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Appendix B: Understanding the Physical Connections
The console headset is physically connected to the Avtec Jack Box. The NENA desk phone is physically connected to the
Hardware Media Workstation using one of the available AP Type II ports.
Scout Console Media Workstation (SCMW) AP Type II Port
On the console side, the cable should have an RJ45 connector. The following block diagram details the functional wiring
system.
When telephone calls are answered on an E911 phone set, a line pad representing the desk phone on the Scout
console’s screen automatically goes from the Disconnect state to the Select state. If the dispatcher is on a different
screen than the screen that the E911 line pad is on, the console automatically changes to that screen so the line pad in
the Select state is visible to the dispatcher.
Once the line is in Select, pressing PTT switches the headset transmit audio to the selected radio and temporarily mutes
the audio to the desk phone. The dispatcher has the option to place the line in Unselect, put the line on Hold or in Mute,
or place the line in a patch using the console's normal operations.
When the call is over, the dispatcher hangs up the E911 deskset which automatically places the pad representing the
phone set in the Disconnect state.
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NENA/Deskset for Hardware Media Workstation
| November 2020 | Revision 8
