HAGEUN-CRYPTOS
CRYPTO AG
3B866
CRYPTOCOiVP HC-250
INSTALLATION INSTRUCTIONS
3B866
HAGEUN-CRYPTOS
CRYPTO AG
WARNING: THE HC-250 OPERATES WITH 110 OR 220 VAC MAINS.
ALWAYS ENSURE THAT CORRECT GROUNDING CONNECTIONS
ARE MADE. AVOID CONTACT WITH CONDUCTORS CARRYING
110/220 V. FAILURE TO COMPLY WITH THESE PRECAUTIONS
MAY RESULT IN SEVERE INJURY.
CAUTION: BEFORE CONNECTING THE SYSTEM TO THE MAINS SUPPLY,
ENSURE THE VOLTAGE SELECTOR IS SET TO THE CORRECT
POSITION.
DETAILS ON VOLTAGE SELECTION ARE INCLUDED IN
SECTION 6 TO THESE INSTRUCTIONS.
"
3B866
HAGEUN-CRYPTOS
CRYPTO AG
TABLE OF CONTENTS
Page
1, GENERAL 1-1
i-i
1-2
1-3
1-5
1-5
1-5
1-5
1-6
2-1
2-1
2-1
2-1
2-1
2-2
2-2
2-2
2-3
2-3
2-3
3-1
3-1
3-1
3-2
3-3
3-4
3-5
3-5
3-6
3-6
3-6
3-7
3-7
3-8
1.1. DESCRIPTION OF THE EQUIPMENT
1.2. PRINCIPLES OF OPERATION
1.3. KEY HIERARCHY
1.4. MECHANICAL CONSTRUCTION
1.4.1.
REMOTE CONTROL UNIT
1.4.2.
BASIC UNIT
1.4.3.
PORTABLE VERSION
1.5.
ACCESSORIES
2,
TECHNICAL DATA
2.1.
AUDIO INTERFACE
2.2.
COMMUNICATION INTERFACE
2.3.
TRANSMISSION DELAY
2.4.
SIGNALLING
2.5.
SYNCHRONIZATION
2.6.
CHANNEL REQUIREMENTS
2.7.
CRYPTOLOGICAL DATA
2.8.
POWER SUPPLY
2.9.
ENVIRONMENTAL
2.10.
DIMENSIONS AND WEIGHT
3, SYSTEM DESIGN
3.1.
DESCRIPTION OF PCB FUNCTIONS
3.1.1.
INTERFACE BOARD
3.1.1.1.
Universal Interface Board
3.1.1.2.
Half-Duplex Interface Board
3.1.2. FILTER/MIXER BOARD
3.1.3. CODER BOARD
3.1.4. MICROPROCESSOR BOARD
3.1.5.
MEMORY BOARD
3.1.6.
DIGITAL INTERFACE BOARD
3.1.7.
POWER SUPPLY BOARD
3.1.8.
FRONT PANEL
3.1.9.
