Allied Telesis AT-GS920/16 Installation And User Manual page 30

GS920 Series Gigabit Ehternet Switch Installation and User's Guide
A port operating in full-duplex mode uses PAUSE frames, as specified in
the IEEE 802.3x standard, to stop the transmission of data from an
end-node. Whenever the switch wants an end-node to stop transmitting
data, it issues this frame. The frame instructs the end-node to cease
transmission for a period of time specified within the frame. The switch
continues to issue PAUSE frames until it is ready again to receive data
from the end-node. This is referred to as flow control. Refer to Table 10,
"Flow Control - Supported Speeds" on page 30 for Backpressure and Flow
control support vs. port speed.
Table 10. Flow Control - Supported Speeds
Speed
Configuration
Auto Negotiation
1G Full Auto
100M Full
100M Half
10M Full
10M Half
This feature can be enabled or disabled by setting DIP switch # 5 (FLOW
CTRL). See "Flow Control" on page 82 for the procedure to enable and
disable this feature.
Note
The GS920 series switches DO NOT SUPPORT the combination of
Flooding & Flow Control. If both the flooding and flow control
features are enabled at once, traffic will be stopped by pause
packet.
For example: 1G traffic --> 10Mbps,100Mbps, then 1G traffic will be
10Mbps because of pause packet.
Flow Controllable
Pause Frame
Support
Support
Not Support
Not Support
Not Support
Not Support
Back Pressure
Support
Not Support
Not Support
Support
Not Support
Support
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