The rack mount master station(s) shall be Alpha Communications® / Ring model AA903RK or approved equivalent. Master(s) shall have clear twoway communications. Master(s) shall feature a 12-button keypad, and shall require simple home-run wiring. Master(s) shall be rack mounted using a custom-supplied 19" (standard type) equipment rack. Contractor shall provide for adequate ventilation and electrical power, for all equipment mounted in the rack. Unit faceplate shall be a matte black painted aluminum.
Contractor shall observe all local and national electrical and building codes.
The AA903RK is designed for use as a rack-mounted unit, which will fit into a customer-supplied 19" (standard type) equipment rack.
The unit features a matte black painted aluminium frontplate with speaker and microphone for normal handsfree speech with a range of approximately 3-5 meters or 10-15 feet. Its keyboard section contains a warning lamp and 12 buttons plus a privacy switch, which also functions as a microphone cut-out switch when pressed during a conversation.
On the touch-dial keyboard, the left-hand T-button is provided for manual control of a conversation when desired. The X-button is used to cancel a call.
The station permits the connection of a parallel speaker where additional output is required (loudspeaker impedance 50 ohms recommended). The station is designed to work with the RM5000EX and/or CB901 series microprocessor intercom systems.
||Matte Black Painted Aluminum faceplate
||Width: 19.0" (483mm)
Height: 5.25" (134mm)
Depth: 1.50" (39mm) behind rack
24V DC+/- 20%
||300 - 5000 Hz
||0 dB (1 mW/600 ohm)
||normal -12 dBm
||max + 4dBm
||according to CCITT norms