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
In-service commissioning | 173
Checking the link performance
For a graphical indication of the link performance, you can use the constellation analyzer.
The 'dots' are a graphical indication of the quality of the demodulated signal. Small dots that are close
together indicate a good signal. If the dots become spaced further apart, this indicates that the signal
quality is degrading. This signal quality degradation can be caused by low Rx signal level due to, for
example:
external interference
failure of any of the following: modem, receiver, far end transmitter, an antenna (either end), a
feeder or connector (for example, due to water damage)
path issues such as multi-path fading or obstructions
To check the performance of the link using the constellation analyzer:
1. Select Link or Local or Remote > Performance > Constellation.
A blank constellation diagram appears:
2. Click Start to start the constellation analyzer.
While the constellation analyzer is running, the terminal will temporarily stop collecting error
performance statistics. If you want to run the constellation analyzer anyway, click OK when you
see this warning message:
3. Click Stop to stop the constellation analyzer.
The terminal automatically resumes collecting error performance statistics.