The talk set works by digitizing your speech, transmitting it and reassembling it at the remote end; similar to your CD player. Why do it this way? By using the digital capability of the DSP-4000 Series, we can transmit voice over copper AND fiber.
Copper
To transmit voice over copper, the DSP-4000 Series requires two pairs to be connected. They do not have to be wire mapped correctly. The following link would support full duplex communication.
Figure 1. Wiremap example
Full duplex means that the user can talk and listen at the same time. It is not like a radio handset where you have to wait for the other person to finish speaking before you can speak. You cannot use the talk set during an Autotest.
Fiber
To transmit voice over fiber, the DSP-4000 Series requires both fibers to be connected correctly.
Headphones (Earphone / Headset)
The headsets are standard. The ones you use in your office or on a mobile phone can be used so long as the plug is a 2.5mm Stereo Plug (3 contact), right angle or straight is acceptable. Figure 2 below shows the pin layout.
Figure 2. Pin assignment for talk set/headset
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