User Manual Part 1

Lynx.GX Installation and Management
Link Testing
Link testing is the preferred way to evaluate a radio link's performance. It can be performed from end-to-end or
in link test mode (which tests both directions of the radio path). The following figure illustrates a typical test
configuration (which may include the radio’s path instead of in-line attenuators).
Figure 2. Link Testing
When performing testing, verify all configuration settings.
Note: If link testing indicates an unacceptable level of errors, see the instructions in “RF Link Alarms” on page
95.
Several built-in loopback functions are implemented in the radio. They are:
Local LB
Local radio line interface is in loopback to the line connector (does not test the wireless link). This is useful
for external equipment or circuit testing, including an external BER tester.
Remote LB-int
The far end or remote radio is set to loopback data. The radio uses an internally generated signal and
external signals are ignored. This is useful for testing the entire radio link without using external test
equipment.
Remote LB-ext
Similar to Remote LB-int, but an external T1/E1 signal is required locally. This is useful for testing the entire
radio link and includes testing the physical connector to which the external test equipment is connected.
Running this test on every interface from both ends of the radio link would completely test every interface
connector and the complete radio link.
Figure 3. Loopback Mode
Chapter 2. Installing the IDU and RFU 13