•Tx Lost Carrier Sense

This counter contains the number of frames that were transmitted by the device despite the fact that it detected the de-assertion of Carrier Sense during the transmission.

•Tx Frames Deferred

This counter contains the number of frames that were deferred before transmission due to activity on the link. This is a normal condition in busy conditions, and the number can grow quite large.

•Tx OK with Single Collisions

This counter contains the number of transmitted frames that encountered one, and only one, collision before being successfully sent. This is a normal condition in busy conditions. If single collisions accumulate quickly, you may want to consider segmenting your network more. To combat collisions, the software can adjust the interframe gap to allow more room between frames. More room between frames allows more frames on average. Refer to the "CurrentIFSValue" section for more details.

•Tx OK with Multiple Collisions

This counter contains the number of transmitted frames that encountered more than one collision. This only gets incremented once, even though one frame may have had several collisions before being successfully sent. This is a normal condition in busy conditions. If multi-collisions accumulate quickly, you may want to consider segmenting your network more. To find the average number of multi- collisions a frame had to endure before being successful, use the following formula:

(TxTotalCollisions - TxSingle Collisions - TxMaxCollisions) / TxMultiple Collisions

If the average is close to 16 (the Ethernet max collisions before a frame will no longer be retried), then you will need to segment your network to avoid losing frames and network efficiency to collisions.

•Tx Total Collisions

This counter contains the total number of collisions that were encountered while attempting to transmit. This count includes late collisions and collisions from frames that encountered MAXCOL(16). If this counter is growing quickly, you need to segment your network more.

•Rx Good Frames

This counter contains the number of frames that were received properly from the link. It is updated only after the actual reception from the link is completed and all the data bytes are stored in memory.

•Rx Crc Errors

This counter contains the number of aligned frames discarded because of a CRC error. The CRC_ERRORS counter is mutually exclusive to the ALIGNMENT_ERRORS and SHORT_FRAMES counters. CRC errors are usually caused by late collisions where another station has sent data in the middle of a frame. This number should be very low.

•Rx Alignment Errors

This counter contains the number of frames that are both mis-aligned (not an even length) and contain a CRC error. The ALIGNMENT_ERRORS counter is mutually exclusive to the CRC_ERRORS and SHORT_FRAMES counters.

•Rx No Resource Errors

This counter contains the number of good frames discarded because there were no resources available. Frames intended for a host whose Receive Unit is in the "No Resources" state fall into this category. The number of resource errors can be reduced by increasing the number of receive buffers

Installation 36