Ericsson LBI-39012B - Manual (Page 23)

CLEAR MODES
In clear mode the radio transmits and receives only analog voice signals.
These analog signals are non-digitized and non-encrypted. Clear mode
transmissions can be easily monitored by unauthorized persons. Channels
programmed for clear operation cannot transmit or receive Aegis digital
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. Channels
programmed for Aegis digital operation transmit only digital signals.
Phone and emergency calls will be transmitted clear if digital mode is
disabled or inoperative.
DTMF
The overdial and hot keypad features for transmitting DTMF tones are not
available while in the Aegis Digital Mode.
AEGIS VGE DIGITAL MODES
The Aegis VGE digital mode allows the radio to transmit encrypted
messages and receive clear or digital transmissions. The radio will transmit
digital if the channel is programmed for digital operation and forced operation
is pre-programmed. If autoselect operation was pre- programmed and the radio
is in digital mode, the radio will transmit in the mode of the received call if the
hang time is active. If no hang time is active, the radio will transmit digital.
AEGIS transmissions cannot be received by a radio set to receive VGE
digital transmission. Accordingly, a VGE digital transmission cannot be
received by a radio set to receive a AEGIS transmission.
Cryptographic keys are transferred to the radio using a cryptographic
Keyloader. Up to six (6) different cryptographic keys, numbered 1-6, can be
transferred from a Keyloader and stored in the radio. An individual key is
automatically selected on a per-channel basis according to the radio’s
programming. Channels within AEGIS systems can be programmed for keys
1-6. Channels within VGE digital systems can be programmed for keys 1-6.
VGE digital radios require a VGE Keyloader (Option 4028 with software
version 2.n or later).
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