Understanding Inter-Packet Gap Parameters for Network Cards

TABLE C–2Read-Only Parameters Deﬁning the Current Status

Parameter	Values	Description

link_status	0
	1
link_speed	0
	1
link_mode	0
	1

Current link status

=Link down

=Link up

Valid only if the link is up

=10 Mbps

=100 Mbps

Valid only if the link is up

=Half duplex

=Full duplex

Inter-Packet Gap Parameters

The PCI Fast Ethernet and Expansion (PFEX) ASIC supports the 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 C–3 lists the default values and allowable values for the inter-packet gap (IPG) parameters, ipg1 and ipg2.

TABLE C–3Read-Write Inter-Packet Gap Parameter Values and Descriptions

	Values
Parameter	(Byte-time)		Description
	(Byte-time)

ipg1	0,	255	ipg1 = 8	(default at initialization)
ipg2	0,	255	ipg2 = 4	(default at initialization)

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.)

28 Sun Quad FastEthernet PCI Adapter Installation and User's Guide ♦ Revision A, August 1997

Image 42

Sun Microsystems 805-1797-10 manual Inter-Packet Gap Parameters, Table C-2Read-Only Parameters Deﬁning the Current Status

Contents

Revision A, August USA 650 960-1300 fax 650 Revision A, August Please Recycle Contents Running Diagnostics Tests Regulatory Compliance Statements IndexPage Preface How This Book Is Organized Unix Commands Related Documents Typographic Conventions Shell Prompts Ordering Sun Documents Table P-1SunExpress Contact Information Sun Welcomes Your Comments XiiPage Product Overview 1Sun Quad FastEthernet PCI adapter Features Hardware and Software Requirements1Hardware and Software Requirements Checking the OpenBoot Prom Revision Level Displaying the OpenBoot Prom Revision LevelPage Installing the Adapter Using a text editor, add the following line to the endAdding an Entry to the driveraliases File Installing the Adapter Verifying the Installation Diagnostic TestingExamining Network Activity Code Example 2-1 watch-net-allCommad Output Rebooting the System Perform a reconﬁguration boot on the systemPage Conﬁguring the Driver Software Installing the Driver SoftwareAt the command line, use the grep command to search Conﬁguring the Host Files Etc/hosts ﬁle Booting From the Network Reboot your systemAt the ok prompt type Increasing TCP/IP Performance Post-Installation Procedures OptionalConﬁguring Driver Parameters As superuser root, type Forcing Network Speed Between 10 Mbps and 100 Mbps Type Auto-Negotiation Local-mac-address Property Ok setenv local-mac-address? true Page Speciﬁcations Physical Dimensions Table A-1Physical Dimensions Performance Speciﬁcations Power RequirementsTable A-2Power Requirements Table A-3Performance Speciﬁcations Speciﬁcations Page Interface Signals Figure B-132-Pin RJ-45 ConnectorsPage Conﬁguring the Quad FastEthernet Device Driver Parameters Internal Transceiver Driver Parameter Values and Deﬁnitions Table C-1qfe Driver Parameter, Status, and Descriptions Deﬁning the Current Status Qfe Driver Parameter, Status, and Descriptions Inter-Packet Gap Parameters Table C-2Read-Only Parameters Deﬁning the Current Status Table C-4Parameters Deﬁning lancemode and ipg0 Packet after receiving a packet Operational Mode Parameters Table C-5Operational Mode Parameters Table C-6Back-to-back Packet Transmission Capability Deﬁning the Number of Back-to-Back Packets to TransmitReporting Transceiver Capabilities Table C-7Read-Only Transceiver Capabilities Reporting the Link Partner Capabilities Table C-8Read-Only Link Partner Capabilities Setting qfe Driver Parameters Setting Parameters Using the ndd UtilityTo Specify the Device Instance for the ndd Utility Use the instance number to select the device To modify a parameter value, use the -setoption Using the ndd Utility in Interactive Mode To Set the Mode to Auto-Negotiation Select at least one of the ﬁve capabilities adv100fdxcap Setting Parameters in the /etc/system File Table C-9Setting Variables in the /etc/system File Setting Parameters Using the qfe.conf File Setting ipg Driver Parameters Using a qfe.conf File Unit-address = 2,1 Fourth line in the previous example Set the ipg1 and ipg2 parameters for the above four devices Kernel/drv/qfe.conf ﬁle Running Diagnostics Tests Using the OpenBoot Prom FCode Selftest Reset the system Shut down the systemType show-devsto display the list of devices Set the auto-boot?conﬁguration parameter to true Reset and reboot the systemPage Regulatory Compliance Statements FCC Class a Notice FCC Class B Notice DOC Class a Notice Avis DOC, Classe a DOC Class B Notice Avis DOC, Classe B Declaration of Conformity EMC Safety Supplementary InformationPage Index Index-51