User Manual

Exalt Communications, Inc.
Exalt i-Series Installation and Management Guide
5000001 72
2007-06-25
Figure 29 External (remote) loopback
Figure 30 External (local) loopback
When a local T1/E1 port is configured for External (remote) loopback, it is the same as
configuring the remote radio for External (local) loopback.
Internal loopback uses an internal test source, and sends the test source signal across the
link, looped at the remote radio’s interface, returned to the local radio, and looped at the
local radio’s interface back to the source. The inputs at both ends are looped back at the
line level. Figure 31 illustrates the internal loopback function.
Figure 31 Internal loopback
LOCAL
REMOTE
IN
OUT
OUT
IN
LOCAL
REMOTE
IN
OUT
OUT
IN
LOCAL
REMOTE
IN
OUT
OUT
IN