Hagelin-cryptos HC-250 User Manual

HAGEUN-CRYPTOS

CRYPTO AG

3B866

CRYPTOCOiVP HC-250

INSTALLATION INSTRUCTIONS

HAGEUN-CRYPTOS

3B866

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.

"

HAGEUN-CRYPTOS

3B866

CRYPTO AG

TABLE OF CONTENTS

Page

1, GENERAL 1-1

1.1. DESCRIPTION OF THE EQUIPMENT

1.2. PRINCIPLES OF OPERATION

1.3. KEY HIERARCHY

1.4. MECHANICAL CONSTRUCTION

1.4.1.

1.4.2.

1.4.3.

1.5.

REMOTE CONTROL UNIT
BASIC UNIT
PORTABLE VERSION

ACCESSORIES

i-i
1-2
1-3
1-5
1-5

1-5
1-5
1-6

2,

2.1.

2.2.

2.3.

2.4.

2.5.

2.6.

2.7.

2.8.

2.9.

2.10.

TECHNICAL DATA

AUDIO INTERFACE
COMMUNICATION INTERFACE
TRANSMISSION DELAY
SIGNALLING

SYNCHRONIZATION
CHANNEL REQUIREMENTS
CRYPTOLOGICAL DATA

POWER SUPPLY
ENVIRONMENTAL
DIMENSIONS AND WEIGHT

3, SYSTEM DESIGN

3.1.

3.1.1.

3.1.1.1.

3.1.1.2.

3.1.2. FILTER/MIXER BOARD

3.1.3. CODER BOARD

3.1.4. MICROPROCESSOR BOARD

3.1.5.

3.1.6.

3.1.7.

3.1.8.

3.1.9.

3.2. SIGNAL LIST

DESCRIPTION OF PCB FUNCTIONS

INTERFACE BOARD

Universal Interface Board
Half-Duplex Interface Board

MEMORY BOARD

DIGITAL INTERFACE BOARD

POWER SUPPLY BOARD
FRONT PANEL
REMOTE CONTROL UNIT

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

HAGEUN-CRYPTOS

3B866 CRYPTO AG -II-

Page

4 . I N T E R F A C I N G P R I N C I P L E S ^

4 1

411

4. 1 2
4 1 3

4 1

4

1 .5

4 2
4 3

4

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 T A 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

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

A.1.1
A.1.2

A.1.3
A.1.4. Customer Specific Programming of the Key Input

A.1.5. customer Specific Programming of the Structure Key Al-4

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

Identification Code Al-3

HAGEUN-CRYPTOS

3B866 CRYPTO AG -IV-

RES

FIGU

Fig.
Fig.
Fig.
Fig.
Fig.

Fig.
Fig.

Fig.
Fig.

1.1.

1.2.

1.3.

1.4.

1.5.

3.1.

3.2.

4.1.

4.2.

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)

Fig.

4.3.

INTERFACING TO HALF-DUPLEX RADIO (USING UNIVERSAL
INTERFACE BOARD)

Fig.

4.4.

INTERFACING TO HALF-DUPLEX RADIO (USING HALF-DUPLEX
INTERFACE BOARD)

Fig.

4.5.

INTERFACING TO HALF-DUPLEX RADIO (WIRING OF MAIN

FUNCTION)

Fig.
Fig.

Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.

Fig.

4.6.

4.7.

4.8.

4.9.

4.10

4.11

4.12

4.13

4.14

4.15

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

1

'

"

"

Fig.
Fig.
Fig.
Fig.
Fig.
Fig.

Fig.
Fig.

Fig.
Fig.
Fig.

Fig.
Fig.
Fig.

Fig.
Fig.
Fig.

Fig.

5.1.

5.2.

5.3.

5.4.

5.5.

5.6.

5.7.

5.8.

6.1.

6.2.

6.3.

6.4.

6.5.

6.6.

6.7.

6.8.

6.9.

6.10

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 half­duplex 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 str e a m g e ner a t o r s i gn a l s . The s e g m e n ta t i o n y i el d s a v a r i ety 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 Mou nt ing Hard wa re

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.

•

HAGEUN-CRYPTOS

3B866

2.

2.1

TECHNICAL DATA

AUDIO INTERFACE

Input

Output

Impedances

Frequency Range

Microphone DC-Supply

CRYPTO AG

2 mV - ,.. .1.5 V ,,, floa ti ng

10 mV

300^/200^

350...3000 Hz

15V, 30 mA, floating

eff eff a

,, ... 1.5 ,,, floating

eff eff 3

2-1

2.2. COMMUNICATION INTERFACE

Input

Output

Impedances

Frequency Range

2.3.

TRANSMISSION DELAY (END TO END)

Standard Operation 314 ms

With Enhanced Duplex Comfort 130 ms

10 m V ,,. ..1 .5 V , ,, flo ati ng

2 mV ,,. ..1 . 5 V , , , flo ati ng

eff eff 3

300n /200fi

640...2880 Hz

user selectable

)

2.4.

