Hirschmann MACH 100

Network Load Control
Basic Configuration
Release 6.0 07/2010
8.5 Flow Control
155
Figure 40: Example of flow control
 Flow Control with a full duplex link
In the example (see fig. 40) there is a full duplex link between Workstation
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 (see fig. 40) there is a half duplex link between
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.
Switch
Port 3Port 2
Port 1 Port 4
Workstation 1 Workstation 2 Workstation 3 Workstation 4