Installation guide

Installation 23
Synapse Installation Guide
If your OHP is single-zone, you will have to decide whether it requires an FXS connection or an AUX OUT connection. You can
only connect a multi-zone OHP to an ATA FXS port, i.e. a multi-zone OHP system cannot be connected to the AUX OUT port.
Equipment that can interface with the AUX OUT jack can be “dumb” in its audio output. It doesn't require any exchange of signals
to be ready to broadcast.
Equipment that uses an FXS port must be able to go on and off hook, because the FXS ports use telephone signals to exchange
information. The OHP generally includes some sort of controller or telephone interface, which often requires setting up, for
example, “PABX loop start trunk port access”, or “RJ-11 for Tip and Ring connections”.
To install an OHP system, see “Connecting an Overhead Paging System (OHP)” on page 55. There are three possible OHP
configurations.
Single-Zone Paging
Single-zone paging means that all speakers connected to the OHP system are activated together (that is, they are in the same
zone).
Single-Zone OHP equipment connected to the AUX OUT jack:
Use this configuration to connect single-zone paging
equipment that uses a 3.5 mm audio jack as input. For
example, use this configuration if the OHP device is just
an amplified speaker. See Figure 42 on page 56 for
connection details. Verify that the OHP input levels are
compatible with ATA level. See “Appendix A: Technical
Specifications” on page 202. Only single-zone paging is
supported in this configuration.
Even though the OHP has no RJ-11 jack, it may still have a Tip/Ring interface, requiring hard wiring. Whenever possible,
try both the AUX OUT jack and an FXS port to find the best configuration for your needs.
Figure 9. Single-Zone Overhead Paging on AUX OUT Jack