User Manual

Exalt Communications, Inc.
Exalt i-Series Installation and Management Guide
5000001 71
2007-06-25
Figure 28 E1 Interface Configuration page (standard models)
T1/E1 Loopback
Loopback is provided for any enabled T1 or E1 port. As shown in Figure 29 and Figure
30, the choices are:
• No Loopback (default)
• External (local)
• External (remote)
• Internal
Note: Only one Internal loopback can be enabled at any time.
All loopback configurations control the loop at the Line Interface integrated circuit,
which is the device wired directly to the front panel ports.
External loopback modes are used in conjunction with an external test source. The
designation of ‘local’ or ‘remote’ refers to where the loopback is occurring relative to the
location where the loopback is implemented. That is, on the radio being accessed, if
External (remote) is selected, this loops the signal back at the remote radio interface back
towards the local radio. Likewise, if External (local) is selected, the signal loops back at
the local interface towards the remote radio (Figure 29 and Figure 30).