Clear Modes; Aegis Digital Mode - Ericsson EDACS ORION Operator's Manual

Conventional Aegis or encrypted channels require Channel Guard on
the channel to operate correctly.

CLEAR MODES

Aegis clear and Voice Guard clear modes are identical voice modes in which
the radio transmits and receives only clear (analog) voice signals. These ana-
log signals are non-digitized and non-encrypted. Clear mode transmissions
can be easily monitored by unauthorized persons. Groups or channels pro-
grammed for clear operation cannot transmit or receive Aegis digital or pri-
vate messages.

AEGIS DIGITAL MODE

Aegis digital mode allows the radio to transmit and receive digitized voice
signals. Aegis digital signals provide improved weak signal performance and
they cannot be easily monitored with a standard receiver. Groups and chan-
nels programmed for Aegis digital operation transmit 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 hang time 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 dur-
ing the hang time.
3. When using the "WHC" feature to respond to an I-Call (after the hang
time has expired), the call will be transmitted in the mode defined by the
system mode as programmed for the current system if the ID being
called is not in the I-Call list. If the ID is in the I-Call list, then the call
will be transmitted as defined by the I-Call mode programmed in the list
for that ID.
46
NOTE