Terrasat IBUC 2, Operation Manual

Page: 43 / 196

2-23
|
Cyber Hardened IBUC
2
, IBUC
2e
, IBUC
2 G
, IBUC
R
, IBUC
G
Operations Manual: Functional Description
Engineered to Endure
voltage, current consumption, phase - locked dielectric resonator oscillator
(PLDRO) lock voltage, input level and output level.
• Statistic History
A log of system core statistics is automatically gathered and maintained. This
resource can simplify troubleshooting of the system. For a complete list of which
variables are gathered, refer to command SHL on page C - 28 .
System Configurations
Figure 2.9 to Figure 2.11 show typical earth station installations using Terrasat block
upconverters. In normal operation, the IBUC and the low-noise block downconverter
(LNB) are mounted outdoors. Depending on the model of the IBUC, the PSUI can be
mounted indoors or outdoors. The IBUC and the LNB can interface directly with a
satellite modem, a 70 MHz to L-band rack converter or modem combiner network.
Table 2.10 lists the requirements for proper operation.
Certain considerations must be made when selecting the IFL because appropriate
shielding and signal levels are required for normal system operation. The IBUC is
designed to operate with a - 30 dBm Tx L-band input signal to achieve rated power at
maximum gain/minimum attenuation. The Cyber Hardened IBUC
2
, IBUC
2e
,
IBUC
2 G
, IBUC
R
or IBUC
G
provides a variable attenuator that is accessible
through the various M&C interfaces that enables the gain of the unit to be reduced by
up to 30 dB in 0.1 dB steps. The attenuator can be used to prevent overdrive to the
IBUC in configurations with a short cable run (or IFL), thus preserving the dynamic
range of the modem. In addition, the externally referenced IBUC and the externally
referenced LNB must have a 10 MHz input signal at +5 dBm to - 12 dBm for the
IBUC, and 0 dB to - 10 dBm for the LNB. The maximum voltage drop for a 24 VDC
IBUC is 4 volts and the maximum drop for a 48 VDC IBUC is 11 volts.
Table 2.10
Basic System Requirements
IBUC LNB
DC supply DC supply
~ from the modem ~ from the modem
~ from the outdoor PSUI 10 MHz reference signal
~ from the indoor PSUI ~ internally referenced
~ from the telecom station ~ externally referenced
AC supply ~ free running
~ AC mains RF input
10 MHz reference signal ~ from the antenna
~ internally referenced
~ externally referenced
L-band signal