Chapter 3 External Cables
When connecting the fiber, just make sure that signal receptions
and transmissions are consistent in both ends regardless of its
direction because of nondirectivity of the fiber.
External Dry Contact of
Baseband Subrack
The dry contact input/output cable connects the ZXSDR BS8900
to external environment monitoring system to receive dry
contact signals from external equipment and transmit dry contact
signals of the ZXSDR BS8900 .
The dry contact input/output cable is a balanced twist pair, as
shown in
Figure 44
.
F
IGURE
44 D
RY
C
ONTACT
I
NPUT
/O
UTPUT
C
ABLE
A
PPEARANCE
Table 31
describes dry contact input cable pins.
T
ABLE
31 D
RY
C
ONTACT
I
NPUT
C
ABLE
P
IN
D
ESCRIPTION
Sequence
Name
Signal De-
scription
Pin at End
A
Pin at End
B
1
Dry contact
input for
switch
signals
N/A
1
2
DRY_IN1–
Dry contact
input for
switch
signals
N/A
2
3
Dry contact
input for
switch
signals
N/A
3
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