REMOTE CONTROL UNIT
3.2. SIGNAL LIST
HAGEUN-CRYPTOS
3B866 CRYPTO AG -II-
4 1
4
1
1
4. 1 2
4 1 3
4 1
4
4
1 .5
4 2
4 3
Page
4 . I N T E R F A C I N G P R I N C I P L E S ^
INTERFACING CONCEPTS FOR DIFFERENT APPLICATIONS 4-1
S T A N D A R D T E L E P H O N E A P P L I C A T I O N S 4 - 1
R A D I O T E L E P H O N E A P P L I C A T I O N S 4 - 1
HALF-DUPLEX RADIO APPLICATIONS WITH UNIVERSAL
I N T E R F A C E B O A R D 4 - 3
HALF-DUPLEX RADIO APPLICATIONS WITH HALF-DUPLEX
I N T E R F A C E B O A R D 4 - 4
HALF-DUPLEX RADIO APPLICATIONS WITH X-MODE INTERFACES 4-5
DETAILED DESCRIPTION OF UNIVERSAL INTERFACE BOARD 4-6
DETAILED DESCRIPTION OF HALF-DUPLEX INTERFACE BOARD 4-13
5 , A C C E S S O R I E S 5 - " >
5.1. MOUNTING KIT MDF-lOO 5-1
5 . 2 . G O O S E N E C K M D G - l O O 5 - 2
5 . 3 . B A T T E R Y S U P P L Y C A B L E A C P - 2 5 0 5 - 2
5 . 4 . A C M A I N S C A B L E A C C - 1 2 3 5 - 2
5 . 5 . R E M O T E C O N T R O L C A B L E R C C - 2 5 0 5 - 3
5 . 6 . A U D I O C A B L E A F C - 2 5 0 5 - 3
5 . 7 . S Y S T E M C A B L E C A S - 2 5 0 5 - 4
5 . 8 . B Y P A S S P L U G T E P - 2 5 0 5 - 4
5 . 9 . M O U N T I N G H A R D W A R E P A H - 2 5 0 5 - 4
5 . 1 0 . T E L E P H O N E T F C - 2 5 0 5 - 4
6 . I N S T A L L A T I O N P R O C E D U R E S 6 " ]
6 . 1 . I N S TA L L AT I O N S U S I N G T H E S Y S T E M C A B L E C A S - 2 5 0 6 - 1
6.1.1. CONNECTING THE REMOTE CONTROL BRANCH OF THE SYSTEM CABLE
T O T H E R E M O T E C O N T R O L U N I T 6 - 1
6.1.2. CONNECTING THE AUDIO BRANCH OF THE SYSTEM CABLE TO A
T E L E P H O N E S E T 6 - 2
6 . 1 . 3 . C O N N E C T I N G T H E P O W E R S U P P L Y 6 - 3
6 . 2 . I N S TA L L AT I O N S U S I N G T H E M O U N T I N G K I T M D F - 1 0 Q 6 - 4
6.2.1. CONNECTING THE REMOTE CONTROL UNIT TO THE REMOTE
C O N T R O L C A B L E R C C - 2 5 0 6 ~ 5
6 . 2 . 2 . C O N N E C T I N G C A B L E S T O T H E M O U N T I N G K I T 6 - 7
6 . 2 . 2 . 1 . R e m o v i n g t h e R e a r P a n e l o f t h e M o u n t i n g K i t 6 - 7
6.2.2.2. Connecting the DC cable ACP-250 6-7
6.2.2.3. Connecting the Remote Control Cable RCC-250 6-7
6.2.2.4. Connecting the Audio Cable AFC-250 6-7
6 . 2 . 2 . 5 . R e p l a c i n g t h e R e a r P a n e l o f t h e M o u n t i n g K i t 6 - 8
6.2.2.6. Additional Grounding 6-8
6 . 2 . 3 . C O N N E C T I N G T H E P O W E R S U P P L Y 6 - 8
HAGEUN-CRYPTOS
3B866 CRYPTO AG -HI"
Page
6 . 2 . 3 . 1 . C o n n e c t i n g A C S u p p l y 6 - 8
6 . 2 . 3 . 2 . C o n n e c t o n g D C S u p p l y 6 - 8
6 . 3 . I N S TA L L AT I O N O F T H E P O R TA B L E V E R S I O N 6 - 9
7 . A D A P T I O N O F I N T E R F A C E B O A R D 1 A
1 1 STANDARD TELEPHONE APPLICATIONS (UNIVERSAL INTERFACE BOARD) 7-2
7*2 RADIO TELEPHONE APPLICATIONS (UNIVERSAL INTERFACE BOARD) 7-3
7*3* HALF-DUPLEX RADIO APPLICATIONS (UNIVERSAL INTERFACE BOARD) 7-4
8. PARAffTER PROGRAMING
A.1.1
A.1.2
A.1.3
8-1
9, TROUBLESHOOTING 9_1
9 1 C H E C K L I S T F O R O P E R AT I N G PA R A M E T E R S 9 - 2
9 2 S U M M A R Y O F P O S S I B L E M A L F U N C T I O N S 9 - 3
9 2 1. MALFUNCTIONS ASSOCIATED WITH POWER SUPPLY 9-3
9.2.2. MALFUNCTIONS ASSOCIATED WITH SYNCHRONIZATION AND P/C
SWITCHING 9-4
9.2.3. MALFUNCTIONS ASSOCIATED WITH ACTUAL COMMUNICATION 9-6
Al: APPENDIX: Programming of Structure Key and Key Input
Identification Code Al-1
Format and Size Al-1
A d d r e s s A s s i g n m e n t \
Standard Data A1~2
A.1.4. Customer Specific Programming of the Key Input
Identification Code Al-3
A.1.5. customer Specific Programming of the Structure Key Al-4
HAGEUN-CRYPTOS
1
3B866 CRYPTO AG -IV-
'
FIGU
RES
Fig.
