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Sms-451e, Tx if, Sdm-9000 – Comtech EF Data SMS-451 User Manual

Page 20: Rx if, Rx ter, Tx ter

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SMS-451 Sateliite Switch

Revision 0

Introduction

MN/SMS451.IOM

1–6

The system block diagram (Figure 1-5) shows how the switch provides the interface
between the prime modem and the terminal and IF converter equipment.

SMS-451E

TX IF

TX IF

SDM-9000

RX IF

RX IF

TX TER

ESC

ECL INTERFACE

RX TER

FAULT

RX TER

RX DATA
RX CLOCK
RX SYNC

ECL INTERFACE

TX IF

SDM-9000

RX IF

TX DATA

TX CLOCK
TX SYNC

TX TER

2 AUDIO
4 BW ALARM

ESC

TX TER

ESC

RX TER

FAULT

Figure 1-5. SMS-451E Block Diagram with SDM-9000 Satellite Modem


Connection of the SMS-451E with the SDM-2020 Modulator and/or Demodulator with a
HSSI Interface along with a Cisco router and test translator is shown in Figure 1-6. The
Y-cables between the modem and switch are provided. The cable between the switch and
the router is ordered separately.