D-Link DES-5016FX Product Manual - Page 54

System Rate Control

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Fast Ethernet Switching System User's Guide System Rate Control The System Rate Control panel, displayed in Figure 26, allows you to set the packet forwarding rate on the DES-5016. There are two options: Store & Forward and CutThrough. Figure 26: System Rate Control The DES-5016 can be set for Store and Forward or Cut-Through. This is a global setting that affects all the ports except the RS-232 port. Store and Forward means that when the DES-5016 receives an incoming packet it "stores" the packet until the entire data packet has been received before it "forwards" the packet to a destination. In Cut-Through mode the DES-5016 begins sending out the packet as soon as it receives the first 128 bytes of data. The first 128 bytes contain the destination of the packet. Advantages of Store and Forward Store and Forward only sends out valid data packets. Bad packets created by collisions on the network or damaged packets are filtered out. Always use Store and Forward when some devices on the network run at 10 Mbps and others run at 100 Mbps. Disadvantages of Store and Forward Store and Forward requires more time because it receives the whole packet before sending it out. Every byte buffered is an additional eight microseconds of delay. For Managing the DES-5016 46

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Fast Ethernet Switching System User’s Guide
Managing the DES-5016
46
System Rate Control
The System Rate Control panel, displayed in Figure 26, allows you to set the packet
forwarding rate on the DES-5016. There are two options: Store & Forward and Cut-
Through.
Figure 26: System Rate Control
The DES-5016 can be set for Store and Forward or Cut-Through. This is a global setting
that affects all the ports except the RS-232 port.
Store and Forward means that when the DES-5016 receives an incoming packet it
“stores” the packet until the entire data packet has been received before it “forwards” the
packet to a destination.
In Cut-Through mode the DES-5016 begins sending out the packet as soon as it receives
the first 128 bytes of data. The first 128 bytes contain the destination of the packet.
Advantages of Store and Forward
Store and Forward only sends out valid data packets. Bad packets created by collisions on
the network or damaged packets are filtered out.
Always use Store and Forward when some devices on the network run at 10 Mbps and
others run at 100 Mbps.
Disadvantages of Store and Forward
Store and Forward requires more time because it receives the whole packet before
sending it out. Every byte buffered is an additional eight microseconds of delay. For