1.1.
Fig.
1.2.
Fig.
1.3.
Fig.
1.4.
Fig.
1.5.
Fig.
3.1.
Fig.
3.2.
Fig.
4.1.
Fig.
4.2.
Fig.
4.3.
Fig.
4.4.
Fig.
4.5.
Fig.
4.6.
Fig.
4.7.
Fig.
4.8.
Fig.
4.9.
Fig.
4.10
Fig.
4.11
Fig.
4.12
Fig.
4.13
Fig.
4.14
Fig.
4.15
Fig.
5.1.
Fig.
5.2.
Fig.
5.3.
Fig.
5.4.
Fig.
5.5.
Fig.
5.6.
Fig.
5.7.
Fig.
5.8.
Fig.
6.1.
Fig.
6.2.
Fig.
6.3.
Fig.
6.4.
Fig.
6.5.
Fig.
6.6.
Fig.
6.7.
Fig.
6.8.
Fig.
6.9.
Fig.
6.10
DUPLEX VOICE CIPHER SYSTEM
HC-250 PORTABLE VERSION
PRINCIPLES OF OPERATION
LOCATION OF MODULES
ACCESSORIES
BLOCK DIAGRAM
PIN ASSIGNMENT OF SYSTEM CONNECTOR
"
"
INTERFACING TO STANDARD TELEPHONE
INTERFACING TO RADIO TELEPHONE (USING UNIVERSAL
INTERFACE BOARD)
INTERFACING TO HALF-DUPLEX RADIO (USING UNIVERSAL
INTERFACE BOARD)
INTERFACING TO HALF-DUPLEX RADIO (USING HALF-DUPLEX
INTERFACE BOARD)
INTERFACING TO HALF-DUPLEX RADIO (WIRING OF MAIN
FUNCTION)
INTERFACING TO HALF-DUPLEX RADIO WITH X-MODE INTERFACE
FUNCTION DIAGRAM OF UNIVERSAL INTERFACE BOARD
UNIVERSAL INTERFACE BOARD CIRCUIT MODIFICATIONS
UNIVERSAL INTERFACE BOARD: CONTROL INPUT SECTION
UNIVERSAL INTERFACE BOARD: COMPONENT LAYOUT
GAIN SETTING OF INTERFACE AMPLIFIERS
FUNCTION DIAGRAM OF HALF-DUPLEX INTERFACE BOARD
HALF-DUPLEX INTERFACE BOARD CIRCUIT MODIFICATIONS
HALF-DUPLEX INTERFACE BOARD: CONTROL SIGNAL SECTION
HALF-DUPLEX INTERFACE BOARD: COMPONENT LAYOUT
MOUNTING KIT MDF-100
GOOSENECK MDG-100
DC BATTERY SUPPLY CABLE ACP-250/AC MAINS CABLE ACC-123
REMOTE CONTROL CABLE RCC-250
AUDIO CABLE AFC-250
SYSTEM CABLE CAS-250
BYPASS PLUG TEP-250
MOUNTING HARDWARE PAH-250
SCHEMATIC DIAGRAM CIPHERED TELEPHONE (SUBSCRIBER)
SIDE FITTING OF REMOTE CONTROL CABLE
FITTING OF AUDIO BRANCH OF SYSTEM CABLE TO TELEPHONE
STATIONS
WIRING OF SCREW TERMINALS
SCHEMATIC DIAGRAM CIPHERED MOBILE STATION
FITTING REMOTE CONTROL CABLE THROUGH BASE PLATE
MOUNTING THE REMOTE CONTROL UNIT USING THE GOOSENECK
WIRING OF MOUNTING KIT MDF-100
GROUNDING RECOMMENDATIONS
INSTALLATION OF HC-250 PORTABLE VERSION
HAGEUN-CRYPTOS
3B866 CRYPTO AG -V-
FIGURES
Fig. 7.1. INTERFACE PARAMETERS (FOR UNIVERSAL INTERFACE)
Fig. 7.2. INTERFACE PARAMETERS (FOR HALF-DUPLEX INTERFACE)
Fig. 8.1. SUMMARY OF OPERATING PROCEDURES
Fig. 8.2. DETAILED OPERATING PROCEDURES
Fig. 10.1. MEMORY BOARD COMPONENT LAYOUT
HAGEUN-CRYPTOS
3B866 CRYPTO AG 1-1
1. GENERAL
This manual is intended to aid trained technicians to install the
HC-250 Voice Ciphering System.
