5-8
C122-B001-02EN
CHAPTER 5 Business LAN Management by GSWB
• auto-MDI/MDI-X function
The auto-MDI/MDI-X function is provided as a function of automatic negotiation.
When the automatic negotiation function is enabled, the auto-MDI/MDI-X function is
also enabled.
Flow control function
If the network load increases, the amount of input data may exceed the throughput of
the unit, and data may overflow from buffer memory. Therefore, when buffer
memory approaches full status, a receiving unit instructs the sending unit to wait for a
certain amount of time before sending the next data item. This can free buffer
memory and prevent the occurrence of data overflow. This type of traffic control
mechanism is referred to as flow control. Flow control varies depending on the
communication mode of a port. If a port uses half-duplex mode, a receiving unit
sends a collision (back pressure) to cause the sending unit to wait (enter standby
mode) before transmitting again. If a port uses the full-duplex mode, a receiving unit
sends a PAUSE frame in accordance with the IEEE802.3u standard to cause the
sending unit to wait (enter standby mode) before transmitting again.
• Support interface
The following table lists whether interfaces have the flow control function.
Table 5.8 Interface support for flow control
Y: Supported, N: Unsupported
LAN type Location
Interface
Flow control function
Back pressure
PAUSE frame
Business
LAN
Front
1000 BASE-T
Y
Y
BackPlane SerDes
N
Y
Summary of Contents for PRIMEQUEST 440
Page 1: ...C122 B001 02EN Front Cover SYSTEM DESIGN GUIDE ...
Page 2: ......
Page 6: ......
Page 8: ......
Page 14: ......
Page 16: ...viii C122 B001 02EN NOTE ON SAFETY Rear view Unit rear ...
Page 18: ...x C122 B001 02EN NOTE ON SAFETY PCI_Box Left side view Front view without cover ...
Page 20: ......
Page 106: ......
Page 127: ...C122 B001 02EN 4 21 4 2 MMB Functions Figure 4 15 Console Redirection Switch screen ...
Page 178: ...5 34 C122 B001 02EN CHAPTER 5 Business LAN Management by GSWB ...
Page 208: ......
Page 218: ......
Page 234: ......
Page 248: ......
Page 264: ......
Page 276: ......
Page 279: ......
Page 280: ...Back Cover ...