iNS/iDS 2-Wire System Manual
350-077
Rev. D - 1/20/2021
Page 107 of 107
18.
Fail Safety
The iNS2 and iCCU include fail safety operation that will automatically lock in a call when the following conditions arise:
1. If an iNS2 has been connected to an iCCU and assigned a phase, but the iCCU can no longer see it (e.g.
knockdown or communication problem), the iCCU will place calls for the associated phase.
2. If an iNS2 is connected to the iCCU but not yet assigned to a phase, the iCCU will place calls on all phases.
3. If an iNS2 is in maintenance mode, a call will be placed on the associated phase. This can be achieved by
explicitly placing the button into maintenance mode, enabling audio playback from within the Apps, or performing
a firmware update.
4. If an iCCU is in maintenance mode, a call will be placed on all phases.
5. The iCCU-S2 will place calls over the hard-wired connection when they are not powered.
6. The iCCU-S2 will place calls over the hard-wired connection if operating in hybrid mode (obtaining ped intervals
over SDLC), if the SDLC cable becomes disconnected.
19.
Regulatory Notice
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy, and if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try
to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.