1.1. DESCRIPTION OF THE EQUIPMENT (Ref. Figs. 1.1 and 1.2)
The CRYPTOCOM® HC-250 is a high security voice ciphering system
designed for operation over switched telephone networks, fixed
and mobile UHF/VHF and HF-SSB radio links. The HC-250 uses sophisti
cated ciphering techniques and advanced technology, eliminating re
sidual intelligibility on the line and giving excellent speaker re
cognition, yet providing a high level of security.
The complete system consists of a basic unit and a remote control
unit, which are connected to a telephone or radio. All operating
procedures are carried out via the remote control unit, thus allowing
the basic unit to be located conveniently. A version is also available
as a self-contained cipher terminal, housed in an attractive Samsonite
briefcase. This version is referred to in these instructions as the
"portable version".
An integrated key management system, providing a customer specific
parameter, a structure key, communication keys, user identification
codes and a key-input identification code, allows adaption to user
requirements. The system can either be programmed for simple opera
tion, where the only operator intervention required is the switching
between plain and cipher, or a more complex hierarchy can be estab
lished, to protect against unauthorized use. In normal telephone
operations it is possible to use a telephone for the plain/ cipher
switching.
The system also includes built-in self-test features (BITE), which
facilitate the detection of failures and faults.
The CRYPTOCOM®HC-250 is designed to operate, in duplex or half-
duplex mode, via practically any voice grade circuit, such as:
HAGEUN-CRYPTOS
3B866 CRYPTO AG 1 -2
Switched public telephone networks
Fixed or mobile VHF/UHF radio communication systems for military
governmental and civilian (VIP) applications.
HF/SSB long distance radio communications for strategic links,
embassy communication networks, etc.
The system is designed to meet all the requirements for universal
voice ciphering equipment, including:
Good quality, intelligibility and speaker recognition of the
ciphered voice signal
Ease of operation without restriction of the equipment's
versatility
Complete freedom from residual intelligibility of the ciphered
signal, giving very high level security
High immunity from transmission disturbances, such as linear and
non-linear distortions, fading, noise, etc.
Fully automatic operation, i.e. synchronization, key check,
tracking, etc.
1.2. PRINCIPLES OF OPERATION (Ref. Fig. 1.3)
The heart of the HC-250 Duplex Voice Cipher System is a micro
processor, which
Controls all operations
Calculates the key stream generator, the permutation, etc.
Generates a message key and performs a key check in both sets
of equipment during the initialization phase
Permits an interactive dialogue with the operator through the
remote control unit for mode and key selection, user identifi
cation code, test routines, etc.
-
-
"
HAGEUN-CRYPTOS
36866 CRYPTO AG
The HC-250 employs a fully automatic, initial loop synchronization
with additional tracking. It consists of time frame and key stream
synchronization using an automatically generated message key which
sets the key generator at the receiving side accordingly. During
this initialization phase a check is also performed to ensure that
both stations are using the same key. This key check is carried out
using the key "signature", which is a derivative of the key itself.
