About the Toshiba PIOU-2 Option Interface with 4 Zone Paging Card The Toshiba PIOU-2 Circuit card (Options Interface Unit) provides interfaces for features such as paging (Amplified, unamplified and zone), SMDR, terminal/modem interface for on or off-site maintenance, an alarm sensor and a Remote Maintenance Modem subassembly (IMDU). 1 to 3 per system. It occupies one card slot in any phone cabinet. This is for the Toshiba Strata DK280, DK424, DK16, DK40, DK40i or other Toshiba digital phone systems.
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