Comtech EF Data SDM-300A - Manual (Page 90)

SDM-300A Satellite Modem Revision 6
External Connections MN/SDM300A.IOM
4–12
4.1.4 G.703/ASYNC Interface
The G.703 T1, E1/ASYNC Interface Adapter has three BNC connectors and a 15-pin
subminiature D connector.
• BNC connectors SD (J2) and RD (J3) support the G.703 unbalanced 75Ω TX and RX
data interfaces.
• BNC connector MC (J4) supports the 75Ω unbalanced Master Clock interface.
The 15-pin D connector (J5) supports the G.703 balanced TX and RX data, balanced Master
Clock, Open Collector MOD and DEMOD fault, and asynchronous overhead data interfaces.
Table 4-8 shows the pinouts for the 15-pin D connector.
This interface does not support access to IBS or IDR overhead signals and does not support
D&I.
Table 4-8. G.703/ASYNC Pin Assignments
Pin # Signal
1
9 SD-
SD+
2
4 GND
3
11
RD-
RD+
5
12
ETXB
ETXA
6
13
ERXB
ERXA
7
8 MC-
MC+
10 N.C.
14 MODFLT
15 DMDFLT