The Alpha Communications® PM904 Mini Control Unit with Cabinet is designed to provide 'no phone line capability' when interfaced with the Alpha Communications® TE903NP, TE904NP or DPH100W (concierge/guard) master/phone stations, up to a maximum of 48 telephones (using up to 4 of the RY912 Relay Boards).
For 'no phone line' service capability include all of the required components of a standard Telephone Entry System, plus: a PM904 Control Unit, RY912 Relay Boards (1 per 12 lines/telephones-max. 4 per PM904), and a CT925 Connector Cable Assembly (1 per RY912). All equipment should be located in the telephone room. Local phone company shall provide the required RJ71C (12 line) interface jack(s) required.