Philips SPENDEX 40 Maintenance Manual page 27
Speech encryption decryption equipment
Hide thumbs
Also See for SPENDEX 40:
- Operating manual (25 pages) ,
- Operating instructions manual (21 pages)
Table of Contents
Advertisement
■
-
-
-
'
-
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
4 . 1 0 Te l e p h o n y b o a r d
4 . 1 0 . 1 D i a l l i n g t o n e g e n e r a t o r
Via the line output amplifier on the line interface board the
dialling tones (TD) are put on the line. Moreover the dialling tones
are directed to the telephone amplifier on the connecting board.
During the transmission of the dialling tones the microphone signal
INTIN is blocked.
4 . 1 0 . 2 D i a l l i n g p u l s e g e n e r a t o r
The dialling pulses are put on the line via relays RE2 or RE3 on the
line interface board: in 2-wire connection via relay RE2 and in
4-wire connection via relay RE3. During the transmission of dialling
pulses on hook relay RE1 of the line interface board is energised.
4 . 1 0 . 3 A n s w e r i n g t o n e d e t e c t o r
This detector detects the reception of an answering tone of 2025 Hz
or 2100 Hz. At the reception of an answering tone the signal ANSWER
i s a c t i v a t e d .
4 . 1 0 . 4 P r e - e m p t i o n s i g n a l d e t e c t o r
This detector passes a received pre-emption signal (420 Hz) on to the
telephone amplifier on the connecting board. At the reception of a
pre-emption signal the signal PREMPT is also activated.
4 . 1 0 . 5 O n / o f f - h o o k d e t e c t o r
The on/off-hook detector detects the putting down and the picking up
of the handset. When the handset is picked up the signal H00KSW is
low and when it is put down the signal HOOKSW is high. In the latter
case also a reset pulse ONH is given to the alarm circuit on the key
generator board.
4 . 1 0 . 6 I n t e r n a l - l o o p s w i t c h e s
For test purposes the comsec controller can activate the
internal-loop switches by means of the DATLP-signal. As a result of
this the data signal TXD, which comes from the parallel/series
converter on the transmitting side, is connected through to the
series/parallel converter on the receiving side.
9 9 2 2
1 5 4
1 3 4 3 1
4 - 1 3
NATO CONFIDENTIAL
Advertisement
Table of Contents