The initialization procedure is automatically carried out for the
return path. In multi-point communications with push-to-talk opera
tions the initialization procedure is repeated before each trans
mission phase and no key check is carried out.
The voice signals from the microphone (350 - 3000 Hz) are first
matched for level and impedances in the audio interface board and
are then passed to the analog signal processing board. The resulting
■ s i g n a l s a r e t h e n c o n v e r t e d i n t o d i g i t a l f o r m , f o r f u r t h e r p r o c e s s i n g
in the CPU, where the signals are divided into time segments of
different lengths. These slots are then permutated according to the
- k e y s t r e a m g e n e r a t o r s i g n a l s . T h e s e g m e n t a t i o n y i e l d s a v a r i e t y o f
1.3 x 10 and the permutation of 4.8 x 10 . After permutation the seg
ments are transmitted with a certain time compression which allows the
introduction of tracking information in order to maintain synchronism.
At the receiving end the ciphered information is processed and con
verted back into plain audio signals and interfaced to the earpiece.
The HC-250 may be adapted to any kind of audio equipment by adaption
of the audio interface board.
1.3. KEY HIERARCHY
The key stream generated depends on four different keys:
Customer-specific parameters
Structure key (SK)
Communication key (CK)
Message key (MK)
HAGEUN-CRYPTOS
3B866 CRYPTO AG 1 -4
The customer-specific parameters provide a diversity of 10 and are
programmed and stored in a Programmable Read Only Memory (PROM). These
parameters influence the structure of the key stream and are individu
ally programmed for the customer by CRYPTO AG.
The structure key is a secret hardware key, stored in an Eraseable
Programmable Read Only Memory (EPROM). It has a diversity of 10308
and is the same in every unit of a specific communication network. As
the name indicates, the SK has a decisive influence on the structure
of the key stream, as well as having a role in the initialization
procedure. The user can generate his own structure key at any time
by means of a suitable EPROM programming unit.
The communication key is the secret software key. It provides diversity
in the sense that every new communication key, together with the
structure key, defines a new key stream. The communication key may be
entered and changed by the security officer. It consists of 32 decimal
32
digits providing a diversity of 10 (for each key). The HC-250 is
capable of storing 8 independent communication keys (CK) allowing the
formation of a key hierarchy.
The message key is the synchronization key which, together with the
SK and CK, defines the starting point of the key-stream generator.
Hence, the starting point is different with every new initialization,
This start address is also sent to the receiving unit.
In addition to these four keys, the key hierarchy is extended by
the use of two indentification codes
The user identification code (UIC)
The key input identification code (YIPIC).
The user identification code provides protection against unauthorized
use by transforming the communication key before it is stored in the
CK memory. This code may consist of up to 8 digits. A transformed key
can only be used for ciphered conversation if it is first correctly
retransformed.
The key input identification code restricts the input of communication
keys to authorized persons. The key input identification code is pro
grammed in an EPROM and consists of up to 8 digits.
"
HAGEUN-CRYPTOS
'
3B866 CRYPTO AG 1-5
1.4. MECHANICAL CONSTRUCTION
The HC-250 system consists of two separate units: the basic unit and
the remote control unit.
1.4.1. REMOTE CONTROL UNIT
The remote control unit is constructed in such a way that it may be
placed on a desk or, by means of an additional mounting kit, mounted
in a vehicle within easy reach of the operator or driver. The unit
contains a keyboard, an eight-position display and a mechanical
security lock. This unit also houses the electonics required for the
remote control functions.
1.4.2. BASIC UNIT (Ref. Fig. 1.4)
The basic unit is a modular design allowing access to the printed
circuit boards (pcbs) as shown in Fig. 1.4. The system connector is
located on the front panel of this unit. The front and rear panels
are each fixed to the main housing by 4 screws. Access to the pcbs
is gained by removing the screws retaining the rear panel. Access
to the AC module is obtained by removing the screws retaining the
front panel.
