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61280004L1-1A
PAGE 19
INSTALLATION
The BNC configuration interface provides a 75Ω unbalanced
connection. The shield of the OUT coaxial connection is attached
to earth ground. A jumper is provided to optionally connect the
shield of the INPUT coaxial connection to ground as described in
G.703. This jumper is located on the inside of the E1 interface
board, between the two BNC connectors. The E1 module must
be removed to access this option.
The 15-pin / RJ-48 configuration interface provides a 120Ω
balanced connection.
Three loopback functions are provided for diagnostic capability.
The local line loopback loops the incoming E1 signal back out at
the E1 framer. The remote link loopback loops the E1 data back
to the local end from the remote end. This allows a BERT to be
run across the microwave link and back. The local link loopback
allows the local unit to loop E1 data back towards the remote
end. The available loopback functions are illustrated below.
E1
y,,y y,,y
1
2
Local
RF Link
3
E1
Remote
Figure 2-1. E1 Loopback Locations