Motorola PTP 600 Series User Manual page 94

Telecoms Interface: May be either T1, E1 reflecting the Installation Wizard setting.
Line Code: Displays the Line Code setting for each channel. The Line Code configuration
must match the configuration of the connected equipment and may be set using the
Installation Wizard.
Cable Length: The Cable Length setting is applicable in T1 mode only and shows the cable
length specified in the installation wizard.
Loopback: Allows the T1 or E1 data stream to be looped back at the copper or wireless
interface. During normal operation the loopback must be set to "None".
It may be helpful during installation to test the telecoms links by performing loopback
connections.
A "Copper" loopback connects the received data on a given telecoms interface to the
transmit. A "Copper" loopback may be used, in conjunction with an appropriate test unit, to
confirm that the correct connections have been made to the ODU.
A "Wireless" loopback sends the telecoms data received across the wireless link back across
the link on the same channel. The link may be checked using, for example, a Bit Error Rate
Tester.
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.
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