Ericsson EDACS M-RK I, Руководство оператора, Страница: 29 / 76

Clear Modes
Aegis clear and Voice Guard clear modes are identi-
cal voice modes in which the radio transmits and receives
only clear (analog) voice signals. These analog signals
are non-digitized and non-encrypted. Clear mode trans-
missions can be easily monitored by unauthorized per-
sons. Groups or channels programmed for clear opera-
tion cannot transmit or receive Aegis digital or private
messages.
Aegis Digital Mode
Aegis digital mode allows the radio to transmit and
receive digitized voice signals. Aegis digital signals pro-
vide improved weak signal performance and they cannot
be easily monitored with a standard receiver. Groups and
channels programmed for Aegis digital operation trans-
mit only digital signals. Private calls cannot be received
or transmitted when the radio is in the Aegis digital mode
because the radio does not know the cryptographic key
used. Message trunked group calls and individual calls
will be answered back in the mode they were received,
assuming the call or hangtime is still active. Individual,
phone, all and emergency calls will be transmitted clear
if digital mode is disabled or inoperative.
1. If receiving an analog message trunked call, the radio
will respond in analog mode during the hang time on
the working channel.
2. If receiving an analog I-Call, the radio will respond in
analog mode during the hang time.
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