Designed to address a variety of apartment entry applications, Viking C-3000 Entry System provides secure multi-tenant building access, without the need for CO lines; the only requirement is that each tenant have a touch-tone telephone set wired to their apartment. Conversely, the C-3000 performs equally as well in installations where CO lines are present. An individual C-3000 module has a 12-tenant capacity; for larger applications, a maximum of eight (8) C-3000 modules can be interconnected, allowing a total system capacity of up to 96 tenants. A C-3000 system consists of at least one Master C-3000 module, and as many as seven Slave modules.