JK Audio Universal Host - Manual (Page 4)

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Features (continued)
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12. Handset Jack - Connect your telephone handset to this jack.
13. Phone Jack - Connect this jack to the handset jack on your
telephone using the supplied handset jumper cable.
14. Handset Type Selector Switch - Use this switch to select the
correct type of handset microphone that your telephone uses.
A=Electret, B=Carbon, C=Dynamic
15. Caller Output - Male balanced XLR output contains only the
caller’s voice.
16. Send 1 Input - Female balanced XLR input for audio going into
the phone line. Mic or line level input.
17. Mic / Line switch - Sets the front end sensitivity of the Send 1
XLR jack. Set to Mic if you intend to connect a dynamic
microphone directly to the Send 1 jack. Set to Line if you are
connecting to the output of a mic mixer.
18. USB port - for bi-directional audio connection to your computer
or other equipment.
19. Send 2 Mono Input - 3.5mm mono mini jack input for signals
going into the phone line. Line level.
20. Stereo Output - 3.5 mm stereo mini jack output contains Send
and Caller audio determined by the Send 1 and Send 2 levels
and the Caller level controls. Left channel contains your local
Send audio mixed with audio from the USB connector and
right channel contains the Caller's audio from the phone line.
21. Power Jack - For connection only to the supplied 9 VDC
regulated power supply only.
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Block Diagram