Terrestrial Interface; Figure 3-12. Asynchronous Overhead Interface Block Diagram - Comtech EF Data SDM-650B Installation And Operation Manual

Configuration
TRANSMIT SECTION
RS-232
ES TO ES ASYNC
INTERFACE
T1/E1 INTERFACE
G.703
T2/E2
CLK
RS-422 INTERFACE
MIL-STD-188-114
DATA
CLK
V.35 INTERFACE
DATA
EXTERNAL REFERENCE CLOCK
(TRANSMIT TERR CLOCK)
INTERNAL CLOCK

Figure 3-12. Asynchronous Overhead Interface Block Diagram

3.2.5.2 Terrestrial Interface

The terrestrial interface, AS/1311, forms the top (when mated with the connector board)
of the 2-board module. The interface contains all balanced pair drivers and receivers for
RS-422, MIL-STD-188, and V.35.
Data inputs are SD and transmit clock (TT or SCTE).
Data outputs are:
•
•
•
3–32
FRAMING/
P/O
TIMING
INT
LOGIC (MUX)
LPBK
TX DEJITTER
P/O
BASE
BAND
LPBK
CLOCK
SYNTHESIS
Modem reference clock (SCT or ST)
Receive data (RD)
Receive clock (RT or SCR)
RECEIVE SECTION
P/O
INT
MODEM
LPBK
DEFRAME/TIMING
LOGIC (DEMUX)
PLESIOCHRONOUS
BUFFER
SATELLITE CLOCK
INTERNAL CLOCK
TRANSMIT TERR CLOCK
EXTERNAL REFERENCE CLOCK
SDM-650B Satellite Modem
RS-232
INTERFACE
ES TO ES
ASYNC
T1/E1
T2/E2
G.703
P/O
INTERFACE
BASE
BAND
LPBK
RS-422
CLK
INTERFACE
MIL-STD
DATA
188-114
CLK
V.35
INTERFACE
DATA
CLOCK SYNTHESIS
Rev. 5