CTI Products TSAM Transmitter Steering & Audio Matrix - Manual (Page 48)

TSAM Installation and Maintenance Rev. 2.10 Chapter 5
CTI Products, Inc. Setting Programmable Options
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5.5.2 Coded (Encrypted) TX operation
The TSAM unit supports Coded (encrypted) operation under the following conditions:
• The encryption and decryption must be done at the base stations.
• The base station automatically passes clear or decrypted audio as appropriate.
• The base station audio control lines must always pass clear audio.
• The base station TX mode is selected by either a specific control tone or is controlled by
Motorola's Positive Mode Control (PMC) dual function-tone method.
• The comparator that the customer purchases must vote properly on encrypted and decrypted
audio.
• The console provides a Coded/Clear output to the TSAM for desired TX mode.
The TSAM only controls the control tones for the TX mode (coded/clear). It does not provide any
digitizing, encryption, or decryption of the transmit or receive signals.
Encrypted Systems Warning:
The reconstructed audio of a digital system may have different audio noise
characteristics than a standard analog receiver system. This may cause an analog
voter to mis-vote, or at least vote the reconstructed digital signals differently than it
does normal analog signals.
The customer must be sure that the comparator system will vote the proper site
when it is receiving a coded (and decrypted) signal.
There are 3 choices for Coded TX operation:
• Positive Mode Control
• Single Function Tone Coded Control
• No Coded Support
Most users will choose No Coded Support
Select Coded (Encrypted) TX operation:
P Positive Mode Control (PMC - Dual function tone)
Supports Main & Secondary
S Single Function Tone Coded Control
Supports Main Only
F1=Clear Keying; FCoded=Coded Keying
N No Coded Support
(P/S/N)? --> (N) N : N