Product specifications

UT4500 Series Up Converter MN/UT4500.IOM

Remote Control Revision 2

4.2 BACKUP CONVERTER

The "Daisy Chain" terminates in the backup converter. The backup converter has a

microprocessor which performs fault detection, self reconfiguration and the logical

switching functions. If the backup converter does not have a fault, it will assume the

frequency and attenuation of the faulted converter and compensate for the chain losses.

This capability is accomplished through the operation of the High Speed Bus (HSB) and

the online converter detachable switch modules.

4.2.1 HIGH SPEED BUS (HSB)

In the "Daisy Chain" configuration, the backup converter communicates with the online

units through the high-speed interface bus (HSB). The backup converter is able to detect

faults and reconfigure itself to replace the faulted converter. The HSB interface is also

used in the backup converter to monitor configuration changes made to an online

converter. Changes in frequency, gain, or polarity are immediately entered into the

backup table as well as information from new online units. The high-speed bus does not

interfere with the remote serial communication link access to any of the converters in the

chain.

4.2.2 DETACHABLE MODULES

Comtech EF Data's converters are designed with a detachable Input/Output Module

(IOM) which contain the signal path connectors. The IOM is utilized for single thread

operation, or for testing of the unit.

For redundant "Daisy Chain" operations, the on-line up converters are provided with a

detachable Transmit Switch Module (TSM) replacing the IOM.

4.2.2.1 UP CONVERTER SWITCHING

Up converter switching is implemented with a detachable Transmit Switch Module

(TSM). The TSM contains IF and RF transfer switches for input/output looping of the

signal. Options for the TSM include SMA connectors for the RF output signal, and 50 or

75Ω BNC connectors for the IF.