1.4.3. PORTABLE VERSION (Ref. Fig. 1.2)
A version of the HC-250 system is also available as a self-contained
cipher terminal. In this version the remote control and basic units
are housed in an attache case together with an integral telephone.
Operation is carried out using the keyboard, which is accessible
when the attache case is opened.
HAGEUN-CRYPTOS
3B866 CRYPTO AG 1-6
1.5. ACCESSORIES
The following accessories are available:
MDF-100 Mounting Kit
For mobile applications, the basic unit is attached to the
mounting kit with quick-release catches. In the kit all
installation cables are combined and led to the system connec
tor.
MDG-100 Gooseneck
This device provides flexible mounting for the remote control
unit in mobile applications.
A wide range of cables is available to meet customer require
ments, including:
ACP-250 DC Battery Supply Cable
ACP-103 AC Mains Cable (2 core)
ACC-123 AC Mains Cable (3 core)
CAS-001 System Interface Cable
CAS-250-003 System Interface Cable (for use with TFC-250)
AFC-250 Audio Cable
RCC-250 Remote Control Cable
TEP-250 Bypass Plug
PAH-250 Mounting Hardware
TED-250 Diagnostic Test Module
This unit permits testing and troubleshooting of the HC-250
system.
TFC-250 Telephone Station
This telephone is equipped with a facility for remote
P/C switching.
•
3B866
HAGEUN-CRYPTOS
CRYPTO AG
2-1
2.
2.1
TECHNICAL DATA
AUDIO INTERFACE
Input
Output
Impedances
Frequency Range
Microphone DC-Supply
2 mV -,...1.5 V ,,, floating
eff eff a
10 mV
,, ... 1.5 ,,, floating
eff eff 3
300^/200^
350...3000 Hz
15V, 30 mA, floating
2.2. COMMUNICATION INTERFACE
Input
Output
Impedances
Frequency Range
10 mV ,,...1.5 V ,,, floating
2 mV ,,...1.5 V ,,, floating
eff eff 3
300n /200fi
640...2880 Hz
2.3.
2.4.
TRANSMISSION DELAY (END TO END)
Standard Operation 314 ms
With Enhanced Duplex Comfort 130 ms
)
user selectable
SIGNALLING
Frequencies
1302 /1736 Hz
1085 /I 519 Hz
1519 /1953 Hz
)
user selectable
HAGEUN-CRYPTOS
3B866
CRYPTO AG
2-2
2.5
SYNCHRONIZATION
Initialization Time:
Tracking:
Maximum Time of
Line Interruption:
Point-to-Point Communication:
2.3 seconds, if necessary the procedure
is repeated
Multipoint Communication:
Approximately 1 second before each
transmission phase.
continuous
100 seconds over full temperature range
1000 seconds typical
2.6. CHANNEL REQUIREMENTS
Transmission Bandwidth
- Standard operation
- with Slightly Reduced
Voice Quality
Transmission Loss:
Signal to Noise Ratio
Frequency Drift
600...2900 Hz
600...2400 Hz
< 30 dB
> 10 dB
< 100 Hz
2.7. CRYPT0L0GICAL DATA
Customer Specific
Parameter:
Structure Key:
Communication Key:
Message Key:
User Identification Code:
Key Input Identification
Code:
27
diversity of 10 stored in a
customer specific PROM, programmed by
CRYPTO AG.
qno
diversity of 10 stored in EPROM
programmable by the customer
32
8 keys with a diversity of 10 each
4
Diversity of 6.5 x 10 , automatically
generated
up to 8 digits
up to 8 digits
HAGEUN-CRYPTOS
3B866
CRYPTO AG
2-3
2.8. POWER SUPPLY
DC Supply:
AC Supply:
Consumption:
Fusing:
2.9. ENVIRONMENTAL
9...30 V
110/220 V - 20 %, 45...65 Hz.
