Remote Aupc; Theory Of Operation; Terrestrial Data Interfaces; Async Data Interfaces - Comtech EF Data SDM-300A Installation And Operation Manual

SDM-300A Satellite Modem
A.1.4.2

Remote AUPC

This feature allows the user to monitor and control a remote modem location using the
front panel or serial port of the local modem. The operator can set or reset the following
commands:
•
•
•
The user can remotely monitor the receive 2047 BER. Refer to Appendix B for a
description of remote operation.
A.1.4.3

Theory of Operation

A.1.4.3.1

Terrestrial Data Interfaces

Two I/O interfaces are provided for the terrestrial data source: EIA-422 and V.35. The
operator must select the terrestrial interface type from the front panel under the Utility
Interface menu. Once selected, I/O data is routed to and from the appropriate drivers and
receivers.
A.1.4.3.2

ASYNC Data Interfaces

The EIA-485 and EIA-232 I/O interfaces are provided for the ASYNC data source. The
operator must select the ASYNC data interface type from the front panel under the Utility
Interface menu. Once selected, the I/O data is routed to and from the appropriate drivers
and receivers.
EIA-485 (2-wire) requires connecting the TX + and RX + as one wire and tying TX and
RX for the second wire at the Data I/O/ This connection is not facilitated inside the
modem with relays.
Example:
Rev. 4
Baseband loopback
TX 2047 pattern
AUPC enable
T X
R X
E
50-PIN
S B O P M O D E M
C
Options
A–23