Sun Microsystems none manual Defining the Current Status, Inter-Packet Gap Parameters

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Defining the Current Status

The read-only parameters described in Table 3-2 explain the operational mode of the interface. These parameters define the current status.

Table 3-2Read-Only Parameters Defining the Current Status

Parameter

Values

Description

transceiver_inuse

0

= Internal transceiver

 

1

= External transceiver

link_status

 

Current link status

 

0

= Link down

 

1

= Link up

link_speed

 

Valid only if the link is up

 

0

= 10 Mbps

 

1

= 100 Mbps

link_mode

 

Valid only if the link is up

 

0

= Half duplex

 

1

= Full duplex

 

 

 

Inter-Packet Gap Parameters

The Fast Ethernet Parallel Port SCSI (FEPS) ASIC supports programmable Inter-Packet 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 auto-negotiation protocol is 10 Mbps. When the link speed is 100 Mbps, the total IPG is 0.96 microseconds.

Table 3-3 lists the default values and allowable values for the inter-packet gap (IPG) parameters, ipg1 and ipg2.

Table 3-3Read-Write Inter-Packet Gap Parameter Values and Descriptions

Parameter

Values

Description

 

(Byte-time)

 

 

 

 

ipg1

0, 255

ipg1 = 8 (default at initialization)

ipg2

0, 255

ipg2 = 4 (default at initialization)

 

 

 

Parameter Definitions

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Contents PlatformNotesThehmeFast Ethernet Device Driver Please Recycle Page Page Contents Setting Parameters Contents Vii Viii Related Documentation Introduction to the hme Fast Ethernet Device DriverDescribes the typographic conventions used in this book Typographic ConventionsOrdering Sun Documents Shell Prompts in Command ExamplesSun Welcomes Your Comments Hardware Overview Hme Device DriverAuto-Negotiation Operating Speeds and ModesExternal Transceiver Internal TransceiverPlatform Notes The hme Fast Ethernet Device Driver-May Driver Parameter Values and Definitions Parameter DefinitionsRead only Local transceiver auto negotiation Capability Inter-Packet Gap Parameters Defining the Current StatusLancemode Defines the lancemode and ipg0 parameters Operational Mode ParametersSelecting the Internal or External Transceiver Reporting Transceiver Capabilities Defining the Number of Back-to-Back Packets To TransmitDescribes the read-only link partner capabilities Reporting the Link Partner Capabilities= No 100Mbit/sec half-duplex transmission Platform Notes The hme Fast Ethernet Device Driver-May Parameter Options Setting ParametersIdentifying Device Instances Setting Parameters Using nddTo specify the device instance for the ndd utility To modify a parameter value Non-Interactive and Interactive ModesTo display the value of a parameter To modify a parameter value in interactive modeRefer to -1 through 3-8 for parameter descriptions To list all the parameters supported by the hme driverTo set the mode to auto-negotiation Setting Forced ModeTo set the TCP hiwater marks for best performance Setting Parameters in the /etc/system FileConfiguring TCP/IP for Maximum Performance To benchmark the TCP/IP throughputTo set the ipg1 to 10 and ipg2 to 5 when you reboot Setting Parameters Using the hme.conf File Specify name=hme and class=sbus

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