SIGNALLING

Frequencies

1302 /1736 Hz
1085 /I 519 Hz
1519 /1953 Hz

user s e le ct a bl e

)

HAGEUN-CRYPTOS

3B866

2.5

SYNCHRONIZATION

Initialization Time:

Tracking:

Maximum Time of
Line Interruption:

2.6. CHANNEL REQUIREMENTS

CRYPTO AG

2-2

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

Transmission Bandwidth

- Standard operation

- with Slightly Reduced
Voice Quality

Transmission Loss:

Signal to Noise Ratio

Frequency Drift

2.7. CRYPT0L0GICAL DATA

Customer Specific
Parameter:

Structure Key:

Communication Key:

600...2900 Hz

600...2400 Hz

< 30 dB

> 10 dB

< 100 Hz

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

8 keys with a diversity of 10 each

32

Message Key:

User Identification Code:

Key Input Identification
Code:

Diversity of 6.5 x 10 , automatically

4

generated

up to 8 digits

up to 8 digits

HAGEUN-CRYPTOS

3B866

2.8. POWER SUPPLY

DC Supply:

AC Supply:

Consumption:

Fusing:

2.9. ENVIRONMENTAL

Storage Temperature:

Operating Temperature:

CRYPTO AG

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)

- 20° ... 80° C

- 10° ... 60° C

2-3

Vibration: 2.5 g, 7 ... 200 Hz

Shock: 30 g, 11 ms

Electromagnetic Compati

Conducted and Radiated
Emission:

Radiation Susceptibility:

10 kHz ... 30 MHz AM

30 MHz ... 1 GHz FM

2.10. DIMENSIONS AND WEIGHT

Basic Unit

bil

ity

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)

78 x 225 x 256 mm

4.2 kg (3.2 kg without AC supply module)

Remote Control Unit:

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.

- PT T: P us h- to-ta lk cr iteri a.

- 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

\

3B866 3-4

CRYPTO AG

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 sub­bands

- 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.

HAGEUN-CRYPTOS

3B866

CRYPTO AG

3-5

3.1.3 CODER BOARD

All the analog/digital (A/D) and digital/analog
.(D/A) conversions for the voice and cipher signals

respectively are carried out on this board. In
addition this board includes the receiver for the

synchronization signal.

This card contains the following function groups:

- A/D and D/A converters for the ciphering process

- A/D and D/A converters for the deciphering process

- Digitally controlled amplifiers for cipher signal.

- Anti-aliasing and interpolation filter for transmitted
and received cipher signal.

- FSK receiver and detector for synchronization and tracking

signal.

- Detector for plain override.

3.1.4 MICROPROCESSOR BOARD

This board is the centre of the digital signal pro
cessing. In addition to the central processing unit

(CPU) and its associated hardware, the board con

tains the oscillator and phase correction circuitry

which determines the clock for the ciphering and

deciphering process. The board contains the following
function blocks:

- Microprocessor

- Auxiliary circuitry: voltage supervision, interrupt

- Address decoder.

control, error control.

- Quartz oscillator.

- Frequency dividers.

- Phase correction circuitry.

'

HAGEUN-CRYPTOS

3B866 CRYPT0 AG 3-6

3.1.5 MEMORY BOARD

The memory board contains the following function
blocks:

- Working memory (RAM)

- Programme memory (EPROM)

- Address decoder

3.1.6 DIGITAL INTERFACE BOARD

1

This board contains the interface for the control
and data signals which are exchanged between the

processor system and the various function blocks
as well as the remote control unit. In addition

to the frequency preparation for the analog signal
processing, this board includes the key memory

with the back-up battery. The board consists of
the following function blocks:

- Universal asynchronous receiver/transmitter

(UART) for data transmission from and to the

rpmnt.p rnnt.rnl unit.

remote control unit

- Input/output sections for the control signals

- Memory with back-up battery for key and operating

parameter storage

- Address decoder

- Various frequency dividers

- Control circuitry for automatic power on/off

3.1.7 POWER SUPPLY BOARD

T h e p o w e r s u p p l y b o a r d s u p p l i e s a l l t h e s u p p l y m

voltage for the system, i.e.

- + 5 . 2 V

- + 7 . 5 V

- - 7 . 5 V

- + 15 V for microphone supply

- + 5 V for stand-by operation

The input voltage can be within the limits 9 to
30 V DC.

HAGEUN-CRYPTOS

3B866 CRYPTO AG 3"7

3.1.8 FRONT PANEL

The transformer and rectifier circuitry are located
on the front panel and are used to convert the AC

supply to a DC supply for the power supply board

(Ref. para 3.1.7). The back panel is connected to
the front panel via the connecting board which con
tains the DC fusing and over-voltage protection.

3.1.9 REMOTE CONTROL UNIT

All the operating functions of the HC-250 are carried

out using the remote control unit. The display allows
the operator to check input commands and shows the

operating status of the cipher system.

The unit contains the following function

blocks:

- 8 position display

- Keyboard (14 keys)

- Mechanical lock

- Optical interface, for use when entering key
information with a key gun.

- UART for exchange of data with digital
interface board

- Encoder and decoder circuitry