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60 Sun Quad FastEthernet 6U CompactPCI Adapter Installation and User’s Guide • June 2000
Parameters that Define the Current Status
The read-only parameters described in TABLE B-2 explain the operational mode of the
interface. The following parameters display the current status of an interface.
Interpacket Gap Parameters
The adapter’s PCI fast Ethernet and expansion (PFEX) ASIC supports programmable
Interpacket Gap (IPG) parameters ipg1 and ipg2. The total IPG is the sum of ipg1
and ipg2. The total IPG is 9.6 microseconds when the link speed set by the
autonegotiation protocol is 10 Mbps. When the link speed is 100 Mbps, the total IPG
is 0.96 microseconds.
TABLE B-3 lists the default values and allowable values for the IPG parameters ipg1
and ipg2.
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 either 100 Mbps or 10 Mbps.)
TABLE B-2 Read-Only Parameters Defining the Current Status
Parameter Description
link_status Current link status
0 = Link down
1 = Link up
link_speed Current link speed (valid only if the link is up)
0 = 10 Mbps
1 = 100 Mbps
link_mode Current link mode (valid only if the link is up)
0 = Half duplex
1 = Full duplex
TABLE B-3 Read-Write Interpacket Gap Parameter Values and Descriptions
Parameter
Values
(Byte-time) Description
ipg1 0 to 255 ipg1 = 8 (default at initialization)
ipg2 0 to 255 ipg2 = 4 (default at initialization)