
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010
Page 2-14
Rev. 29, Sept. 2021
2.7
Telecommunications interface
The PAC24 has interface capability with some cellular telephone systems (visit
details). It is the user’s responsibility to determine the appropriate legal use of the equipment, and provide the equip-
ment and services.
As installed in the standard configuration, the PAC24 Com 5 function operates conventionally. Pushing the Com 5 Xmt
button places the receive audio from Com 5 in the headset and applies the pilot or copilot microphone to the Com 5
when the appropriate PTT is activated.
If telephone mode is selected by the internal DIP switch, (S4 Switch 4, see §2.3.2.9) the PAC24 is forced into Com 5-
Duplex mode. This mode is designed to operate with telecommunications systems. Intercom Audio streams are provid-
ed to the COM 5 output, the PTT for Com 5 is inactive, and audio from Com 5 is presented to the headset. This allows
a telephone-like audio interface. The COM 5 input and output is compatible with aviation radios.
In a DUAL Audio Panel installation, the telephone mic audio input should be connected to the both audio panels COM
5 Mic output (J3 pin only).
PS Engineering makes no expressed or implied warranty that the equipment will be compatible with any devices. For a
list of tested devices, visit
Unauthorized use of cellular telephone devices in aircraft is subject to FCC enforcement action,
which may include a $10,000 fine per incident. PS Engineering, Inc. does not endorse using unap-
proved cellular telephone equipment in flight, and takes no responsibility for the user’s action.
1/8" Cellular Jack
COM 5 Mic Input
Com 5 Audio
Audio Lo
R
6
c
PAC24 Connector
Cellular Plug (ty pical)
Tip= Microphone out
Ring= Speaker audio
Base=Ground
For Duplex (cell phone) operation
Internal DIP Switch SW5, switch 4 must be turned on
This is a typical interconnect
PS Engineering does not guarantee compatability in all cases.
Cellular Phone
Interconnect