SLM-3650 Satellite Modem
Revision 3
Options
MN/SLM3650.IOM
A–20
The ASYNC interface PCB also provides its own Doppler buffer, which has a maximum
depth of 32 ms at the highest terrestrial data rate. Buffer fill status can be checked in the
Monitor menu on the front panel of the modem. Depth selection and centering of the
buffer are provided in the Configuration Interface menu.
Figure A-5. ASYNC/AUPC Block Diagram
G.703
V.35
TERR DATA
TERR CLOCK
INPUT
FIFO
PLL
INTERFACE CNT SIGNALS
AUPC DATA FROM M&C
TERR DATA
TERR OVERHEAD CLOCK
INTERFACE CNT SIGNALS
ASYNC DATA
ASYNC DATA
UART
M&C CONTROL
G.703
V.35
TERR DATA
TERR CLOCK
BUFFER
AUPC DATA TO M&C
RX DATA
RX CLK
INTERFACE
SIGNALS
PLL
UART
ASYNC DATA
INTERFACE SIGNAL
DMUX
TERR DATA
RX CLK
ENABLE
4 OUTPUT
CLK SOURCES
MUX
M
O
D
U
L
A
T
O
R
D
E
M
O
D
U
L
A
T
O
R
T
E
R
R
E
S
T
R
I
A
L
EIA-422
EIA-485
EIA-232
EIA-485
EIA-422
EIA-232
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