Specifications

PSM-500/500L/500LT SCPC Satellite Modem Description
PSM-500/500L/500LT - Rev. 0.91
Page 1-7
Doppler
FIFO Buffer
Program
mable
Transmit Interface
DB37
Female
at J3
RS-449
or
V.35
or
RS-232
etc.
FEC
Encoder
Baseband Signal
Processing
Modulator
TClk TData RTS CTS
V.35/Intelsat
and
Differential
Encoder
Programmabl
e Attenuator
Transmit SynthesizerProcessor Control
Option
Interface
Connector
P1
TT Clk
Program
mable
Receive
Interface
DB37
Female
at J3
RS-449
or
V.35
or
RS-232
etc.
RClk RData Ready
Option
Interface
Connector
P1
Ext FIFO Clk
XMT Out
70 MHz
or L-Band
Figure - M500 Modem Block Diagram
FEC
Decoder
Baseband Signal
Processing
Demodulator
V.35/Intelsat
and
Differential
Decoder
Front end
AGC/Amp
A/D
Conversion
Receive Synthesizer
RCV In
70 MHz
(or L-Band)
Out Clk
In Clk
Modem
Reference
Oscillator
MODULATOR
DEMODULATOR
Interface & Loop-
Back Circuits
DSP Aquisition
Processor
25 dB
Loopback
Attenuator
Term
Term
Low
Pass Filter
Term
Ext. Reference In
Clock
Control
Aux.
Con-
nection
at J4
Figure 1-2 Modem Block Diagram