Chapter 1. Introduction; Overview; Standard And Optional Features; Figure 1-1. Cdm-Qx/Qxl Multi-Channel Satellite Modem (Cdm-Qxl Shown) - Comtech EF Data CDM-Qx Installation And Operation Manual

1.1

Overview

The CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier
modular multi-channel modem with redundancy contained in a single rack unit (1RU) chassis.
The CDM-Qx/QxL offers flexibility, redundancy, integration, and performance with four slots
configurable as modulators or demodulators. The CDM-Qx operates on the 70/140 MHz IF
frequency, while the CDM-QxL (Figure 1-1) is the L-Band (950MHz – 1950MHz) version of the
same modem.
The CDM-Qx/QxL supports DoubleTalk™ Carrier-in-Carrier
and receive (Rx) carriers in a full-duplex link to use the same transponder segment.

Figure 1-1. CDM-Qx/QxL Multi-Channel Satellite Modem (CDM-QxL shown)

1.1.1

Standard and Optional Features

The CDM-Qx/QxL includes, but is not limited to, the following features:
•
DoubleTalk™ Carrier-in-Carrier
the same transponder segment;
•
CDM-Qx: 50 to 90 and 100 to 180 MHz frequency range;
•
CDM-QxL: 950 MHz-1950 MHz L-band;
•
32 kbps to 20 Mbps;
•
BPSK, QPSK, 8-PSK, 16-QAM operation;
•
Flexible Configuration:
o 1 modem or 2 modems configured as 1:1
o Up to 4 demodulators
•
Optional Built In Redundancy:
o 1:1 modem

Chapter 1. INTRODUCTION

®
®
allowing Tx and Rx carriers of a full-duplex link to use
1–1
option, allowing transmit (Tx)
®
is a