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Full Duplex Calls
To use the secure communication mode:
G)
Ensure your CIK is inserted and turned one-quarter turn
clockwise.
NOTE
The C/K must remain inserted while the terminal is in secure mode.
NOTE
Once the C/K is inserted in the STU 111/SECTEL 1000, the terminal and CIK
become classified to the level you are keyed. Consult your security procedures
for instructions on how to properly handle your equipment.
@
Place a clear call and establish contact with the person to
whom you will be communicating in the secure mode (see
the paragraph above, PLACING CLEAR MODE CALLS).
@Tell the person you want to establish a secure conversation.
G)
Verify that the VOICE annunciator on the message display is
on. If it is not, press
I
VOICE/DATA
I
to enter the voice mode.
@
Verify that the HD annunciator on the message display is off.
If it is not, press
I
HALF DUPLEX
I .
@
Press
I
SECURE
I
.The message display will show the following
message:
f::
n
i· ..
1' · - 1
r: J -.
. .J -·
, .
.-- ,-- -·. ' ' r·· ·--
:::= :::
L
u
1"::
i::
VOICE
2.4
G)
The STU 111/SECTEL will take approximately 15 seconds to
enter the secure mode. During this time, both terminals are
exchanging and validating authorization information to
determine if you AND the person you are talking with have
authorized access to the secure mode. While this is occurring,
both handsets are disabled.
NOTE
If the terminal classifications allow for a secure call. but the highest
classification levels do not match. the terminals will default
to
the highest
common classification level of the two terminals.
5·3
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