S E T T I N G U P O F A C L E A R C A L L - Philips SPENDEX 40 Operating Manual
Speech encryptiun decryption equipment for use on nato-ivsn system incorporating kdc
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Also See for SPENDEX 40:
- Maintenance manual (65 pages) ,
- Operating instructions manual (21 pages)
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SPENDEX 40 UA 8251/00
NATO RESTRICTED
OPERATING MANUAL
5 . 3 S e t t i n g u p o f a C l e a r C a l l
This section describes the actions to be performed in order to set up
an IVSN clear call.
[
I
I
I
I
' I I
I
I
Actions
Calling terminal
Called terminal
(if SPENDEX 40)
LED
Display
LED
Display
Start conditions:
- Terminals on hook
• • *
» •
" *
«
Calling terminal:
1. Go off hook (see
Note 1).
X"
» *
"
2. Wait for dialling tone.
X"
» *
«
3. Select, if required, a
precedence level by
pressing the P key
once, twice, three or
four times (see Note 2):
- pressing once:
- pressing twice:
- pressing three times:
- pressing four times:
"PRIORITY"
"IMMEDIAT"
"FLASH
"FLSH OVR"
» *
"
4. Dial in IVSN telephone
number.
" NNNNNNN"
( r i n g
" *
» •
jing signal)
Called terminal:
1. Go off hook.
" NNNNNNN"
"PLAIN
Nonsecure speech possible
(see Note 3)
NNNNNNN - seven digits of I\ SN telephone numbei • (N - 0...9)
Note 1: Before setting up a clear call in preparation for setting up
a secure call, check first that the relevant key variable is
present (see section 5.8 or section 5.9).
Note 2: Selection of a precedence level is only possible if the IVSN
access switch is programmed accordingly. A precedence level
can be chosen only once. Correction of the precedence level
is possible only after going on hook again, then going off
hook and selecting the appropriate level.
Note 3: A rapid intermittent signal during conversation indicates
pre-emption; finish conversation immediately and go on hook.
9922 154 12551
5-2
NATO RESTRICTED
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