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ROSS
2.3
Installing the ROSS Unit
The ROSS is below-deck electronic equipment designed to mount flush in a standard 19-inch
equipment rack. Ensure that there is adequate clearance for ventilation, particularly on the top of
the unit. In rack systems where there is high heat dissipation, forced air-cooling must be
provided by top or bottom mounted fans or blowers. Under no circumstance should the highest
internal rack temperature be allowed to exceed 34ºC (95ºF).
Using a medium Phillips screwdriver, mount the ROSS in the designated rack space with four
rack screws. Always hand-tighten or use a low torque power driver to secure the front panel to
the rack rails. Note this is commercial grade manufactured equipment and it is recommended
that input AC power conditioning (online UPS) is provided.
2.4
ROSS, Modem, and ACU Connectivity
As shown in figure 1, the ROSS unit, MODEM (CDM-570L is shown in this example), and
ACU require several connections for data and signals. The installation and configuration of
the ACU hardware is beyond the scope of this document. Refer to the ACU vendor's
documentation for more detailed information regarding ACU installation.
2.4.1 Ethernet LAN Connections
ROSS and the MODEM (CDM-570L shown in figure 1) communicate via IP over Ethernet LAN.
This is illustrated in figure 1, where the ROSS and MODEM are connected to an Ethernet switch.
The ACU must supports IP over Ethernet and ROSS supports IP for selected ACU, the ACU
should also be connected to the LAN. Any host equipment, such as PCs, IP phones, should also
be connected to the LAN.
2.4.2 Modem to ACU/Antenna
The Tx input and Rx output IF signals from the modem need to be wired to above-deck antenna
equipment such as LNB and BUC. In some cases, the Tx and Rx IF lines require connection to
the ACU sub-panel interface. The ACU installation manual should be referenced for specific
vendor information.
2.4.3 Modem Tx Mute and Rx Lock Signal
A majority of commercial ACUs use the Rx Carrier Lock as part of the closed feedback system
in the satellite acquisition mechanism. In other words, the ACU will aim its antenna until the
modem locks onto its configured carrier. It is also extremely important to correctly connect the
modem Transmit carrier muting signal from the modem to the ACU. This hardware control line
provides the overriding control to mute the transmit carrier over any other software logic. Tx and
Rx controls are shown in Figure 1 and identified "Antenna HW CNTL". Consult the CDM
modem manual and ACU installation instructions provided by the ACU vendor for detailed
instructions.
Comtech EF Data, Vipersat Products
MN/13070
Page 16 of 87
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