Specifications

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
15–31
15.12 Terrestrial Interface Types
The following interface types are available with electrical properties indicated in the
following subsections:
Modem Configuration EIA-232 EIA-422/
EIA-449
V.35 Overhead G.703
25-pin Connector X X X
34-pin Connector X
37-pin Connector X
50-pin Connector X X X X X
50-pin Connector
(Optional)
X X X
G.703: BNC-F and DB-9.DB9 for ASYNC
15.12.1 EIA-232 Specification
Circuit Supported TXD, TXC, ST, RXD, RXC, DSR, DCD, CTS, LL, RTS, MC
Driver Amplitude (RXD, RXC,
ST, CTS, DM, DSR)
0 / Space / ON (True): 10V, ± 5V
1 / Mark / OFF (False): -10V, ± 5V
Receiver Amplitude (TXD,
TXC, RTS, LL, MC)
0 / Space / ON (True): Minimum +1V
1 / Mark / OFF (False): Maximum -1V
Impedance
5000, ± 2000Ω < 2500 pF
Data Rate 9.6 to 120 kbps
TXD Send Data
RXD Receive Data
RTS Request to Send
CTS Clear to Send
DM Data Mode
DSR Receiver Ready
MC Master Clock
LL Local Loopback
ST Send Timing
RXC Receive Timing
TXC Terminal Timing
MF Mod Fault (TTL)
DF Demod Fault (TTL)