EMS Technologies Canada Ltd. HSD-400 Manuale Utente

The system RF parameters, such as cable losses and antenna gain, are defined to 
ensure that the HSD-400 terminal performance requirements are met. Refer to the 
Installation section of this manual for a definition of these parameters and their 
expected values.

The outputs to the optional “Remote Status Panel” provide a visual indication of the 
operational status of the HSD-400 terminal; they mirror the front panel LEDs labeled 
as Power (LED1) and Fault (LED2) as defined in Table 1-8. Refer to the Installation 
section of this manual for detailed installation and circuit requirements.

LED1

Power

Green

Power On: HSD-400 terminal supply voltage 
is active. Flashes at 1 Hz when the HPA is 
transmitting

LED2

Fault

Red 

Fault: Fault condition as described in "Fault 
Conditions" on page 1-10. 

A failure in the HSD-400 terminal may be due to a number of fault conditions. Upon 
detection of a fault condition, the HSD-400 terminal activates its red, Fault LED. The 
potential fault conditions are:

•

Channel Card Fault

•

HPA  Fault

•

External Reference Fault

•

Internal ROM Fault

•

Internal RAM Fault

•

Over Temperature Fault

•

Invalid LES Fault

The remote reset output provides an external reset function for the complete HSD-400 
terminal system. Pressing the momentary “normally open” (N.O.) switch resets the 
system's processor-card circuitry.

The remote reset has the same functionality as pressing the “test” button on the front 
panel of the terminal.

The HSD-400 terminal can support multiple voice and data communication configurations.