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The multiline STU 111/SECTEL is compatible with the 1 A2 multiline
key system and can be installed in an existing 1 A2 system. In
addition to containing all of the features of the single line two·wire
model, the multiline model provides four·line capability, an
intercom, and a hold function (or five lines and a hold function).
The telephone line cord is hard-wired to the instrument and is
terminated in a 50-pin connector compatible with those used in the
1A2 system.
SECURE TELEPHONE
TERMINAL
Figure
9-2.
Multiline Model
Data
Crypto
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Ignition Key
IA2
Interface
Power
Converter
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9-3
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