E L E P H O N Y B O A R; I N E I N T E R F A C E B O A R; S P E N D E X; B L O C K D I A G R A M S P E N D E X - 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
Jumper D
By means of jumper D the bit rate can be set on 1200 bit/s or
2400 bit/s.
B i t r a t e ( b i t / s )
Position of jumper D
1200
2400
D2-D1
not inserted
5 . 11 . 2 S e t t i n g b l o c k X 3
With jumper 1 and jumper 2 on setting block X3 the Data Clamp Delay
can be set on 4 different values.
Data Clamp Delay
Position of jumpers
Jumper 1 Jumper 2
6 /xs
4.17 ms ± 35 /xs
20.83 ms ± 35 /xs
104.17 ms ± 35 /xs
A l - B l
B l - C l
A l - B l
B l - C l
A2-B2
A2-B2
B2-C2
B2-C2
5 . 11 . 3 S e t t i n g b l o c k X 5
With the help of a jumper on setting block X5 it is possible to set
the output level of the modem from -12 dB...O dB in steps of 1.5 dB
Output level (dB)
Position of jumper
-12.0 1
-10.5 2
-9.0 3
-7.5 4
-6.0
5
-4.5
6
-3.0 7
-1.5 8
0.0
9
Remark: the level of the output modem signal can be accurately
adjusted with the help of potentiometer R18 on the line
interface board (see § 5.13.5).
9922 154 13431 5-3
NATO CONFIDENTIAL