Q-Lite Satellite Modem Installation and Operating Handbook
5-11
The
Q-Lite™
circuit board connectors are as follows:
•
+24V DC Connector
The modem is designed to operate from a regulated +24V DC input. There is no
further regulation of the 24V provided on the circuit board itself and therefore the
input must be at exactly 24V. A four-way screw-terminal is provided with duplicate
24V and ground pins, allowing for a second independent power source to be used
to increase reliability.
•
Alarm Connector (J51)
This is a two-pin Molex single-output summary alarm that combines all of the alarm
states in the modem including traffic and unit alarms. It is an open-collector output
where open circuit indicates that there is an alarm and the closed state (when the
output is pulled to ground) indicates the absence of any fault.
•
Tx L-band Output
This is a 50
Ω
TNC-type femail connector. The output power level can be varied
from 0dBm to –30dBm.
•
Terrestrial Interface Position
There is one terrestrial interface position that can be fitted with a variety of interface
cards including EIA-530, G.703, Quad E1, Quad ASI, LVDS, HSSI and STM-1/OC-
3/Optical Ethernet.
•
Rx L-band Input
This is a 50
Ω
TNC-type female connector. The carrier signal level at the input of the
modem must be in the following range:
Minimum signal level: -130 +10 log (symbol rate) dBm
Maximum signal level: -80 + 10 log (symbol rate) dBm
The maximum wanted-to-composite power level that is supported with no
implementation loss is defined by the equation:
Maximum wanted-to-composite power level: -102 + 10 log (symbol rate) dBm
The maximum composite power level is +10dBm.