Flow Control - Fujitsu PRIMEQUEST 480 System Design Manual

CHAPTER 5 Business LAN Management by GSWB
*3 Speed on one side is fixed to 10 Mbps and Speed on the other side is fixed to
100 Mbps.
Linkup may be successful on the side fixed to 10 Mbps but normal
communication is disabled. Match the Speed settings on both sides when the
fixed setting is used.
5.3.5

Flow control

Flow control setting
IEEE802.3x flow control is supported for full duplex communication, and
backpressure flow control is supported for half-duplex communication.
Note, however, that IEEE802.3x flow control operates differently depending on the
result of the auto-negotiation.
Flow control setting
Receive
Send
Notes on using flow control
Note that enabling the flow control may affect the transfer of other ports because the
flow control is also performed between GSWB internal chips.
In the sample configuration shown below, the transfer from IOU 0 0 to
GigabitEthernet 0/6 enables flow control and then a PAUSE frame is sent from
BCM5692 #1 to BCM5692 #0 to restrict the transfer from BCM5692 #0 to BCM5692
#1. Enabling the flow control thus affects the transfer from IOU 3 1 to IOU 4 0.
5-30
Table 5.20 Flow control setting
Fixed (10/100)
ON Enabled
OFF Disabled
ON Enabled
OFF Disabled
Interface Speed setting
Auto-negotiation
Result of auto-negotiation
Disabled
Result of auto-negotiation
Disabled
C122-B001-02EN