Ethernet (J21); Dmd20 Lbst Chassis Connections (Standard); Ext Ref (J10); Tx (J11) - Radyne DMD20 Installation And Operation Manual

DMD20/DMD20 LBST Universal Satellite Modem
When operating the remote port as RS232 using a cable pinned 1 for 1
may cause communication failures due to miss routing of standard
RS232 com port signals.
When operating the remote port as RS232, the cable used should only
have pins 2, 3 and 5 connected.

5.3.12 ETHERNET (J21)

The ETHERNET Port (J21) can be used for the Monitor & Control (M&C) Functions of the unit.
The physical interface is a standard female RJ-45 Connector.

5.4 DMD20 LBST Chassis Connections (Standard)

5.4.1 EXT REF (J10)

The External Reference Port is a 50-Ohm Female BNC Connector and will accept the following
frequencies: 1.0, 1.544, 2.0, 2.048, 5.0, and 10.0 MHz).

5.4.2 TX (J11)

The Transmit Output Port is a 50-Ohm Type-N Connector.

5.4.3 RX (J14)

The Receive Input Port is a 50-Ohm Type-N Connector.
TM103 – Rev. 2.5
Rear Panel Interfaces
5-7