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← Siemens Phone
Secure digital telephone
The CTE-020 was a military digital EUROCOM-standard
secure phone, that was developed
by Siemens in Munich (Germany) in the early 1990s under contract
for the German Airforce. It was intended as a Remote Digital Engineering Order-Wire
(EOW) Terminal as part of the Airforce's digital network, in places where the EOW
terminal is remote from the transmission equipment [1].
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The image on the right shows a typical Siemens CTE-020 terminal with
the standard handset attached. User interaction is via the
membrane keyboard, the alpha-numeric display and some dedicated
indicator lamps.
The unit interfaces to a EUROCOM compatible digital network
with a data rate of 16 or 32 kbits/s.
Secure communication is possible by using the (optional)
ciphering module that can be plugged into a recessed socket
at the rear. The ciphering module acts as a Crypto Ignition Key (CIK)
and is shown in a separate image.
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The CTE-020 was in production for many years and was subsequently delivered
by Siemens (1994), Daimler-Benz Aerospace (1999) and finally EADS (2006).
During these years, it was supplied to several NATO and other European
countries. In Germany it was part of the
AUTOKO 90 project,
the communications system of the German Army (Bundeswehr) [2].
The terminal was phased out around 2010 and some units appeared on the
surplus market in late 2012.
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A complete CT-020 terminal unit consists of the following items:
- CTE-020 base unit
- Handset in canvas bag
- Crypto Module
- Cable set
- Break-out box
- User Manual
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The standard CTE-020 terminal is only suitable for non-secure digital
voice communication. Secure voice (crypto) is possible by inserting a
special cipher module into a slot with an 81-pin high-density socket
at the rear of the terminal.
The module contains the cryptographic engine, complete with the digital
cipher algorithm, and can hold up to 8 independent keys.
In the event of a compromise, the use can purge the crypto keys
by pushing down the switch marked EMGY (Emergency) at the rear of the
terminal. The red seal is then broken and the module is ZEROIZED.
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- Service channel: EUROCOM D/1 line configuration
- Call type: selective call, line call and far-end call capability
- Calling procedure: EUROCOM D/1 I A 11 or Siemens proprietary selective call
- Selective call: Siemens proprietary selective call with up to 254 addresses
- Operation mode: half-duplex (use PTT-switch)
- Modulation: EUROCOM D/1 I A 11 Delta Modulation (CVDS) 16/32 kbit/s
- Crypto: external digital ciphering module with up to 8 keys
- Digital interface: NRZ Data, V.11, synchronous, 8-wire data/clock in/out
- Power Supply: 24V DC with reverse protection (220V with optional PSU), 10W
- Temperature range: -40 to +55°C (operation) and -55 to +70°C (storage)
- Relative humidity: up to 100%
- Mechanical/climate stress: DEF-STAN 07-55, VG 95332, MIL-STD-810
- EMC: MIL-STD-461D
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- Jane's Military Communications, CTE 020 remote digital Engineering Order-Wire Terminal
Fifteenth Edition 1994-95, p. 398.
Link...
- Jane's Military Communications, CTE 020 remote digital Engineering Order-Wire Terminal
2005-2006, pp. 357-358.
- Materialamt der Luftwaffe, Technisches Handbuch Dienstkanalgerät CTE 020
GAF T.O 31R2-2-SIE8-2 (German). 1 March 1993.
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© Crypto Museum. Created: Thursday 20 December 2012. Last changed: Saturday, 24 February 2018 - 17:43 CET.
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