Product specifications

UT-4500A Series Upconverters Revision 0
Introduction MN-UT4500A
1–5
! External Interface Connectors – Connectors are provided for operational
communications, connection of external reference, redundant operation, and remote
monitor and control of the UT-4500-A.
1.3 Theory of Operation
1.3.1 Applications
The upconverter operates over the RF frequency range with a typical gain of 35 dB. The RF
output level is +10 dBm at 1 dB compression allowing the capability for longer cable runs to
compensate for splitting networks without adding 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 upconverter
ideal for low bit rate digital circuits such as used in DAMA hub earth stations.
A selectable EIA-232C or EIA-485 remote control serial communications connector interface is
provided on the rear panel of the upconverter. All configuration control, status retrieval and
adjustments are available as ASCII commands through the serial interface, or as local operator
input command to the upconverter.
A detachable Input/Output Module (IOM) can be mounted in the rear of the upconverter chassis
for switching the RF output for single thread operations, or for testing the output of the unit. The
connectors for the IOM are located on the rear panel.
In applications where converters are "Daisy Chained" together to provide distributed online
protection switching to a backUpconverter, the IOM is replaced with a detachable Transmit
Switch Module (TSM). The TSM contains RF and IF transfer switches. Type N connectors are
provided for the RF loop, and 50 or 75 ohms BNC 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 together through TSM's terminating in a backUpconverter. When a fault
occurs in an online upconverter, the TSM in the upconverter with the fault is commanded to
switch to the backUpconverter.
The backUpconverter performs the fault detection, self-reconfiguration and the logical switching
functions. If the backUpconverter has a fault, it will not attempt to perform the protection-
switching task. If the backUpconverter does not have a fault, it will assume the frequency and
attenuation of the faulted online upconverter, and compensate for the chain losses.
The backUpconverter in the "Daisy Chain" communicates with the online converters through a
high speed (data interface) bus (HSB). When faults are detected, the backUpconverter re-
configures itself to replace the online upconverter with the fault. The backUpconverter also uses
the HSB to monitor configuration changes made to the online converters by either remote control
or front panel command inputs.