Approx. 12W (stand-by < 100 mW, for 12VDC)
DC: 2.5A fast blow (on connecting board)
AC: 500 mA slow blow (externally accessible)
Storage Temperature:
- 20° ... 80° C
Operating Temperature:
- 10° ... 60° C
Vibration: 2.5 g, 7 ... 200 Hz
Shock: 30 g, 11 ms
Electromagnetic Compati
bil
ity
Conducted and Radiated
Emission:
Radiation Susceptibility:
10 kHz ... 30 MHz AM
30 MHz ... 1 GHz FM
Within requirements of CE-03 and RE-02
of MIL-STD 461B, class Al
10 V/m
5 V/m
(Test set-ups according to MIL-STD 462)
2.10. DIMENSIONS AND WEIGHT
Basic Unit
Remote Control Unit:
78 x 225 x 256 mm
4.2 kg (3.2 kg without AC supply module)
32 x 152 x 100 mm
0,5 kg
ALL SPECIFICATIONS SUBJECT TO CHANGE
■
HAGEUN-CRYPTOS
3B866 CRYPTO AG 3^
3, SYSTEM DESIGN
"
The HC-250 system consists of two separate units;
the basic unit and the remote control unit.
The majority of the electronic circuitry is located
on the printed circuit boards housed in the basic unit.
3.1 DESCRIPTION OF P.C.B. FUNCTIONS
The block diagram (Fig. 3.1) of the cipher system shows
the individual function groups and the most important
signal paths. Each of the blocks in Fig. 3.1 corresponds
to a printed circuit board, with the exception of the
AC module which is mounted on the front panel.
The following paragraphs describe the individual blocks.
3.1.1 INTERFACE BOARD
All main and auxiliary signals which are exchanged between
the cipher system and the transmission equipment are passed
via the interface board.
A very high adaptability to user requirements is
achieved, since the amplification is programmable over
a wide range and a series of switchable auxiliary func
tions are provided.
The interface board is available in two versions:
Universal Interface Board
Half Duplex Interface Board.
HAGEUN-CRYPTOS
3B866
CRYPTO AG 3_2
3.1.1.1 Universal Interface Board
This board contains the following function
groups:
- 4 transformers for the following signals
AFT
TX
RX
AFR
Plain input signal
Crypto output signal
Crypto input signal
Plain output signal
- 4 variable gain amplifiers for the signals
AFT, TX, RX, AFR.
- Input filter for RX signal
- Switchable AGC (automatic gain control)
circuitry for RX signal
- Off-hook detector
- VOX detector and control logic for echo
suppression
- Signal detector for plain-override function
- Switchable microphone supply
- Optical interface for the input control-signals
LACT: Line active criteria
AUX IN: Push-to-talk criteria, or supplementary
plain/crypto switching
- Relay switch contacts (AUX 1, AUX 2, AUX 3) for
transmit and receive control, or for external
P/C display.
- Switching for plain-override and self-test.
HAGEUN-CRYPTOS
3B866 CRYPTO AG 3_3
3.1.1.2 Half-Duplex Interface Board
This board contains the following function
groups:
- 4 transformers for the following signals:
AFT
TX
RX
AFR
Plain input signal
Crypto output signal
Crypto input signal
Plain output signal
- 4 variable gain amplifiers for the signals
AFT, TX, RX, AFR
- Input filter for RX signal
- Signal detector for plain-override.
- Switchable microphone supply
- Optical interface for the input control-
signals
LACT: Line active criteria
AUX IN: Supplementary plain/crypto, switching
or receive criteria (squelch) for
plain-override.
- PTT: Pus h-t o-talk crite ria .
- Relay switch contact (R/T, R/T(0) ) for
transmit/receive control
- Relay switch contacts (AUX1, AUX2, AUX3)
for external P/C display.
HAGEUN-CRYPTOS
CRYPTO AG
3B866 3-4
3.1.2 FILTER/MIXER BOARD
The analog signal processing is carried out
on this board. The board contains the
following function blocks:
For cipher process
- AGC circuitry
- Filter/mixer group for division into sub-
bands
- Sampling and parallel/serial conversion of
the sub-band samples
For decipher process
- Serial/parallel conversion of the sub-band
samples
- Filter/mixer group for assignment of sub-bands
into their original frequency domains
- Addition stage for sub-band signals and side
tone.
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