Garmin GDL 59 – Data Logger & Wi-Fi Datalink Installation Manual - Page 28

4.4.4 Handset POTS (Plain Old Telephone Service) Input/Output The POTS interface shall: 1) Be capable of detecting a hook-switch flash signal where the on-hook time is 200ms. 2) Be capable of detecting an on-hook condition where on-hook is represented by a load of 10K Ω or greater between the tip and ring leads. 3) Deliver an on-hook voltage between -42 and -56 VDC into a 1M Ω or greater load. 4) Be capable of delivering a power ring signal with a frequency between 15 Hz and 68 Hz and amplitude between 40 and 120 Vrms into a 2.3K Ω +/- 10% load. 5) Maintain a source current of 25mA +/- 5% into an off-hook load. Up to two analog POTS handsets may be connected to these lines. Pin Name POTS HANDSET RING POTS HANDSET TIP Connector Pin I/O P591 59 I/O P591 78 I/O 4.5 Audio Connections 4.5.1 Iridium Audio Channels The Iridium Audio channels interface with the GSR 56 units. See Appendix B for sample interconnect drawing. Pin Name IRIDIUM AUDIO IN 1 HI IRIDIUM AUDIO IN 1 LO IRIDIUM AUDIO OUT 1 HI IRIDIUM AUDIO OUT 1 LO IRIDIUM AUDIO IN 2 HI IRIDIUM AUDIO IN 2 LO IRIDIUM AUDIO OUT 2 HI IRIDIUM AUDIO OUT 2 LO Connector Pin I/O P591 15 In P591 34 In P591 16 Out P591 35 Out P591 13 In P591 32 In P591 14 Out P591 33 Out 4.5.2 Audio System Channels The Audio System channels connect to other LRUs, such as the GMA Audio Panel. Pin Name AUDIO SYSTEM 1 AUDIO IN HI AUDIO SYSTEM 1 AUDIO IN LO AUDIO SYSTEM 1 AUDIO OUT HI AUDIO SYSTEM 1 AUDIO OUT LO AUDIO SYSTEM 2 AUDIO IN HI AUDIO SYSTEM 2 AUDIO IN LO AUDIO SYSTEM 2 AUDIO OUT HI AUDIO SYSTEM 2 AUDIO OUT LO Connector Pin I/O P591 19 In P591 38 In P591 20 Out P591 39 Out P591 17 In P591 36 In P591 18 Out P591 37 Out NOTE For best noise immunity, it is recommended to connect AUDIO SYTEM 2 AUDIO OUT (pins 18 and 37) to a differential input only. Page 4-6 Revision C GDL 59 Installation Manual 190-00837-00