TC-20M

The Aiphone TC-20M is a desktop/wall-mount master station for the TC-M Series internal telephone-type intercom system, handling calls from up to 20 TB-SE handset sub-stations or IE/IF door stations with full-duplex handset communication.
It features individual station selector buttons with call-in LEDs (stay lit until answered), selective/group/all-call capabilities, and transfer functions between sub-stations, expandable to 60 stations via TC-20G/TC-40G add-on selectors.
Key Specifications
Feature
Specification
Capacity
20 stations (expandable to 60) 
Communication
Handset full-duplex ​
Power
18V DC/350mA or 15V AC/750mA via PS-18C/E ​
Controls
Station select buttons, tone volume, handset volume ​
Wiring
2-cond shielded (#822202) to TB-SE; 5/14-cond to doors ​
Dimensions
405 × 230 × 97 mm (16" × 9" × 3-13/16") ​
Weight
Approx. 3.5 kg ​
Mounting
Desk or wall mount ​