Comtech EF Data SNM-1000 - Manual (Page 36)

SNM-1000 Node Control Modem Revision 3
Installation MN/SNM1000.IOM
2–4
2.3 Rear Panel Connections
The rear panel connectors provide all necessary external connections between the node
control modem and other equipment. Figure 2-1 provides a layout of the SNM-1000 rear
panel, and Table 2-1 lists these connectors.
RX/IF INPUT
CP1 CP2
TX/IF OUTPUT J6
USER
PORT
J9
EF BUS 1/2
FAULT ALARMS
J7 J10
EX REF
CP3
AUX 1
Figure 2-2. SNM-1000 Rear Panel
Table 2-1. Rear Panel Connectors
Connection Description
GROUND CONNECTOR The GROUND CONNECTOR (GRN), provides a common chassis ground
connection among all of the equipment, via a #10-32 stud.
AC POWER The AC POWER accepts input power for the SNM-1000. (+
48 VDC optional)
USER PORT The USER PORT allows the user to configure setup parameters, and to
initiate/terminate remotely initiated calls.
EFBUS1/2 The EFBUS1/2 in used by the Node Control Modem to control up to 30 Comtech
EF Data/MIDAS modems.
AUXILIARY 1 The AUXILIARY 1 connector (J9), provides MOD and DEMOD (TTL) faults,
satellite clock, satellite I&Q, and Automatic Gain Control (AGC) output voltage.
FAULT The FAULT connector (J7), provides Form C contact closures for fault reporting.
ALARM
OUTPUT Not currently used.
The ALARM OUTPUT (J10), provides FORM C contact closures for the purpose
of fault reporting.
EXTERNAL
REFERENCE The EXTERNAL REFERENCE (CP3), is a BNC connector for an external
reference. The input impedance is 75
Ω
RX IF INPUT
CONNECTOR The RX IF INPUT CONNECTOR (CP2), is a BNC jack that provides a
connection for the receive IF signal.
TX IF OUTPUT
CONNECTOR The TX IF OUTPUT CONNECTOR (CP1), is a BNC jack that provides a
connection for the transmit IF signal.
Note: The European EMC Directive (EN55022, EN50082-1) requires using properly shielded
cables for DATA I/O. These cables must be double-shielded from end-to-end, ensuring a
continuous ground shield.