TNETX3150 datasheet(82/113 Pages) TI1

82 / 113 page

TNETX3150/TNETX3150A

ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

glossary (continued)

RX and TX frames 1024–1518

The total number of packets (including bad packets) received and transmitted that were between 1024 and 1518

octets in length inclusive (excluding framing bits but including FCS octets). If the LONG bit is set, this statistic

counts frames that are between 1024 and 1536 octets in length inclusive (excluding framing bits but including

FCS octets).

RX CRC errors

A count of frames received on a particular interface that is an integral number of octets in length but does not

pass the FCS check

RX H/W errors

The function of this counter is performed by the filtered RX frames counter.

RX fragments

The total number of packets received that were less than 64 octets in length (excluding framing bits, but

including FCS octets) and had either a bad FCS with an integral number of octets (FCS error) or a bad FCS

with a non-integral number of octets (alignment error).

RX jabbers

The total number of packets received that were longer than 1518 octets (excluding framing bits, but including

FCS octets), and had either a bad FCS with an integral number of octets (FCS error) or a bad FCS with a

non-integral number of octets (alignment error); 1536 octets if SYSCTRL option bit LONG is set.

RX octets

This contains a count of data and padding octets in frames that were successfully received. This does not

include octets in frames received with frame-too-long, FCS, length or alignment errors. (IEEE Std 802.3

Supplements, Layer Management (section 5) 5.2.2.1.3, number 2).

RX overruns port (00–14)

The number of frames lost due to a lack of resources during frame reception. This counter is incremented when

frame data cannot enter the RX FIFO for whatever reason. Frames that overrun after entering the FIFO also

can be counted as RX discards if they are not cut-through.

single-collision TX frames

A count of successfully transmitted frames on a particular interface for which transmission is inhibited by exactly

one collision

signal quality error (SQE) test errors

A count of times that the SQE test error is generated by the PHY layer for a particular interface. The SQE test

error is defined in section 7.2.2.2.4 of ANSI/IEEE Std 802.3-1985 and its generation in 7.2.4.6 of the same

document.

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