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CDM-600L Satellite Modem
Physical Description
IEC line input connector
The IEC line input connector contains the ON/OFF switch for the unit. It is also fitted
with two fuses - one each for line and neutral connections (or L1, L2, where appropriate).
These are contained within the body of the connector, behind a small plastic flap.
•
For continued operator safety, always replace the fuses with the correct type and rating.
IMPORTANT
RX and TX IF connectors (J1 and J2)
The TX-IF connector is a 50 Ω Type N female. The RX-IF connector is either a
50Ω Type N female or a 75Ω Type F female.
Data interface connector (P3B)
The Data connector is a 25-pin 'D' type female (DB25-F). This connector conforms to
the RS-530 pinout, which allows for connection of different electrical standards,
including RS-422, V.35, and RS-232. A shielded 25-pin 'D' type provides a very solid
solution to EMC problems, unlike the sometimes used V.35 Winchester connector.
It is the responsibility of the user to provide the appropriate cables to connect to
this RS-530 connector
IMPORTANT
Overhead data connector (P3A)
The Overhead data connector is a 25-pin 'D' type male (DB25-M). It is used for passing
components of INTELSAT specified overhead frame structures. These include 64 kbps
RS-422 and 1/16 IBS overhead ESC at RS-232. The IDR backward alarm inputs are
found on this connector.
Audio connector (P4A)
The Audio connector is a 9-pin 'D' type female (DB9-F). It is used for the two 32 kbps
ADPCM audio inputs and outputs (600Ω transformer coupled, balanced signals). These
can be used for both ESC voice circuits in IDR mode, or as the primary data (FAST
option).
Use T3.15A, (slow-blow) 20mm fuses.
.
4–3
Revision 0
MN/CDM600L.IOM
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