Operational Connections; Figure 4-9. Rear Panel Operational Connections - Comtech EF Data CDM-710 Installation And Operation Manual

CDM-710/L Broadcast Satellite Modem
Rear Panel Connectors
CAUTION
PROPER GROUNDING PROTECTION IS REQUIRED. You must connect the
equipment to the protective earth connection at all times. Use this
ground stud during installation, configuration, and operation.
The AC power interface provides the safety ground.
As shown in Figure 4-5 and Figure 4-8 (Item 3): This #10-32 stud, located
adjacent to the power interface module, is used for connecting a common
chassis ground among equipment.

4.2.4 Operational Connections

See Sect. 4.1 Overview – Cabling Connections Types for information
about each connector type and its connection instructions.

Figure 4-9. Rear Panel Operational Connections

As shown in Figure 4-5 and Figure 4-9 (Items 4 through 10):
Item 4 – 'J7 | Ext Ref' Utility Connector
Use this female BNC connector to supply a master reference to the entire
chassis. The clocks on the Framer Card and the Modulator and Demodulator
Synthesizers are locked to this input, when it is used. Note that some data
interfaces have an Ext-Clk input for synchronizing the data sources. Refer to the
applicable Data Interface appendices in this manual for details.
Item 5 – 'J1 | Tx (Transmit)' IF Connector
CAUTION
THERE MAY BE DC VOLTAGES OF UP TO 48 VOLTS MAXIMUM PRESENT
ON THIS CONNECTOR.
4–10
MN/CDM710.IOM
Revision 12