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2.3.12 Headset Jacks <br /> The VPM is capable of supporting up to two headset jacks.A headset jack allows a dispatch console <br /> user to use a headset while operating the dispatch console. The headset jack supports headsets that use <br /> either PJ7(6-wire)or PJ327(4-wire)long frame connectors.6-wire headsets have a PTT button while <br /> 4-wire headsets do not have a PTT button.The headset jacks ship from the factory configured for 6- <br /> wire headsets. If 4-wire operation is desired,changes must be made inside the headset jack box <br /> depending on the version of the headset box. <br /> Figure 2-8:Headset Jack <br /> The headset jack contains two volume controls: <br /> • For adjusting the level of received radio audio <br /> • For adjusting the level of received telephone audio <br /> A small dimple is molded into the headset jack housing near the telephone volume control so a <br /> dispatch console user can tell them apart without having to look at them.The headset jack allows <br /> users to use headsets,which both decreases the ambient noise in a control room and reduces the effect <br /> of any ambient noise on dispatch console transmissions. This improves the quality of the audio being <br /> transmitted from the control room and allows the dispatch console users to hear received audio more <br /> clearly. <br /> When a headset is plugged into a headset jack,the selected receive audio is typically removed from <br /> the speaker(s)and routed to the headset earpiece. <br /> If a telephone set connected to a dispatch console external telephone port is taken off hook while a <br /> headset is connected to a dispatch console,the selected radio audio is removed from the headset <br /> earpiece and routed to the appropriate speaker(s). The received telephone audio is routed to the <br /> headset earpiece.The headset microphone becomes live and its audio is routed to the external <br /> telephone set.This allows a dispatch console user to talk and listen on the telephone set in a hands- <br /> free full-duplex mode. <br /> Orange County,North Carolina <br /> MCC 7500 Console System Use or disclosure of this proposal is subject <br /> to the restrictions on the cover page. <br /> ® Motorola Solutions Confidential Restricted System Description 2-11 <br />