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61280004L2-1C
Section 2 Installation
Three loopback functions are provided for diagnostic capability of each E1 interface. The local line
loopback (Loop 1 as illustrated in Figure 2-1) loops the incoming E1 signal back out at the E1 framer.
The remote link loopback (Loop 3 as illustrated in Figure 2-1) 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 (Loop 2 as illustrated in Figure 2-1) allows the local unit to loop E1 data back towards the
remote end. The available loopback functions are illustrated in Figure 2-1.
E1
LINK PLANNING
The appropriate transmitter power must be calculated as part of the link planning.
The factors that must be taken into account when planning a link are optimal received signal level,
transmitter power, antenna feedline loss (each end), antenna gain (each end), free space path loss, and
required fade margin.
The optimal signal level for the receiver is -60 dBm.
14
1
2
RF Link
Local
Figure 2-1. E1 Loopback Locations
I M P O R T A N T
I M P O R T A N T
3
E1
Remote
TRACER 2 x E1 User's Manual
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