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OM20 Universal Outdoor Modem
For a system operating at a maximum temperature of 50°C, a total maximum cable length of 88
meters should be used (100m - (0.4 x (50-20))).
Commercially available Cat 5e cable should not be used due to cable elongation during IFL
installation that can cause excessive signal loss and delay, and exposure to the outdoor
environment that will degrade the outer jacket of the cable exposing the inner conductors.
Since the OM20 operates outdoors, an outdoor rated CAT 5e cable such as Belden 7923A that is
UV and Oil resistant with a heavy industrial grade jacket should be used. This cable can also be
requested if specified and ordered with the OM20. Additionally, shielded cable such as Belden
7929A can be used where EMI issues are a concern.
5.0.5 Ground Lug (J6)
An external chassis ground post is located on the OM20 (J6 GND), requires a #10-32 threaded
stud (Note: this is for external grounding, and should not be used to ground the AC power Source
on J1
5.0.6 RX L-Band IF (J7)
The Receive L-Band Input Port is a 50-Ohm N-Type Female Connector that is used for the L-
Band IF/DC/Reference connection to/from the LNB. The IF Frequency can be programmed from
950 to 2050 MHz in 1 Hz Steps via the GUI or Remote interface. The DC is range selectable
from 13, 15, 18, or 20 VDC and can be enabled or disabled via the GUI or remote interface. The
10 MHz reference can also be enabled or disabled from the GUI or Remote interface.
5.0.7 TX L-Band IF (J8)
The Transmit L-Band Output Port is a 50-Ohm N-Type Female Connector that is used for the L-
Band IF/DC/Reference connection to the BUC. The IF Frequency can be programmed from 950
to 2050 MHz in 1 Hz Steps via the GUI or Remote interface. The DC is range 24 VDC (optional
48VDC is available) and can be enabled or disabled via the GUI or remote interface. The 10
MHz reference can also be enabled or disabled from the GUI or Remote interface.
5.0.8 Compact Flash Card (J9)
The compact flash slot is located on the left side as viewed from the front of the unit behind the
small weatherized panel. This must be present while the unit is operating. Files on the flash are
defined by Radyne Corp.
5.0.9 SD (J10) (Optional)
Based on unit configuration, this connector is used for either G.703 Unbalanced Transmit Send
Data (Drop Data In) or for ASI data in depending on the optional interface ordered. The
connector is a 75-Ohm Female BNC Connector.
5.0.10 RD (J11) (Optional)
Based on unit configuration, this connector is used for either G.703 Unbalanced Receive Data
(Insert Data Out), or for ASI data out depending on the optional interface ordered. The connector
is a 75-Ohm Female BNC Connector.
TM116 – Rev. 1.2
Rear Panel Interfaces
5-7
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