[Info-vax] Loosing all LAT connections (More answered questions)

[H Vlems]

On 17 apr, 17:09, JCamCMKRNL <jcam90... at earthlink.net> wrote:
> First, thanks to all who have responded. Your information has been
[snip 1]
> This is clean except some send failures/collisions:
> Known Line Counters as of 17-APR-2009 06:31:45
>
> Line = ISA-0
>
>       >65534  Seconds since last zeroed
>      1691897  Data blocks received
>        25491  Multicast blocks received
>            0  Receive failure
>     78211496  Bytes received
>      1529460  Multicast bytes received
>            0  Data overrun
>      2240057  Data blocks sent
>        37989  Multicast blocks sent
>           87  Blocks sent, multiple collisions
>          102  Blocks sent, single collision
>         1173  Blocks sent, initially deferred
>    107990422  Bytes sent
>      1729968  Multicast bytes sent
>         8030  Send failure, including:
>                 Carrier check failed
>         8030  Collision detect check failure
>            0  Unrecognized frame destination
>            0  System buffer unavailable
>            0  User buffer unavailable
>
[snip 2]
> We have had hundreds of Monkeys using this network for about 30 years.
> So far no sign of intelligence.
> ==========================
> Thanks again for all of your input.
>
> Jeff Cameron

Jeff, the number of collision detect check failures is rather high. It
may be that one ore more 10BASE5 terminators are causing problems.
Either the cable is too long or a terminator is not grounded properly
or the yellow cable is not grounded at all and one of the terminators
got connected to something that did carry a potential. Isolation tape
on the terminators may be helpful. You can run ethernet outside its
specifications without encountering too many problems, providing the
load is low (<< 10%) and the protocol robust. Both DECnet and LAT are
robust, if a packet fails to arrive properly it is retransmitted. But
the retransmit interval for LAT is a lot shorter than with DECnet.
Which is good for reponse but makes it quick to fail. As others have
mentioned, LAT is a very good indicator for problems on the network.
Hans