Comtech EF Data ICS-75 - Manual (Page 21)

ICS-75 Integrated Combiner Shelf Revision 5
Cable Connections MN/ICS75.IOM
3–3
3.3 Connection Description and Function
All connectors used on the ICS-75 are BNC type connectors. Depending on the unit’s
operational impedance, connector input and output impedance is either 50
Ω or 75Ω. See
Par. 3.4 for connector pinout information.
3.3.1 Uplink Connectors (Rear Panel)
3.3.1.1 Uplink Inputs
These are the four channels of the four to eight IF inputs from the modems that are
combined to form the transmitted signal paths.
3.3.1.2 Uplink Outputs
These are the four channels of combined IF inputs that are output to the transmitter.
3.3.2 Downlink Connectors (Rear Panel)
3.3.2.1 Downlink Inputs
These are the four channels that divide the signals from the receiver.
3.3.2.2 Downlink Outputs
These are the four channels of four to eight IF outputs that are divided to form the
received signal paths to the modems.
3.3.3 Monitor Connectors (Front Panel)
3.3.3.1 Uplink Monitor
These four outputs provide a means to check the summed IF signals. Each sample is
taken by a 20 dB directional coupler.
IMPORTANT
All unused connectors must be terminated with a load matching the
operational impedance of the unit (i.e., a 50Ω unit must use 50Ω
loads, and a 75Ω unit must use 75Ω loads).