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520 Brochure (download pdf)

520 Specifications (download pdf)

520 System Data (download pdf)

Data Sheets (download pdf)

• Master Handset with Membrane Keypad
• Analog/Digital Line Card Module
• Network Hub
• Analog Line Card Module
• Digital Line Card
• PBX Telephone Interface
• Power Supply
• Administrative Master
• Central Control
• Handset with Hookswitch and Call Button
• Call-In Switch
• Call-In Switch
• Central Equipment Enclosures
• Secondary Clock Interface
• Direct-Select Console
• Console Extender
• Administrative Master