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repeaters. Both of these methods are susceptible to interception
by rival businesses or governments. The STU 111/SECTEL
(Figure 1-1) provides the high level encryption necessary to protect
our nation's military and industrial secrets.
• Small Size. No larger than a standard office telephone, the STU
111/SECTEL fits easily on any desk.
• No noisy blowers or fans. An efficient external power converter
assures that the STU 111/SECTEL will be a welcome addition to
any office environment.
• Retention of emergency communications. If power is
interrupted for any reason, the STU 111/SECTEL will function as
a plain old telephone (POT) to provide reliable communications
in an emergency situation.
• Field upgradeability. Motorola is continually developing
enhancements to ensure that the STU 111/SECTEL maintains its
state-of-the-art position among secure communications systems.
• Ease of programming. With many user-definable parameters,
the STU 111/SECTEL can be tailored to your individual
requirements.
• Ease of use. The adjustable message display shows the status of
all STU 111/SECTEL modes and functions.
• Dialing flexibility. The STU 111/SECTEL is compatible with both
tone and pulse dialing systems.
• Adjustable handset speaker and ringer. The handset speaker
and ringer volume can be set to meet your individual needs.
• Standard telephone with speed-dialing capability.
• No batteries to replace.
In addition to the features listed above, the STU 111/SECTEL (Bell
1A2) Model offers multiline operation, an intercom function, a
HOLD feature, and LED indicators for these additional functions.
Motorola also offers a STU 111/SECTEL which is directly
compatible with the AUTOVON telephone network.
1-3
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