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T1/E1 and Digital Voice Modules Passport 4400 Hardware Installation Manual
9-5
75 Ω Outer Conductor Strapping
The outer conductors of the 75 Ω BNC interface connectors may be connected to
earth or isolated. Strapping is implemented by a set of headers and jumpers as
shown in the following figure.
Figure 9-7. Location of the E1 Interface Line Straps
75 Ω Connector Outer Conductor Jumper
Connector To Earth Isolated (Open)
Line 1 Rx (DSX-1) Place jumper over
E83, pins 1 and 2.
Place jumper over
E83, pins 2 and 3.*
Line 1 Tx (DSX-1) Place jumper over
E78, pins 1 and 2.*
Place jumper over
E78, pins 2 and 3.
* Indicates factory default setting
1
2
3
EARTH
OPEN
E83
E78
Fron
t o
f E
1 A
cces
s M
odule