1.15 Optional Device Features
126 Feature Guide
PBX simple control over other equipment, allowing an extension user to, for example, activate an alarm from
his extension.
If the relay cannot be accessed (for example, because use is not permitted by COS, or the port is not in
service), a reorder tone will be heard at the extension.
Conditions
• Hardware Requirement: An external relay device and the DPH card
• The port of the DPH4 card to which the relay is connected must be assigned through system
programming as a relay port (not a door opener port).
• Some devices may be unable to communicate correctly with the PBX. Confirm compatibility with the
manufacturer of a device before installing it.
• Each external relay port has a COS assigned. This and the COS of an extension determine the
extension users who can use External Relay Control.
• The length of time that a relay is turned on can be specified separately for each relay through system
programming.
• If the same or another extension tries to access an external relay that has already been switched on,
the timer for that relay is reset.
Installation Manual References
2.5.1 DPH4 Card
2.8.1 Connection of Doorphones, Door Openers, External Sensors, and External Relays
Feature Guide References
2.2.1 Class of Service (COS)
User Manual References
1.9.2 External Relay
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