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Chapter 13. HSSI INTERFACE
(CDI-60)
13.1
Introduction
The CDI-60 HSSI Data Interface (Figure 13-1) is a plug-in module that is installed into the rear
of the CDM-710G High-Speed Satellite Modem chassis. It provides physical and electrical
connection between the external terrestrial device and the internal circuitry of the modulator or
demodulator.
Figure 13-1. CDI-60 HSSI Data Interface Module
By convention, a modem is Data Communications Equipment (DCE) where Tx data enters the
data interface and Rx data exits. The plug-in interface has full duplex capability. In addition, the
module is automatically configured for simplex-transmit or simplex-receive operation when the
module is plugged into a simplex chassis configured for 'modulator only' or 'demodulator only'
operation.
Slot 1 of the CDM-710G – located at the center right of the chassis rear panel – is filled with a data
interface module first; Slot 2 – located at the right side end of the chassis rear panel – is assigned a
blank panel or a CDI-70 10/100/1000 Base-T Gigabit Ethernet interface, depending upon
configurations allowed at time of order.
For a table of the applicable interfaces and installable combinations, refer to Sect. 1.3.5
Allowable Data Interface Combinations.
13–1
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