Philips SPENDEX 40 Maintenance Manual page 11

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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
3 . 1 . 7 K e y g e n e r a t o r b o a r d U A 8 3 2 0 / 0 0
The key generator board contains:
- the series/parallel converter for the data signal to be encrypted
originating from the Data Terminal Equipment
- the key generators transmitting side (PKG/CKG)
- the parallel/series converter for the data signal to be transmitted
- the series/parallel converter for the received data signal
- the key generator receiving side (RKG)
- the parallel/series converter for the decrypted data signal
destined for the Data Terminal Equipment
- the alarm circuit
3 . 1 . 8 C o n t r o l l e r b o a r d U A 8 3 1 9 / 0 0
The controller board contains:
- the comsec controller
- program memory 1 (M EPROM)
- the data memory red
- the data memory black
- the address decoder
- t h e i n t e r r u p t c i r c u i t
3 . 1 . 9 T i m i n g b o a r d U A 8 3 1 8 / 0 0
The timing board contains:
- the time base
- timer long
- timer short
- the alarm and power-on reset circuit
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3 . 1 . 1 0 T e l e p h o n y b o a r d U A 8 3 1 7 / 0 0
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The telephony board contains:
- the dialling tone generator
- the dialling pulse generator
- the 2025/2100 Hz answering tone detector
- the 420 Hz pre-emption signal detector
- the on/off-hook detector
- internal-loop switches
3 . 1 . 1 1 V 2 6 / V 2 6 b i s m o d e m U A 8 3 1 4 / 0 1
ONLY IN EQUIPMENT TYPE UA 8251/00
The V26/V26bis modem modulates the signal to be transmitted and
demodulates the received signal according to CCITT-recommendation
V26/V26bis.
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NATO CONFIDENTIAL