Crypto CRYPTOCOM HC-250 Installation Instructions Manual

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

1-6

2-1

2-2

2-3

3-1

3-2

3-3

3-4

3-5

3-6

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

4. 1 2

4 1 3

4 1

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

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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Crypto CRYPTOCOM HC-250 Installation Instructions Manual

Crypto CRYPTOCOM HC-250 Installation Instructions Manual

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