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What is APCO "explicit mode"?

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kikito

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I found this on the trunked system info area of this site:

Infrastructure Version 6.2:

Adds improved (APCO "explicit mode") support for VHF/UHF P25 trunking, 700 MHz
 

franco

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"Explicit mode" is where transmit and receive frequencies are sent separately in the messages to the trunked radios, similar to as is done in Motorola VHF and UHF 3600 trunking systems. "Implicit" mode for P25 is similar to Motorola 800 MHz trunking where a channel number is sent over-the-air and a fixed transmit offset is always used.

Explicit is more flexible in that the system is not constrained to the small number (only 16) of fixed T-R offsets available. Implicit allows for better control channel efficienty as the messages are much shorter than the equivalent Explicit message.
 
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