Red Data/Digital Connector (J3); Red Digital Data; Red Analog Voice Interface - Motorola STU-III/R Operation, Installation, And Maintenance Manual

T a b l e 3 - 3 .
Red Analog Voice Interface
T R A N S M I T
A U D I O
( T X A U D )
R E C E I V E
A U D I O
( R X A U D )
P A R A M E T E R
1 1 1 d B S P L + 3 d B =
2.0 Vpp (max input
level, secure mode)
(<-20 dBm in clear
m o d e )
9 9 d B S P L + 3
dB =.22 Vpp
(max output at
n o m i n a l v o l u m e
l e v e l )
L e v e l
+ 0 . 5 d B f r o m 2 0 0 t o
3 2 0 0 H z
+ 3 d B f r o m 3 0 0
t o 3 6 0 0 H z
Frequency
Response
I n p u t
Impedance
6 0 0 o h m s + 1 0 %
< - 3 4 d B a t 1 0 0 d B D i s t o r t i o n
( S e c u r e M o d e )
S P L
< - 2 6 d B a t 1 1 6 d B
S P L
( S + N ) / N
> 5 5 d B
O u t p u t
Impedance
6 0 0 o h m s +
1 0 %
S i d e t o n e
Optional in
S e c u r e M o d e .
P r e s e n t i n
C l e a r M o d e
R E D D ATA / D I G I TA L C O N N E C TO R ( J 3 )
The red data/digital interface uses aDtype, 25-pin female RS-232C
compatible DCE connection that provides the Red Switch or other
ERC with the capability to secure digital voice and data
transmissions (see Figure 3-2). The red digital interface may be
configured for either red digital data or red digital voice operation.
Table 3-4 characterizes the signals on this interface.
Red Digital Data
Secure data can be transmitted to STU-HI equipments using STU-
III encryption or to another STU-HI/R or STU-HI/A using STU-II
Net encryption.
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