Sangoma T3 Mux M13, User Manual, Page: 23 / 30

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1. Control of Local and Line Loopback in Framer (Digital Interface).
2. Control of Local and Line Loopback in LIU (Analog Interface).
When a T1 Local Loopback is enabled, all data that is output by the Transmitter will be routed to the Receiver.
Local Loopback is illustrated on Figure 3.3.3-1.
Figure 3.3.3-1.
When a T1 Line Loopback is enabled, all data that is received will be output to the Transmitter.
Line Loopback is illustrated on Figure 3.3.3-2.
Figure 3.3.3-2.