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Section 6
Line-connected operation
6.1 Line circuits
The teleprinter contains the appropriate line interfacing circuitry to
match the type of line. Connect the line warning lamp to the rear con
nector (28) and a mains socket and connect the pedal to the line warn
ing lamp. If the lamp is not used, the pedal may be connected to the
connector (28) directly.
6.2 ComSec measures
In order to prevent the compromise of classified information because
of an operator's mistake, the following ComSec measures have been
incorporated:
1. Clear text can be transmitted from the keyboard/tape reader only
as long as the pedal (shunt device) is actuated at least every 4
seconds.
2. As soon as AROFLEX is connected to the line, the line warning
lamp warns the operator that he is no longer operating in the
OFF-LINE mode.
3. Only messages enciphered and stored in the INDIRECT EN
CIPHERING mode can be transmitted without repeatedly actu
ating the shunt device.
4. At the user's option (see paragraph 7.4) even the input of the clear
text Heading/Preamble of a line-connected AROFLEX may be sub
jected to the use of the shunt device in order to force the operator
to assume the ENCIPHERING mode as soon as possible.
5. Reception of clear or crypto messages is always possible; an in
coming call has priority over the OFF-LINE mode. A standby line-
connected AROFLEX will normally have the PUNCH STANDBY
and DECI buttons pushed down, so that received messages (both
clear text and crypto) will be printed and punched. If a crypto
message cannot be deciphered, it will be punched so that it can
be processed later.
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