[. . . ] Connections to the EAI card are typically accessed via two 26-pin terminal block modules mounted inside the system's control cabinet. A ribbon cable connects each terminal block module to the rear of the card rack housing the EAI card. Audio Inputs The 600-ohm audio input 1, 600-ohm audio input 2, 600-ohm audio input 3, and 600-ohm audio input 4 provide four audio inputs to the system. These inputs may be independently routed to one of the following five card rack audio busses: evacuation, page resource 1, page resource 2, party line 1, or party line 2. [. . . ] Mohnton, PA 19540 USA 610-777-1374 800-492-1212 Fax: 610-796-5954 VISIT WWW. GAI-TRONICS. COM FOR PRODUCT LITERATURE AND MANUALS Model 69439-001 External Audio Interface Pub. DS69439-001 Page: 2 of 2 Specifications Electrical Board Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 575 mA maximum @ +5 V dc ±10% 150 mA maximum @ +12 V dc ±10% 150 mA maximum @ -12 V dc ±10% 1. 0 kHz Sine Wave Detectors NOTE: Use a card rack audio bus when measuring amplitude. In-range frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (within) inside 1. 00 kHz ±1% In-range amplitude on card rack audio bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . inside 4. 24 Vpp (1. 50 Vrms) ±1. 5 dB Out-of-range frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (beyond) outside 1. 00 kHz +3% Out-of-range amplitude on card rack audio bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . outside 4. 24 Vpp (1. 50 Vrms) ±4. 5 dB 600-Ohm Audio Input Audio input voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 82 Vpp (1. 00 Vrms) maximum Audio input to card rack audio path frequency response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 Hz to 12. 0 kHz ±1. 5 dB Audio input to card rack audio path distortion + noise. . . . . . . . . . . . . . . . . . . . . . . . . . . THD + noise <0. 5% @ 1. 00 kHz Audio input impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 k from 250 Hz to 12. 0 kHz Audio detect level for LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282 mVpp (100 mVrms) maximum Audio not detected threshold for LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28. 2 mVpp (10. 0 mVrms) minimum 600-Ohm Audio Output NOTE: Each audio output requires an external 600 load resistor for proper operation. Audio output voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 82 Vpp (1. 00 Vrms) ±1. 5 dB Card rack audio path to audio output frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 5. 0 k ±10% Environmental Temperature range (operating/storage). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +32° F to +122° F (0° C to +50° C) Relative humidity:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10­85% non-condensing Mechanical Unit dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]