Terrestrial Interface Types; Eia-232 Specification - Comtech EF Data SDM-300L3 Installation And Operation Manual

SDM-300L3 Satellite Modem
Specifications
14.12

Terrestrial Interface Types

The following interface types are available with electrical properties indicated in the
following subsections:
Modem Configuration
25-pin Connector
34-pin Connector
37-pin Connector
50-pin Connector (W/Overhead
Board)
50-pin Connector
(Optional)
G.703: BNC-F and DB15 (DB15 for ASYNC)
14.12.1

EIA-232 Specification

Circuit Supported
Driver Amplitude (RXD, RXC,
ST, CTS, DM, DSR)
Receiver Amplitude (TXD,
TXC, RTS, LL, MC)
Impedance
Data Rate
EIA-232
X X
X
X X
X X
TXD, TXC, ST, RXD, RXC, DSR, DCD, CTS, LL, RTS, MC
0 / Space / ON (True): 10V, ± 5V
1 / Mark / OFF (False): -10V, ± 5V
0 / Space / ON (True): Minimum +1V
1 / Mark / OFF (False): Maximum -1V
5000, ± 2000Ω < 2500 pF
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)
14–31
EIA-422/ V.35 Overhead
EIA-449
X
X
X X
X
Revision 0
MN/SDM300L3.IOM
G.703
X