Premier Mounts CDM-600 사용자 설명서

CDM-600 Satellite Modem 

Revision 7 

Physical Description  

MN/CDM600.IOM 

4–3 

The IF port connectors are both a 50

Ω BNC female type. 75Ω cable connectors (male) 

will have no problem mating with this 50

Ω type. The electrical impedance presented by 

these connectors is controlled internally by an RF-switching arrangement. This selection 
between 50

Ω and 75Ω is controlled either via the front panel menus, or via the remote 

control bus. 

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 
EIA-422 and 1/16 IBS overhead ESC at EIA-232. The IDR backward alarm inputs are 
found on this connector.  
 

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, V.35, and EIA232. 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 EIA-530 connector. 

 

This is a BNC female connector. It is used for operating the buffer with an external 
station reference. It requires an EIA-422 compatible level, so this unbalanced input 
should have a zero volt offset and a swing of at least 

± 2V into the 120 Ω termination 

provided. 

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 (600 

Ω transformer coupled, balanced signals). These 

can be used for both ESC voice circuits in IDR mode, or as the primary data (FAST 
option).