the device.
Before the send queue of port 2 overflows, the device sends data back so
that Workstation 2 detects a collision and interrupts the sending process.
Basic Configuration
Release 6.0 07/2010
Port 1 Port 4
Switch
Port 2 Port 3
Workstation 2
(see fig. 40) there is a full duplex link between Workstation
(see fig. 40) there is a half duplex link between
Workstation 3 Workstation 4
8.5 Flow Control
155