Utility Connections Group; 10/100 Ethernet | M&C 100 Port, Rj-45 (Standard); Remote Control Connector, Db-9M; Alarms (Form-C Traffic Alarms) Connector, Db-15M - Comtech EF Data CDM-570A Installation And Operation Manual

3.2.3 Utility Connections Group

3.2.3.1 10/100 Ethernet | M&C 100 Port, RJ-45 (Standard)
See Table 3-3 for the typical port pinouts.
3.2.3.2

Remote Control Connector, DB-9M

Use this 9-pin type 'D' male (DB-9M) connector to connect the modem to an M&C
computer, or terminal device. This interface is user-selectable for either EIA-232 or
EIA-485.
3.2.3.3

Alarms (Form-C Traffic Alarms) Connector, DB-15M

This connector also provides:
•
The receive 'I' and 'Q' demodulator samples. Connecting these signals to an oscilloscope
in X,Y mode will provide the receive signal constellation diagram, which is a useful
diagnostic aid.
•
A pin that can mute the transmit carrier; this requires that the pin be shorted to ground or
a TTL 'low', or that an EIA-232 'high' signal be applied.
•
An analog AGC signal (Pin 2) as an aid to antenna pointing or for driving step-track
equipment.
Rear Panel Connectors and Pinouts
CDM-570A/570AL Satellite Modem with Optional Packet Processor
This 8-pin RJ-45 modular port is present on the base modem assembly. Use a
CAT5 cable to connect this port to an Ethernet hub, router, switch, PC, etc. for
M&C purposes and to update the base modem firmware.

Table 3-5. Remote Control Connector Pin Assignments

Pin # Description
1 Ground
6 EIA-485 Receive Data B**
2 EIA-232 Transmit Data
7 EIA-485 Receive Data A**
3 EIA-232 Receive Data
8 EIA-485 Transmit Data B
4 Reserved - do not connect to this pin
9 EIA-485 Transmit Data A
5 Ground
**Use for EIA-485 2-Wire operation
Use this 15-pin type 'D' male (DB-15M) connector to provide user access to
the Form-C relay contacts that indicate the unit alarms/fault status. These
contacts typically connect to the external fault monitoring system often
found in satellite earth stations.
3–11
Revision 5
Direction
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In
Out
In
In
Out
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Out
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MN-CDM570A