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OM20 Universal Outdoor Modem
2.4
Mounting and Wiring Considerations
The OM20 should be mounted with the BUC higher than the OM20 with the interconnecting
communication cabling and power cords at the lowest possible position. Unit weight and
cable/waveguide length should be considered when selecting the mounting location
The following diagrams should be used as a reference to the various mounting options. The
OM20 should not be placed immediately above a high-heat or EMI (Electro-Magnetic
Interference) source to ensure the output signal integrity and proper receive operation. Figures
2-3 through 2-11 illustrate the different interconnect and data interface configurations for the
OM20.
MONITOR AND
CONTROL
SYSTEM
EIA - 530
DATA / M & C
ETHERNET
ROUTER
DATA / M & C
MN-OM20– Revision 5
Figure 2.2a. OM 20 Rear Interconnects (cont)
PRIME POWER
110 / 220 VAC
50 / 60 Hz
J 1 AC POWER
3 P
J 2 232 / 485 M & C / TERMINAL
18 P
J 3 EIA - 530 INTERFACE
38 P
J 4 ETHERNET DATA / M & C
RJ 45
J 10 SD ( DDI )
BNC
J 11 RD ( IDO )
BNC
UNBALANCED
G . 703 DATA I / O
Figure 2-3. Outdoor Modem (OM) Interconnect Diagram
OM - 20
TX OUTPUT J 8
N
RX INPUT
J 7
N
Installation
TXRF L - BAND
950 – 2050 MHz
TO BUC / SSPA
10 MHz /+ 24 VDC
RXRF L - BAND
950 – 2050 MHz
FROM LNB
+ 18 VDC
2–4
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