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OM20 Universal Outdoor Modem
5.1.9 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.
5.1.10 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.
5.1.11 LED Indicators
There are two (2) Light Emitting Diodes (LED'S) on the front of the unit, Power and Alarm.
Whenever proper AC Power is supplied to the unit and the power supply is functioning normally,
this LED will be Green. If a Fault condition exists within the Power subsystem, this LED will be
RED indicating that service is required.
5.1.12 G.703 Balanced – Connections are available via the J3 connector.
Refer to Table 5.4a.
5.1.13 EXT Reference J12
The External Clock connector is optional and must be requested at time of order. This is not
actually a clock, but does have some clocking implications. When the external reference is used,
the master oscillator within the modem is locked to the external reference, and the internal
accuracy and stability of the unit assumes that of the External Reference. Therefore, not only are
the transmit frequencies locked to the external reference, but the modem's internal SCT Oscillator
is locked to the external reference as well.
MN-OM20– Revision 5
Rear Panel Interfaces
5–8
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