Motorola PTP 500 Series User Manual page 118

A "Wireless" loopback sends the telecoms data received across the wireless link back across
the link on the same Telecom channel. The link may be checked using, for example, a Bit
Error Rate Tester to ensure that no errors are detected.
A typical T1 or E1 installation might include a "Copper" loopback on the local unit followed by
a "Wireless" loopback on the remote unit.
It is important to remove all loopbacks on channels for normal operation. Alarms on the
Home Page indicate the presence of loopbacks on either channel.
Lowest Telecoms Modulation Mode
The user defined lowest modulation mode at which telecoms data can be sent. If the link
cannot sustain telecoms data in this mode then the effective lowest modulation mode may
differ
Lowest Modulation Mode
The modulation mode at which telecoms data will be sent.
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