Comtech EF Data SDM-9000 - Manual (Page 24)

Introduction SDM-9000 Satellite Modem
1–2 Rev. 4
1.1 Overview
The modem is a high performance, full-duplex, digital-vector modulator/demodulator
that meets the open network requirements of the IESS-308 specifications for
Intermediate Data Rate (IDR). The modem can also be used for any closed network and
satellite communication system applications. Refer to Section 1.1.3 for additional
applications data.
Module types that are compatible with each application are as follows:
Configuration Interface Type FEC Option Options
70/140 MHz Duplex (AC) MIL188/144 with Buffer QPSK 50
Ω
70/140 MHz TX (AC) MIL188/144 with ESC 8PSSK/16QAM H/S 10-7
70/140 MHz RX (AC) MIL188/144 with Buffer /RS Digital Video Broadcast
(DVB)
70/140 MHz Duplex (DC) MIL188/144 with ESC/RS H/S 10-7 with DVB
70/140 MHz TX (DC) ECL with Buffer
70/140 MHz RX (DC) ECL with ESC
ECL with Buffer/RS
PECL with Buffer
PECL with ESC
PECL with Buffer/RS
PECL with ESC/RS
G.703 with Buffer
G.703 with ESC
G.703 Buffer/RS
G.703 with ESC/RS
G.703 with ESC/64 kbit/s
G.703 with ESC/64 kbit/s /RS
Notes:
1. 75
Ω
, QPSK, and +5 dBm output are standard with the SDM-9000.
2. The standard Reed-Solomon is in accordance with IESS-308 (IDR).
The modem operates with IF converter equipment operating within a 50 to 180 MHz
band. An internal channel unit, conforming to the IESS-308 specification, provides
overhead designated for Engineering Service Circuits (ESC).
The modem contains:
•
Built-in scramblers/descramblers
•
Differential encoder/decoder
•
Transmit and receive frequency synthesizers
•
Multi–rate Forward Error Correction (FEC) convolutional encoder and Viterbi
decoder