G E N E R A L; T E C H N I C A L D E S C R I P T I O N; M E C H A N I C A L C O N S T R U C T I O N - Philips SPENDEX 40 Maintenance Manual

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NATO CONFIDENTIAL
S P E N D E X 4 0 U A 8 2 5 1 / 0 0 A N D / O l L I M I T E D M A I N T E N A N C E M A N U A L
1 I N T R O D U C T I O N
1 . 1 G e n e r a l
This manual contains instructions for the limited maintenance of the
speech encryption/decryption equipment SPENDEX 40, types UA 8251/00
and UA 8251/01. The fault finding and repair procedures are
restricted to the location and replacement of defective exchangeable
u n i t s , i f a n y.
1 . 2 T e c h n i c a l d e s c r i p t i o n
The speech encryption/decryption equipment SPENDEX 40 is an apparatus
with which it is possible to achieve secure communication (speech and
data) via telephone lines and radio contacts. For secure
communication via telephone lines the apparatus is provided with an
internal line modem, whereas for secure communication via radio
contacts a special radio modem need to be connected. The SPENDEX 40
can also be used as a normal telephone for nonsecure communication.
SPENDEX 40 can operate in Pulse Dialling and Tone Dialling mode. With
an appropriate network it is possible to set up in the Tone Dialling
mode a connection with a certain precedence level. In this case a
choice can be made of 4 different levels, viz. priority, immediate,
flash and flash override.
SPENDEX 40, type UA 8251/00, is equipped with a V26/V26bis modem.
With an apparatus of this type it is possible to achieve secure
communication in the 2-wire Half Duplex or in 4-wire Full Duplex
transmission mode. A type UA 8251/00 apparatus can operate in the Net
and KDC mode. In the KDC mode and in the NET mode, but only with a
key variable in compartment 00, an apparatus can cooperate with a
STU-II unit (Secure Telephone Unit, second generation).
SPENDEX 40, type UA 8251/01, is fitted with a V22bis modem. With this
type of equipment secure communication can be achieved in the 2-wire
Full Duplex transmission mode. An UA 8251/01 apparatus can only
operate in the Net mode.
Remark: equipment types UA 8251/00 and UA 8251/01 cannot cooperate
with each other in any mode whatsoever.
1 . 3 M e c h a n i c a l c o n s t r u c t i o n
SPENDEX 40 is a compact apparatus built up of modules and is
primarily designed for office use. For mobile use a shock mounting is
a v a i l a b l e .
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NATO CONFIDENTIAL