Specifications

SDM-650B Satellite Modem Data Rates and Filters

Rev. 6 A–7

A.2.2 Hardware Configuration

This section lists the differences between a standard modem and a modem with the

variable rate filter installed.

A variable rate modem is end-to-end compatible with a non-variable rate modem of the

same model number. In most cases, the modem can be used as a prime or backup modem

in the same protection switch with a non-variable rate modem. In order for the existing

switch to operate with a variable rate modem, a software upgrade to the switch and

non-variable rate modems may be required. Contact the EFData Customer Support

Department for any questions regarding this matter.

Hardware Requirements

Assembly # Description

AS/1099-X Rev. - Modem Chassis

X = 1 — SDM-650B Chassis

AS/0356 Rev. F

or higher

Monitor and Control

M&C Software Requirements

SDM-650B Ver. 2.66 or higher

AS/0773-X - Modulator

X = 1 — SDM-650B

X = 3 — SDM-650F

AS/0929-X - Modulator Daughter

X = 1 — Variable Rate Closed Network EFData Filtering

X = 3 — Variable Rate Closed Network Fairchild Compatible

AS/0778-X - Demodulator

X = 1 — SDM-70/140 MHz 75

Ω

X = 6 — SDM-70/140 MHz 50

Ω

AS/0930-X - Demodulator Daughter

X = 1 — Variable Rate Closed Network

AS/0365-X - Sequential Decoder Option

X = 1 — Sequential Decoder with Rail