Any EtherLynx camera being used as a primary FinishLynx capture device: must: be equipped with the 5LTE Timing Option. EtherLynx cameras will still produce high-resolution photo finish images even without the Timer-Enabled option. But because the non-Timing images are not time-stamped, they can only be used as a visual backup for a primary, Timing-Enabled camera. We usually recommend that additional cameras be equipped with Timing, just in case.
Some users may buy an additional, non-timing EtherLynx camera that functions as a reverse-angle backup device. But often they will also add the 5LTE upgrade to any additional cameras so they can provide fully-redundant, reverse-angle backup results (in case of a last-minute power failure, network issue, or weather incident). : More importantly, any additional cameras equipped with the Timing-Enabled option can also function as primary capture devices at other splits or finish lines throughout the venue.
