20 Dec
2024
20 Dec
'24
11:15 a.m.
Collision detect check failure is a warning, not a send failure -- the message is
misleading There are several possible causes.
1. The transceiver predates SQE check, it doesn't implement the signal. If so, turn
off the message, you're fine.
2. The transceiver can do SQE but it's turned off. Turn it on.
3. The collision signal circuitry in the transceiver is broken. Or the collision wires in
the transceiver cable are. If so, on a half-duplex link with several other stations on it
all busy talking, you might see lost packets, and the other stations would likely be
reporting "late collision" errors. If so, replace the cable or transceiver.
I'm not sure if a bad coax segment (not properly terminated or damaged cable) can do
this, or if it would only cause false collision signals which is a different message.
BTW, in all these cases you're probably communicating just fine. For 1 and 2, no one
else would be reporting any errors. Also: if your collision counts are non-zero it's
not #3.
paul
On Dec 19, 2024, at 9:41 AM, Peter Ekstrom via cctalk
<cctalk(a)classiccmp.org> 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