Clear-Com Tempest900 - Manual (Page 66)

60 Tempest®900 2-Channel Wireless Intercom System
Accu-Sync
Three BaseStations Accu-Synced
Accu-Sync provides a common timing signal between connected BaseStations. This signal ensures that transmission cycles
for all Accu-Synced BaseStations occur simultaneously. This synchronized transmission eliminates the negative RF effect
called desensing. See the following section, “Special RF Considerations for Multiple BaseStations,” for more information
on connecting multiple BaseStations.
When two or more Tempest BaseStations are to be operated in the same location, connecting the BaseStations via the
BaseSync connector on the back of the BaseStation, minimizes potential RF interference between BaseStations. The more
BaseStations there are in close proximity to each other, the more important it is to use Accu-Sync.
One BaseStation must always act as the sync source when using Accu-Sync. The sync source is any BaseStation that does
not have a BaseSync cable plugged into the BaseSync IN connector. Always ensure that one, and only one BaseStation has
an open (no connection) BaseSync IN connector.
When a BaseStation does not have a BaseSync cable plugged into the BaseSync IN connector, that BaseStation uses an
internally generated timing pulse to control its own transmission cycle.
When a BaseStation has a BaseSync cable plugged into the BaseSync IN connector, that BaseStation uses the external sync
signal (timing pulse) to control its transmission cycle.
The BaseSync cable is a DE-9F To DE-9M wired straight through on pins 1-5. The maximum distance a BaseSync cable can
be is 1,500 feet (457.2 m).
BASESYNC IN
Accu-Sync - DE-9 Connector
Never connect Accu-Sync cables between 2.4GHZ and 900MHz Tempest models.