Mocomtech CIM-550 - Manual (Page 41)

CiM-550 IP Enabled Satellite Modem Rev. 2
Installation CD/CIM550.IOM
15
FOR CONTINUED OPERATOR SAFETY, ALWAYS REPLACE THE FUSES
WITH THE CORRECT TYPE AND RATING.
IF Ports - The IF port connectors are both a 50 ohm BNC female type. 75 ohm cable
connectors (male) will have no problem mating with this 50 ohm type.
Data - The primary Data connector for the CiM-550 is the RJ-45 connector providing the
10/100 BaseT Ethernet interface.
In CDM-550 emulation mode, the Data connector is a 25 pin ‘D’ type female (DB25-F).
This connector conforms to the EIA 530 pinout, which allows for connection of different
electrical standards, including EIA-422/530, V.35, and EIA-232. Please note that it is the
responsibility of the user to provide the appropriate cables to connect to this EIA 530
connector. A shielded 25 pin ‘D’ type provides a very solid solution to EMC problems,
unlike the sometimes used V.35 Winchester connector. The pinout for the EIA 530
connector is provided in the next section.
Note that the currently selected interface type is indicated by a small orange LED which
is located immediately above the connector. This provides an easy visual indication to
anyone mating a connector at the rear of the unit.
Alarms - The Alarms connector is a 15 pin 'D' type male (DB15-M). This provides the
user with access to the Form-C relay contacts which indicate the fault status of the unit.
These are typically connected to an external fault monitoring system, often found in
satellite earth stations. In addition, the receive I and Q demodulator samples are provided
on this connector. 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 is also
provided which can mute the transmit carrier. This requires that the pin be shorted to
ground, or a TTL ‘low’, or an EIA-232 ‘high’ signal be applied.
As an aid to antenna pointing, or for driving step-track equipment, an analog AGC signal
is provided on a pin of this connector. The demodulator incorporates three separate AGC
control loops, one of which is analog, and two of which are entirely digital. The first of
these loops keeps the signal level constant at the input to the flash A/D converter in the
final IF stage. This loop has a limited dynamic range (~ 35 dB) and operates on the total
power within the IF bandwidth (which varies with data rate). The characteristics of this
control voltage are shown at the rear of the specifications section.
The pinout details for this connector are provided in the appendices.
Remote Control - The Remote Control connector is a 9 pin 'D' type female (DB9-M).
Access is provided to remote control ports of the modem, both EIA-232 and RS485. The
pinout details for this connector are provided in the next section.
Console Port – The console port is available for local configuration and management of
the Ethernet interface. This port is an EIA-232 port and uses a standard RJ-11.