Experimental Physics and
Industrial Control System

Rod Nussbaumer via Tech-talk <[email protected]> · Tue, 7 Jan 2020 19:54:49 +0000

The turn-around time between the second and third packets in this 
exchange is 0.5ms. Have you compared the timing on the system that does 
work? Device '00:00:af:00:03:ed' seems to take much longer to respond to 
the initial packet; about 53ms.

My thinking is that on a vintage device, that might be too soon for the 
device to ready itself to receive or properly handle the response. Are 
you able to add any delays in the timing to see if that has any remedial 
effect? I'm wondering if the increased speed has caused to to cross some 
threshold that makes it impossible for an older, slower device to keep up.

    ---   rod.

On 1/1/20 10:31 AM, Mark Rivers via Tech-talk wrote:
> 11:30:18.680030 3c:fd:fe:a3:f2:58 (oui Unknown) > 00:00:af:00:03:ed (oui 
> Unknown), 802.3, length 116: LLC, dsap SNAP (0xaa) Individual, ssap
> 
> SNAP (0xaa) Command, ctrl 0x03: oui Unknown (0x0000af), pid Unknown 
> (0x5034), length 108:

> 
> 11:30:18.733989 00:00:af:00:03:ed (oui Unknown) > 3c:fd:fe:a3:f2:58 (oui 
> Unknown), 802.3, length 80: LLC, dsap SNAP (0xaa) Individual, ssap S
> 
> NAP (0xaa) Command, ctrl 0x03: oui Unknown (0x0000af), pid Unknown 
> (0x5034), length 72:
> 

> 11:30:18.734415 3c:fd:fe:a3:f2:58 (oui Unknown) > 00:00:af:00:03:ed (oui 
> Unknown), 802.3, length 180: LLC, dsap SNAP (0xaa) Individual, ssap
> 
> SNAP (0xaa) Command, ctrl 0x03: oui Unknown (0x0000af), pid Unknown 
> (0x5034), length 172:
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System