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Chapter 3 Configuration
23
Port # Connection Type: Five options to choose from: auto, 10M half-duplex, 10M full-
duplex, 100M half-duplex or 100M full-duplex. Sometimes, there are Ethernet
compatibility problems with legacy Ethernet devices. You can configure different types
to solve the compatibility issues.
Port # Rate Limit: When it is enabled, enter a rate value that is configured as multiple
of 32kbps. This function limits the inbound and outbound Ethernet throughput around
the value that you specified.
IPv4 TOS priority Control: TOS, Type of Services, is the 2
nd
octet of IP packet. The
bits 6-7 of this octet are reserved and bit 0-5 are used to specify the priority of the
packet. The definition of these bits is listed blow:
Two bits: reserved
One bit: high reliability
One bit: high throughput
One bit: No delay
Three bits: IP priority (0 to 7)
This feature uses bits 0-5 to classify the packets’ priority. If the packet is in high priority,
it will flow first and will not be constrained by the Rate Limit. Therefore, when this
feature is enabled, the embedded Ethernet switch IC will check the 2
nd
octet of each IP
packet. If the value in the TOS field matches in the checked values in the table (0 to 63),
this packet will treat it as high priority.