Comtech EF Data SLM-7650 Installation And Operation Manual page 101

SLM-7650 Satellite Modem
Theory of Operation
The option interface card when installed is integrated into the SLM7650 Monitor &
Control system with access to configuration and status monitoring. Details of the option
interface are included in the following sections.
4.4.3.2.1.1 Terrestrial Data Interface Selection
When the option interface card is installed terrestrial data interfacing is selectable as
defined in the following Table.
Selected Interface
EIA422 Modem
EIA422 Option Card
G.703 Balanced
G.703 Un-balanced
4.4.3.2.1.2 Terrestrial Data Interface, MIL-STD-188-114A/EIA-422 (50 pin)
The MIL-STD-188-114A/EIA-422 (RS422) option card interface is provided on a 50 pin
connector. See 50 pin connector pin-out for circuit definitions.
4.4.3.2.1.3 G.703 Data Interface
The G.703 data interface is compatible with the requirements set forth within CCITT
Recommendation G.703. Specific definitions for the G.703 interface implementation are
summarized in the following table.
Characteristic
Data Rates
Line Coding
Balanced Data Interface
Un-balanced Data Interface
Interface Connector(s)
25/37 pin
50 pin
15 pin / 50 pin
BNC
Definitions
1544.0 kbps (T1), 2048.0 kbps (E1), 6312.0 kbps (T2),
and 8448.0 kbps (E2)
AMI, HDB3, B6ZS, and B8ZS
Supported on the 50 pin and 15 pin connector
interfaces. Simultaneous connections to both
connectors is not supported.
Supported on BNC 75 ohm connector interface.
4–19
MN/SLM7650.IOM
Comments
Standard modem interface
Provided by option card
Provided by option card
Provided by option card
Revision 4