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Chapter 3 Configuring Driver Parameters 29
have enable-ipg0 enabled might not have enough time on the network. You can
add the additional delay by setting the ipg0 parameter from 0 to 255, which is the
media byte time delay.
TABLE 3-5 defines the enable-ipg0 and ipg0 parameters.
The vca device supports the programmable interpacket gap parameters (IPG) ipg1
and ipg2. The total IPG is the sum of ipg1 and ipg2. The total IPG is 0.096
microseconds for the link speed of 1000 Mbps.
TABLE 3-6 lists the default values and allowable values for the IPG parameters.
By default, the driver sets ipg1 to 8-byte time and ipg2 to 4-byte time, which are
the standard values. (Byte time is the time it takes to transmit one byte on the link,
with a link speed of 1000 Mbps.)
If your network has systems that use longer IPG (the sum of ipg1 and ipg2), and if
those machines seem to be slow in accessing the network, increase the values of
ipg1 and ipg2 to match the longer IPGs of other machines.
TABLE 3-5 Parameters Defining enable-ipg0 and ipg0
Parameter Values Description
enable-ipg0 0
1
enable-ipg0 enable
enable-ipg0 disable (Default=1)
ipg0 0 to 255 The additional time delay (or gap) before
transmitting a packet (after receiving the
packet) (Default=8)
TABLE 3-6 Read-Write Interpacket Gap Parameter Values and Descriptions
Parameter Values
(Byte-time)
Description
ipg1 0 to 255 Interpacket gap 1 (Default=8)
ipg2 0 to 255 Interpacket gap 2 (Default=4)