Comtech EF Data SDM-650B - Manual (Page 173)

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