Comtech EF Data SDM-650B - Manual (Page 261)

SDM-650B Satellite Modem Asynchronous Overhead Channel Unit
Rev. 5 F–3
RECEIVE SECTION TRANSMIT SECTION
INTERFACE
ES TO ES ASYNC
LOGIC (MUX)
RS-232 TIMING
FRAMING/
P/O
INT
LPBK
MODEM
P/O
INT
LPBK
RS-232
INTERFACE
ES TO ES
ASYNC
DEFRAME/TIMING
LOGIC (DEMUX)
TX DEJITTER
T1/E1 INTERFACE
G.703
T2/E2
P/O
BASE
BAND
PLESIOCHRONOUS
BUFFER
P/O
BASE
BAND
LPBK
T1/E1
T2/E2
INTERFACE
RS-422
G.703
CLK
CLK
DATA
V.35
INTERFACE
INTERFACE
MIL-STD
188-114
LPBK
RS-422 INTERFACE CLK
DATA
MIL-STD-188-114
V.35 INTERFACE
CLK
DATA
INTERNAL CLOCK
SATELLITE CLOCK
CLOCK SYNTHESIS
DATA
EXTERNAL REFERENCE CLOCK
TRANSMIT TERR CLOCK
CLOCK
SYNTHESIS
EXTERNAL REFERENCE CLOCK
INTERNAL CLOCK
(TRANSMIT TERR CLOCK)
Figure F-1. Asynchronous Overhead Interface Block Diagram