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
Protected terminals | 153
11. Protected terminals
Monitored Hot Stand By (MHSB)
This section describes configuring the protected terminal in MHSB mode. A protected terminal in
MHSB mode comprises two radios interconnected using the tributary and RF switches as shown
below:
The MHSB switch protects terminals against any single failure in one radio. It also monitors the alarm
output of each radio and switches between radios if major radio link alarms occur.
The MHSB switch uses a CPU to monitor the alarm status received from both the connected radios'
alarm ports. When a relevant major radio link alarm is detected on the active radio (that is, transmitter,
receiver, power supply or modem), the CPU switches a bank of relays that switches all the interfaces
and the transmit port from the main radio to a functioning stand-by radio. The stand-by radio now
becomes the active radio.
The tributary switch and the RF switch are both a 19-inch rack-mount 1U high chassis. The total rack
space required is 6U. The MHSB switch option is available for the following bands: 300, 400, 700, 900,
1400, 2000, and 2500 MHz.