J4 | Mgmt Connector, Rj-45F; J8 | Ext Ref Connector, Bnc - Comtech EF Data CDM-750 Installation And Operation Manual

CDM-750 Advanced High-Speed Trunking Modem
Rear Panel Connections
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
1 TRP1+
2
3 TRP2+
4 TRP3+
5
6
7 TRP4+
8
3.2.2.5

J8 | EXT REF Connector, BNC

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
J8 EXT REF OUT
Direction (I/O)
I/O
TRP1- I/O
I/O
I/O
TRP3- I/O
TRP2- I/O
I/O
TRP4- I/O
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.
Connector Type
BNC
Description
External Reference
3–10
Revision 2
MN-CDM750
Direction (I/O)
I/O