19 Dec
2024
19 Dec
'24
4:41 p.m.
Collision check test is, if I remember right, a feature that wasn't in the Ethernet
spec but got added by IEEE 802.3. So old transceivers may not have it. In spite of what
the event says, it's not a send failure because the SQE test signal occurs right after
the packet is finished. If you have such a transceiver, you may want to look into
disabling the check. Failing that, turn off the event.
If the transceiver does have SQE, then its failure might be due to a cable problem. Check
the Ethernet cable. It needs to be terminated at both ends and nowhere else :-) and it
needs to be grounded at exactly one point.
paul
On Dec 19, 2024, at 5:15 PM, Warner Losh via cctalk
<cctalk(a)classiccmp.org> wrote:
It's always SQE with thicknet. Too much or too little.
On Thu, Dec 19, 2024, 3:03 PM Peter Ekstrom via cctalk <
cctalk(a)classiccmp.org> wrote:
> I just learned what SQE does. I had to enable it on my AUI and it seems the
> collision detection is happy now.
>
> -Peter
>
> On Thu, Dec 19, 2024 at 9:41 AM Peter Ekstrom <epekstrom(a)gmail.com> wrote:
>
>> Hi all,
>>
>> This may be a dumb question but I am a bit stumped. I can't seem to find
>> any helpful info in the manuals. I have a DEQNA installed in my 11/23+
> and
>> I have run a NETGEN using the QNA driver. When NETINS runs I start seeing
>> messages like these on the console:
>>
>> Event type 5.14, Send failed
>> Occurred 19-DEC-24 09:30:11 on node 10.1 (TYCHO)
>> Line QNA-0
>> Failure reason = Collision detect check failed
>>
>> So obviously the link isn't working, but I find nothing helpful about
>> where to start looking regarding the failed collision detect check. The
>> line is on:
>>
>> NCP>show line qna-0 status
>>
>> Line status as of 19-DEC-24 09:36:31
>>
>> Line State
>>
>> QNA-0 On
>>
>> I have an Ethernet transceiver (I have 2 and have tried both, they worked
>> last time I used them) connected to the DEQNA harness, and a cable
>> connecting it to an old 10Base-T hub. I know that hub works because I
> have
>> a couple of other systems (OS/2 laptop and an AS/400) connected to it.
>>
>> So does anyone have any ideas of where I can start?
>>
>> Thanks in advance!
>> Peter
>>
>