PATENT 8 to 248 Zone Master Intercom Panel

• Master panel from 8 zone to 248 zones, in steps of 8 zones
• Panel configuration:
  • Master Handset Module (MHS)
  • Handset Zone Selector Switch and Status Indicator (Call, Fault)
  • Common Trouble Indicator
  • Charger & Batter
• Each Handset Zone Selector Module controls up to 8 remote handset stations (RHS)
• Zone control switch with in-built LEDs (Call, Fault Indicator) save space
• Each Transponder unit (Supervisory termination module) connects up to 8 RHS
• Transponder unit can be mounted in master panel for small zone handset panel
• Transponder unit can also be mounted in a distributed network system for many zone handset panel to save wiring cost
• Easy operation to make a call to RHS by picking up MHS and pressing respective Handset Zone Selector call switches
• Call/Busy at Remote Handset to show status of Master Handset
• Visual indicator at RHS to indicate call signal from MHS (Option)
• All Party / Private selection to make conference talk or private talk
• Only 3 pairs of wire between transponders. All outgoing wires between transponders and from transponder units to RHS are monitored
• Interface circuit to Voice Recorder & Fire Alarm system
• Plug-in RHS module for mobility
• Built-in circuit protection against high voltage surges
• Fully monitored against AC failure, charger and battery faults
• Audio visual indicators are provided to monitor critical component failures 
• Designed to comply with Singapore Standard SS 546 : 2009