1.15 Optional Device Features
128 Feature Guide
• 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.
Connection References
2.6.1 OPB3 Card
2.6.3 EIO4 Card
2.9.1 Connection of Doorphones, Door Openers, External Sensors, and External Relays
Feature References
2.2.1 Class of Service (COS)
Operation References
1.9.2 External Relay
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