GTN 625/635/650 TSO Installation Manual 190-01004-02Page 5-16 Rev. F5.2.5 Ethernet (HSDB)The Ethernet-based HSDB (High Speed Data Bus) meets the hardware aspects of IEEE standard 802.3 for10 base T Ethernet communications.5.2.6 Main Audio OutputThe main audio output is used to play the ‘clicks’ associated with the touch screen, as well as TAWS/HTAWS alerts on GTN units that are equipped with TAWS/HTAWS.The audio output will be 60 mW across a 500Ω load.5.2.7 Main Indicator5.2.7.1 Main Indicator FunctionThe Main Indicator displays both lateral and vertical deviation from selected course, To/From indications,lateral and vertical flags and superflags.The “CDI” key on the screen of the GTN takes the place of remote “NAV/GPS” switches, and is used totoggle between display of GPS and VOR/ILS navigation on a remote indicator. The navigation source isannunciated on the display below the ‘CDI’ key. The navigation method is optionally annunciatedexternally by connecting to the VLOC ANNUNCIATE output (P1001-52) and GPS ANNUNCIATEoutput (P1001-15). GPS and VOR/ILS navigation may be toggled externally when the CDI SOURCESELECT input (P1001-39) is momentarily grounded. See Section 5.2.9 and Section 5.2.10 for moreinformation on the discrete inputs and outputs.An OBS resolver connection to the GPS is preferred, but not required. For the GTN 650, an OBS resolvertypically is connected to the MAIN OBS inputs for use with the VOR receiver.Pin Name Connector Pin I/OETHERNET OUT 1 A P1002 8 OutETHERNET OUT 1 B P1002 9 OutETHERNET IN 1 A P1002 6 InETHERNET IN 1 B P1002 7 InETHERNET OUT 2 A P1002 17 OutETHERNET OUT 2 B P1002 18 OutETHERNET IN 2 A P1002 15 InETHERNET IN 2 B P1002 16 InETHERNET OUT 3 A P1002 25 OutETHERNET OUT 3 B P1002 26 OutETHERNET IN 3 A P1002 23 InETHERNET IN 3 B P1002 24 InETHERNET OUT 4 A P1002 4 OutETHERNET OUT 4 B P1002 5 OutETHERNET IN 4 A P1002 13 InETHERNET IN 4 B P1002 14 InPin Name Connector Pin I/OAUDIO OUT HI P1001 4 OutAUDIO OUT LO P1001 23 Out
