User's Manual
Table Of Contents
- 1. Getting started
- 2. Introduction
- 3. Preparation
- 4. About the terminal
- 5. Mounting and installing the terminal
- 6. Connecting to the terminal
- 7. Managing the terminal
- 8. Configuring the terminal
- 9. Configuring the traffic interfaces
- 10. Cross Connections
- Embedded cross connect switch
- The Cross Connections application
- The Cross Connections system requirements
- Installing the Cross Connections application
- Opening the Cross Connections application
- The Cross Connections page
- Setting the terminal's address
- Management and user ethernet capacity
- Setting card types
- Getting cross connection configuration from the terminals
- Creating cross connections
- Sending cross connection configuration to the terminals
- Saving cross connection configurations
- Using existing cross connection configurations
- Printing the cross connection configuration
- Deleting cross connections
- Configuring the traffic cross connections
- Cross connection example
- Symmetrical Connection Wizard
- 11. Protected terminals
- 12. In-service commissioning
- What you will need
- Checking the antenna polarization
- Visually aligning antennas
- Accurately aligning the antennas
- Synchronizing the terminals
- Checking performance
- Checking the receive input level
- Checking the fade margin
- Checking long-term BER
- Bit Error Rate tests
- Additional tests
- Checking the link performance
- Viewing a summary of the link performance
- What you will need
- 13. Maintenance
- 14. Troubleshooting
- 15. Interface connections
- 16. Alarm types and sources
- 17. Country specific settings
- 18. Specifications
- Ethernet interface
- QJET Quad E1 / T1 interface
- Q4EM Quad 4 wire E&M interface
- DFXO Dual foreign exchange office interface
- DFXS Dual foreign exchange subscriber interface
- QV24 Quad V.24 asynchronous data interface
- HSS Single high speed synchronous data interface
- External alarm interfaces
- Auxiliary interfaces
- AC Power supply
- DC Power supply
- Power consumption
- MHSB protection
- Ethernet interface
- 19. Product end of life
- 20. Abbreviations
- 21. Acknowledgments and licensing
- 22. Commissioning Forms
- 23. Index
Troubleshooting | 197
14. Troubleshooting
Loopbacks
Loopbacks are used as a tool for testing or as part of the commissioning process and will affect
customer traffic across the link.
The terminal supports three types of loopbacks:
RF radio loopback
Interface loopbacks, set at the interface ports
Timeslot loopbacks
RF radio loopback
The RF radio loopback provides a loopback connection between the radio Tx and radio Rx. Each
terminal is looped back independently.
All traffic entering the transmit stage of the local terminal is turned around and delivered to the receiver
section. This loopback will affect all traffic through the terminal.
To enable or disable the RF loopback:
Select Link or Local or Remote > Maintenance > Loopbacks.
To enable the RF loopback, click the RF Loopback checkbox (tick the box).
Note: An RF loopback will automatically disable after the period set (in seconds) in the Loopback
Timeout field. The default entry is 3600 seconds (60 minutes).
To disable the RF loopback, click the RF Loopback checkbox (untick the box).
Click Apply to apply changes or Reset to restore the previous configuration.
Note: When the RF loopback is selected, both the RX and TX LEDs will flash.