816

PROGRAM MODULE microprocessor-controlled electronic key telephone system designed for small-to-medium businesses - Capacity: The "816" designation signifies that the system's baseline Key Service Unit (KSU) is built to support up to 8 central office (CO) phone lines and 16 individual station extensions.Architecture: The core brain relies on a Z-80 microprocessor architecture, utilizing a combination of factory ROM and battery-backed RAM to hold user custom settings (like speed dials or extension routing)