User's Manual

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Document Number: 0100SM1401 Issue: 10-14
Operational Description
The QH Hot Standby Controller (QHHSC) unit is a 1RU rack mounted module that interfaces to two separate full duplex
radios (each 1RU rack mounted modules) via a number of RF and data cables.
Both full duplex radios (Radio A & Radio B) operate simultaneously and should both be constantly receiving radio signals,
however only data from one radio (the “online” radio) is directed to the user equipment. The online radio is also the only unit
transmitting at any time. The Hot Standby Controller has the following functions:
• Amplify and split the incoming signal two ways so both radio A and radio B receive at once.
• Monitor the alarm output from both radio A and radio B and change over the online radio if required.
• Switch all user data through to the online radio.
• Switch the antenna via internal coaxial relay to the online radio transmitter (Requires QHHSC Kit Option A).
Digital switching in the QHHSC directs user data to and from the user ports on the front panel directly to the user ports of the
online radio.
The QHHSC and the two full duplex radios will pass operational/alarm detection status between one another via the AUX
interface. Any alarm detection indicated from the online radio can cause the QHHSC to change over the online radio.
Mounting and Environmental Considerations
The QH450 hot standby full duplex radio is housed as a 3RU 19” rack mounted set, encompassing 2 x 1RU QB full duplex
radios and 1 x 1RU QH Hot Standby Controller. The Controller and full duplex radios are each supplied with x2 1RU mounting
brackets, which should be fitted to each sides of each unit before it can be installed into a 19” rack. The mounting brackets
can be fitted to the side of each unit in 3 different locations to provide different mounting capabilities: Front Mount, Proud
Mount or Center Mount. Refer to the QB450 Mounting guide for a graphical representation of the different mounting
positions.
The unit should be mounted in a clean and dry location, protected from water, excessive dust, corrosive fumes, extremes
of temperature and direct sunlight. Allow sufficient passive or active ventilation to allow the full duplex radio fans to pass air
through the internal heat sink efficiently.
All RF, power and digital I/O connections are made at the rear of the unit. All User interfaces are located at the front of the
unit, this includes: Ethernet interface, Serial COM port interfaces and Auxiliary interfaces.
Part F – Quick Reference Guide