Motorola TETRA MTM800 Manual page 202

To verify SCK validity for DMO, press
show one of the following messages:
DMSCK is Valid
DMO.
DMSCK is Invalid
DMO. Please call your Service Provider to restore SCKs to
your MTM800.
Covert Mode
From the main menu, select
Set Covert Mode to On
Select 1 On. All tones are set to off, and the
backlight and the LED are disabled
immediately.
The audio is further more routed to the external loudspeaker – if
connected – until the loudspeaker is switched off. It is
recommended to use e.g. a headset in Covert Mode.
Set Covert Mode to Off
Select 2 Off. All settings for tones and backlight are restored.
The LED is enabled and the message Covert Mode Off is
shown.
DMO SCK (
Once in the menu, select
Key version is displayed when you select the option.
Air Interface encryption provides service confidentiality
between your MTM800 operating in Direct Mode and another
terminal or a group of terminals operating in Direct Mode.
You can change the current key, if the key change operation
is allowed by your Service Provider.
78
— your MTM800 can work encrypted in
— your MTM800 cannot work encrypted in
( 3 8)
3 9)
. The display will
Ok
3 Security – 8 Covert Mode
3 Security – 9 DMO SCK
.
1 On
2 Off
.