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Motorola USA Phone SECTEL 9600 → ← 2500
Secure voice/data terminal · DES · Type 3
- this page is a stub
SECTEL 3500 is a secure telephone, introduced
in the late 1980s by Motorola in Seguin (Texas, USA).
It was intended for use by approved US Government contractors.
The device was suitable for the transmission of sensitive or
company-proprietary information, and uses the FIPS
Data Encryption Standard (DES)
for protection of speech and data.
It is interoperable with SECTEL 2500.
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Speech is digitized by means of an internal LPC-10e vocoder
which uses a very low bandwidth. The device offers
a good quality audio at a data rate of just 2400 baud, as a result
of which it can be used on virtually any
POTS telephone network in the world.
Data can be transferred at 2400, 4800 or 9600 baud with
full encryption.
The SECTEL 3500 is an NSA Type 3 device and holds only one
cryptographic algorithm: DES.
Nevertheless it is interoperable with the SECTEL 2500,
which has two built-in algorithms: a secret Type 2 STU-III
algorithm and DES.
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At present, Crypto Museum does not have a SECTEL 3500 in its
collection, but its operation is similar to that of the
SECTEL 2500. For further informatiom, please refer
to this page page.
➤ SECTEL 2500
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Key material can be transferred between SECTEL 3500 units by means
of the KSD-64 Key Storage Device (KSD).
Once the device is enabled, the KSD-64
is converted into a Crypto Ignition Key (CIK) which is paired
with the device.
➤ More about the KSD-64
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To suit both the safety requirements of the customers and US Government
regulations, different SECTEL models were manufactured, all based on the same
basic hardware design and enclosure. The firmware and the cryptographic
algorithms are different however. The diagram below shows how they
are positioned. Only the SECTEL 1000 series and
2000 series are STU-III compatible.
Click any of the balloons above for additional information about the
related SECTEL model. The SECTEL 3500 is interoperational with the
SECTEL 2500 by using the latter in Type 3 mode.
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The SECTEL 1500 phone is powered by an external Power Supply Unit (PSU)
that provides three different voltages: +5V (1.75 A), +12V (250 mA) and
-12V (210 mA). The PSU is connected to the 7-pin (or 8-pin) 270° DIN
socket at the rear of the unit. The socket has the following pinout:
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- +12V
- -12V
- +5V
- 0V (GND)
- 0V (GND)
- +5V
- 0V (GND)
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Device Encrypted PSTN telephone Purpose Sensitive voice conversations Model SECTEL 3500 Family SECTEL Developer Motorola Manufactuer Motorola GEG Year 1988 Country USA Users US Government-approved customers Speed 2400, 4800, 9600 baud Vocoder LPC-10E, CELP, MRELP Encryption DES (NSA Type 3) CIK KSD-64 Dimensions ? Weight ? Quantity ? Price ?3395
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© Crypto Museum. Created: Sunday 11 July 2010. Last changed: Monday, 23 September 2024 - 09:07 CET.
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