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In the case illustrated in figure 8.3, the top line of the normal status display shows “IL” (where the “I” indicates that
the unit is isolated from a time reference, and the “L” indicates that the Ethernet interface is listening for a
connection).
An EtherSpaceLink Absolute Time Interface (ATI) that synchronises time-tags to an IRIG-B00x source is available
from 4Links. It should be included as one of the units in the chain above. If there is an ATI in the chain, it is, by
default, the synchronisation master. All other EtherSpaceLink units should then be set to “Synchronise to
reference”.