Model 920 Ethernet Data Multiplexer Manual
Focal Technologies Corporation
Page 2-5
A Moog Inc. Company
920-0603-00 Rev K
2.1.5 Ethernet Link Synchronization
For Ethernet Channels 1 through 3, the Ethernet link state is shared between a pair of 920-EDMs. In this way
if the Ethernet link is lost in the local or remote section of an Ethernet channel, the corresponding Ethernet link
on the opposing end of the system will be forced off to communicate to host electronics that the link has been
lost. Similarly, when the Ethernet achieves link, if the opposing end has been forced off in this channel from a
previous down-link condition, it is subsequently
‘released’ to allow the full end-to-end channel to come on-line.
For the EtherCAT channels (ports 1 and 2), the corresponding port on the near and far sides of the fiber link
will connect or disconnect within 40
s of each other. Ethernet port 3 will connect or disconnect within 1 s of the
corresponding port on the far side of the fiber link.
