Transmission MIB Working Group                                  [Page 7]RFC 1284                 ETHERNET-LIKE OBJECTS             December 1991        STATUS  mandatory        DESCRIPTION                "The transmit layer management state variable                (transmitEnabled as defined in [9]) for a                particular interface.  The value true(1) signifies                that the MAC frame transmission is enabled on said                interface. The value false(2) signifies that the                MAC frame transmission is inhibited on said                interface. In particular, the value of an instance                of this object is false(2) whenever the value of                the corresponding instance of the                dot3MacSubLayerStatus object is disabled(2).                Each alteration of an instance of this object to                the value true(1) is analogous to an invocation of                the enableTransmit action defined in [9] and has                the effect of enabling MAC sublayer frame                transmission on the associated interface. In                particular, such an alteration has the effect of                setting the transmit layer management state                variable (transmitEnabled in [9]) for said                interface to be true.                Each alteration of an instance of this object to                the value false(2) is analogous to an invocation                of the disableTransmit action defined in [9] and                has the effect of inhibiting MAC sublayer frame                transmission on the associated interface. In                particular, such an alteration has the effect of                setting the transmit layer management state                variable (transmitEnabled in [9]) for said                interface to be false. Any transmissions in                progress are completed before transmission is                inhibited."        ::= { dot3Entry 5 }    dot3TestTdrValue OBJECT-TYPE        SYNTAX  Gauge        ACCESS  read-only        STATUS  mandatory        DESCRIPTION               "The number of 10 MHz ticks which elapsed between               the beginning of a TDR measurement and the               collision which ended it, for the most recently               executed TDR test.  If no TDR test has been               executed, or the last TDR value is not available,              this object has the value 0."        ::= { dot3Entry 6 }Transmission MIB Working Group                                  [Page 8]RFC 1284                 ETHERNET-LIKE OBJECTS             December 1991    -- the Ethernet-like Statistics group    -- Implementation of this group is mandatory    -- Due to implementation restrictions (e.g. in the    -- instrumentation provided by a chipset, or a device    -- driver), some of the counters in this group may be    -- difficult or impossible to implement.    -- In such cases, an implementator should apply reasonable    -- best effort to detect as many occurrences as possible.    -- In any case, the value of a counter will be the number    -- actually detected, which will always be less or equal    -- to the number of actual occurrences.  In the extreme    -- case of a total inability to detect occurrences, the    -- counter will always be zero.    -- Vendors are strongly encouraged to document in user guides and    -- other appropriate documentation the conditions under which the    -- values of the counters in this group may represent an    -- underestimate of the true count.    dot3StatsTable OBJECT-TYPE        SYNTAX  SEQUENCE OF Dot3StatsEntry        ACCESS  not-accessible        STATUS  mandatory        DESCRIPTION                "Statistics for a collection of ethernet-like                interfaces attached to a particular system."        ::= { dot3 2 }    dot3StatsEntry OBJECT-TYPE        SYNTAX  Dot3StatsEntry        ACCESS  not-accessible        STATUS  mandatory        DESCRIPTION                "Statistics for a particular interface to an                ethernet-like medium."        INDEX   { dot3StatsIndex }        ::= { dot3StatsTable 1 }    Dot3StatsEntry ::=        SEQUENCE {            dot3StatsIndex                INTEGER,            dot3StatsAlignmentErrors                Counter,            dot3StatsFCSErrors                Counter,Transmission MIB Working Group                                  [Page 9]RFC 1284                 ETHERNET-LIKE OBJECTS             December 1991            dot3StatsSingleCollisionFrames                Counter,            dot3StatsMultipleCollisionFrames                Counter,            dot3StatsSQETestErrors                Counter,            dot3StatsDeferredTransmissions                Counter,            dot3StatsLateCollisions                Counter,            dot3StatsExcessiveCollisions                Counter,            dot3StatsInternalMacTransmitErrors                Counter,            dot3StatsCarrierSenseErrors                Counter,            dot3StatsExcessiveDeferrals                Counter,            dot3StatsFrameTooLongs                Counter,            dot3StatsInRangeLengthErrors                Counter,            dot3StatsOutOfRangeLengthFields                Counter,            dot3StatsInternalMacReceiveErrors                Counter        }    dot3StatsIndex OBJECT-TYPE        SYNTAX  INTEGER        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "An index value that uniquely identifies an                interface to an ethernet-like medium.  The                interface identified by a particular value of this                index is the same interface as identified by the                same value of ifIndex."        ::= { dot3StatsEntry 1 }    dot3StatsAlignmentErrors OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of frames received on a particular                interface that are not an integral number of                octets in length and do not pass the FCS check.Transmission MIB Working Group                                 [Page 10]RFC 1284                 ETHERNET-LIKE OBJECTS             December 1991                The count represented by an instance of this                object is incremented when the alignmentError                status is returned by the MAC service to the LLC                (or other MAC user). Received frames for which                multiple error conditions obtain are, according to                the conventions of [9], counted exclusively                according to the error status presented to the                LLC."        ::= { dot3StatsEntry 2 }    dot3StatsFCSErrors OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of frames received on a particular                interface that are an integral number of octets in                length but do not pass the FCS check.                The count represented by an instance of this                object is incremented when the frameCheckError                status is returned by the MAC service to the LLC                (or other MAC user). Received frames for which                multiple error conditions obtain are, according to                the conventions of [9], counted exclusively                according to the error status presented to the                LLC."        ::= { dot3StatsEntry 3 }    dot3StatsSingleCollisionFrames OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of successfully transmitted frames on a                particular interface for which transmission is                inhibited by exactly one collision.                A frame that is counted by an instance of this                object is also counted by the corresponding                instance of either the ifOutUcastPkts or                ifOutNUcastPkts object and is not counted by the                corresponding instance of the                dot3StatsMultipleCollisionFrames object."       ::= { dot3StatsEntry 4 }Transmission MIB Working Group                                 [Page 11]RFC 1284                 ETHERNET-LIKE OBJECTS             December 1991    dot3StatsMultipleCollisionFrames OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of successfully transmitted frames on a                particular interface for which transmission is                inhibited by more than one collision.                A frame that is counted by an instance of this                object is also counted by the corresponding                instance of either the ifOutUcastPkts or                ifOutNUcastPkts object and is not counted by the                corresponding instance of the                dot3StatsSingleCollisionFrames object."        ::= { dot3StatsEntry 5 }    dot3StatsSQETestErrors OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of times that the SQE TEST ERROR message                is generated by the PLS sublayer for a particular                interface. The SQE TEST ERROR message is defined                in section 7.2.2.2.4 of [12] and its generation is                described in section 7.2.4.6 of the same                document."        ::= { dot3StatsEntry 6 }    dot3StatsDeferredTransmissions OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of frames for which the first                transmission attempt on a particular interface is                delayed because the medium is busy.                The count represented by an instance of this                object does not include frames involved in                collisions."        ::= { dot3StatsEntry 7 }    dot3StatsLateCollisions OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatoryTransmission MIB Working Group                                 [Page 12]RFC 1284                 ETHERNET-LIKE OBJECTS             December 1991        DESCRIPTION                "The number of times that a collision is detected                on a particular interface later than 512 bit-times                into the transmission of a packet.                Five hundred and twelve bit-times corresponds to                51.2 microseconds on a 10 Mbit/s system. A (late)                collision included in a count represented by an                instance of this object is also considered as a                (generic) collision for purposes of other                collision-related statistics."        ::= { dot3StatsEntry 8 }    dot3StatsExcessiveCollisions OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of frames for which transmission on a                particular interface fails due to excessive                collisions."        ::= { dot3StatsEntry 9 }    dot3StatsInternalMacTransmitErrors OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of frames for which transmission on a                particular interface fails due to an internal MAC                sublayer transmit error. A frame is only counted                by an instance of this object if it is not counted                by the corresponding instance of either the                dot3StatsLateCollisions object, the                dot3StatsExcessiveCollisions object, the                dot3StatsCarrierSenseErrors object, or the                dot3StatsExcessiveDeferrals object.                The precise meaning of the count represented by an                instance of this object is implementation-                specific.  In particular, an instance of this                object may represent a count of transmission                errors on a particular interface that are not                otherwise counted."        ::= { dot3StatsEntry 10 }Transmission MIB Working Group                                 [Page 13]RFC 1284                 ETHERNET-LIKE OBJECTS             December 1991    dot3StatsCarrierSenseErrors OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "The number of times that the carrier sense                condition was lost or never asserted when                attempting to transmit a frame on a particular                interface.                The count represented by an instance of this                object is incremented at most once per                transmission attempt, even if the carrier sense                condition fluctuates during a transmission                attempt."        ::= { dot3StatsEntry 11 }    dot3StatsExcessiveDeferrals OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of frames for which transmission on a                particular interface is deferred for an excessive                period of time."        ::= { dot3StatsEntry 12 }    dot3StatsFrameTooLongs OBJECT-TYPE        SYNTAX  Counter        ACCESS  read-only        STATUS  mandatory        DESCRIPTION                "A count of frames received on a particular                interface that exceed the maximum permitted frame                size.                The count represented by an instance of this                object is incremented when the frameTooLong status                is returned by the MAC service to the LLC (or                other MAC user). Received frames for which                multiple error conditions obtain are, according to                the conventions of [9], counted exclusively                according to the error status presented to the                LLC."        ::= { dot3StatsEntry 13 }Transmission MIB Working Group                                 [Page 14]