Applications - Comtech EF Data UT-4500 Series Installation And Operation Manual

UT-4500 Series C- and Ku-Band Up Converters MN/UT4500.IOM
Introduction Revision 3

1.2.1 Applications

The UT-4500 is an Up Converter. It translates the input IF frequency from 52 to
88 MHz (or, optionally, from 104 to 176 MHz) to an output RF frequency. The
UT-4500 operates over the RF frequency range with a typical gain of 35 dB. The
RF output level is +10 dBm @ 1 dB compression. This permits longer cable runs
and compensates for splitting networks without requiring options such as
external line amplifiers.
The phase noise performance exceeds the Intelsat phase noise mask for IBS and
IDR services by more than 9 dB. This allows high capacity earth stations to add
more demodulators and still meet transmission standards. The close-in phase
noise is also very low. This makes the converter ideal for low bit rate digital
circuits such as those used in DAMA hub earth stations.
Depending on the application, the converter chassis rear panel module slot
accepts an Input/Output Module (IOM), Polarity Switch Module (PSM), Transmit
Switch Module (TSM), Equalizer Module (EQM), or Receive Switch Module (RSM).
The converter RF, IF, and High-Speed Bus (HSB) connectors are integral to the
installed module.
Non-redundant (also called standalone or single thread) units employ an IOM for
switching the RF output. The IOM is also used for unit testing.
In redundancy applications, where converters are "Daisy Chained" to provide
distributed online protection switching to a backup converter (BU), a TSM is used
in place of an IOM. The TSM contains RF and IF transfer switches. Type 'N' female
connectors are provided for the RF loop, and 50Ω or 75Ω BNC female connectors
are provided for the IF loop.
The "Daisy Chain" configuration is designed to chain the IF input and RF output of
up to twelve (12) online converters through TSMs terminating in a BU. When a
fault occurs in an online converter, the TSM in the faulted converter is
commanded to switch to the BU.
The BU in the "Daisy Chain" communicates with the online converters through
the installed module's High Speed Bus (HSB data interface). When faults are
detected, the BU reconfigures itself to replace the faulted online converter. The
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