Multi-Tech Systems FR111 - Manual (Page 67)

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Loop Tests
The loop tests provide a short and long loop test. The short loop test is the
data port loopback test which loops back the data from the data port to the
sending device (DTE). The long loop test is the trunk loopback test which
again receives data from the DTE device and loops it back from the internal
DSU.
The data port loopback test has two modes which depend on the device
connected to the data port. If the data port device is an async device, then
the Command Mode switch (DIP-Switch position 1) can be in either position
in order for the data to be looped back to the sending (DTE) device. If the
data port device is a sync device, the Command Mode switch must be in the
up position (Data mode) in order for the device to receive the looped back
data.
The trunk loopback test requires that DIP-Switch position 3 (Loopback Test
Mode) be in the DOWN position in order for the internal DSU to loop back
the data received from the DTE device.
Other Tests
The memory test checks the on-board memory. A warning will be displayed
that "The unit will be reset now and the factory defaults will be restored.
The watch dog test will reset the unit. A "Warning: This watchdog test will
reset the unit. Do you wish to continue?" A brief message will be displayed
stating that the watch dog test passed.