Comtech EF Data CDM-750 - Manual (Page 56)

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Rear Panel Connections MN-CDM750
3–10
3.2.2.4 J4 | MGMT Connector, RJ-45F
The RJ‐45 female J4 | MGMT connector is an auto‐sensing, auto‐crossover port. It is
reserved for use as 10/100 Ethernet‐based remote management and control (M&C).
The connector pinouts are as follows:
Pin # Description Direction (I/O)
1 TRP1+ I/O
2 TRP1- I/O
3 TRP2+ I/O
4 TRP3+ I/O
5 TRP3- I/O
6 TRP2- I/O
7 TRP4+ I/O
8 TRP4- I/O
3.2.2.5 J8 | EXT REF Connector, BNC
The female BNC J8 | EXT REF (External Reference) input/output connector is
used to supply a master reference to the entire chassis. The internal 10 MHz
reference is phase locked to this input, if selected. The frequency references on
the internal PWB’s are locked to this input, when it is used.
This connector features an LED labeled “EXT REF OUT” that lights amber to indicate the
presence of an outgoing signal. The LED is dark when the external reference signal is incoming.
When External Reference is not used, the unit will output the internal 10 MHz reference
(stability ±06 ppm).
Ref Des Name Connector Type Description Direction (I/O)
J8 EXT REF OUT BNC External Reference I/O