Yesterday, I quoth: > 2. There appear to be a few things that only seem to work on the main link, > not the backup link (unless I'm missing something). Register requests (maybe > only some types?) seem to be one of them, and I'm dubious about the DC sync > behaviour as well -- I don't think the RMW broadcast sync to the refclock is > really going to work on a link that doesn't contain the refclock. The > transmission delay measurements seem incorrect too.
As an example of this, here are some excerpts of "ethercat slaves -v" in various states with two slaves. This is a "normal" chain network -- backup link not connected: === Master 0, Slave 0 === Device: Main Distributed clocks: yes, 64 bit DC system time transmission delay: 0 ns Port Type Link Loop Signal NextSlave RxTime [ns] Diff [ns] NextDc [ns] 0 MII up open yes - 114873362 0 0 1 MII up open yes 1 114874642 1280 640 === Master 0, Slave 1 === Device: Main Distributed clocks: yes, 64 bit DC system time transmission delay: 640 ns Port Type Link Loop Signal NextSlave RxTime [ns] Diff [ns] NextDc [ns] 0 MII up open yes 0 644914350 0 640 1 MII down closed no - - - - This is exactly the same network with the backup link connected but not needed (no break in the main network): === Master 0, Slave 0 === Device: Main Distributed clocks: yes, 64 bit DC system time transmission delay: 0 ns Port Type Link Loop Signal NextSlave RxTime [ns] Diff [ns] NextDc [ns] 0 MII up open yes - 3165080514 0 0 1 MII up open yes 1 114874642 1244761424 622380712 === Master 0, Slave 1 === Device: Main Distributed clocks: yes, 64 bit DC system time transmission delay: 622380712 ns Port Type Link Loop Signal NextSlave RxTime [ns] Diff [ns] NextDc [ns] 0 MII up open yes 0 3692590109 0 622380712 1 MII up open yes - 1829843904 2432221091 0 And here it is with a break between the two slaves: === Master 0, Slave 0 === Device: Main Distributed clocks: yes, 64 bit DC system time transmission delay: 0 ns Port Type Link Loop Signal NextSlave RxTime [ns] Diff [ns] NextDc [ns] 0 MII up open yes - 4023995730 0 0 1 MII down closed no - - - - === Master 0, Slave 1 === Device: Backup Distributed clocks: yes, 64 bit DC system time transmission delay: 0 ns Port Type Link Loop Signal NextSlave RxTime [ns] Diff [ns] NextDc [ns] 0 MII down closed no - - - - 1 MII up open yes - 519954610 1122331797 0 Possibly some of this is related to the weird linked-but-not-linked behaviour when the backup link is connected but unneeded (described in my prior email). _______________________________________________ etherlab-users mailing list etherlab-users@etherlab.org http://lists.etherlab.org/mailman/listinfo/etherlab-users
