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This chapter describes theory of operation for the SLM-7650.
4.1
Overview
The SLM-7650 is a duplex modem in a 1 RU chassis. The modem consists of three basic
sub-sections. The modulator section, the demodulator section , and the baseband
interface and monitor and control section.
The modem operates on 110/220 VAC (auto-selecting) and provides 50 to 90 MHz and
100 to 180 MHz transmit and receive intermediate frequency interfaces. The primary
baseband interface to the modem is MIL-STD-188-114 type II and III. An optional
interface card is available as a baseband interface for special applications. (Refer to
Figure 4-1 for the system operation.)
4.2
Built in Test
Hardware provisions are included for built in test. This built in test means that the
modem is constantly monitored for fault or alarm conditions. The fault and alarm status
of the modem is reported in the FAULT/ALARM menu. Summary faults are reported on
the front panel LED display. The Fault connector on the back of the interface will also
reports these summary faults through dry contact closures. The fault tree (Chapter 5,
Table 5-1) in the maintenance section is a guide for fault and alarm reporting.
Chapter 4. THEORY OF
4–1
OPERATION
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