User's Manual Part 5

ROI-S05751 CORRECTIVE MAINTENANCE
5-13
Chart 5-1 Loopback Control
Step Procedure
For the LCT operation, refer to Chapter 6 of LCT Operation in
Appendix of this Section IV.
This chart contains:
A. Preparation
B. IF Loopback Control
C. Main Loopback (Near End) Control (SONET)
D. Main Loopback (Far End) Control (SONET)
If loopback operation is performed, timing loop may occur (timing loop is
described in ITU-T Recommendation G.781).
Step Procedure
Caution: The Loopback control affects the radio link connection.
1. Loopback control operation is not performed at the
same time, or perform the Loopback reset control
and perform either Loopback mode.
• IF Loopback
• Near End Loopback
• Far End Loopback
2. Loopback operation is not performed with an
opposite station simultaneously.
3. Far End Loopback control will be canceled when
radio link failure occurs under the control has been
executed.
A. PREPARATION
1 Set up the BER measurement, (refer to Fig. 5-3)
2 Connect the LCT port and the USB port with a USB cable, (see
Fig. 2-2 in Chart 2-2)
3 Login LCT with User name “Admin” and Admin password,