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Modems

CDM-Qx Multi-Channel

Modem with DoubleTalk™

Carrier-in-Carrier™

INTRODUCTION

The CDM-Qx is the first 70/140 MHz modular multi-channel

satellite modem packaged in a single rack unit chassis.

The unit offers exceptional flexibility, redundancy,

integration, and performance with four configurable slots.

The unique architecture allows cost-effective deployment

of multiple modulators, demodulators or modems.

CDM-Qx also supports the DoubleTalk Carrier-in-Carrier

option, allowing it to transmit and receive in the same

transponder segment.

This flexible modem was designed with satellite

operators, service providers and enterprise users in

mind. It addresses common challenges encountered

when utilizing satellite communications, including:

• Requirement for increasing throughput of

point-to-point links without utilizing additional

transponder resources

• Need to expand networks with multiple modulators

and/or demodulators (asymmetrical links)

• Limited rack space

FEATURE ENHANCEMENTS

Enhancing the performance of the CDM-Qx is easy.

Additional features are added quickly on site, using

FAST access codes purchased from Comtech EF Data.

To enable these features, simply enter the code at the

front panel. Other features are added with a simple

module swap.

DOUBLETALK CARRIER-in-CARRIER

Designed for bandwidth compression, Carrier-in-Carrier

is based on Applied Signal Technology’s DoubleTalk™,

which uses “Adaptive Cancellation,” a patent pending

technology that allows full duplex satellite links to

transmit concurrently in the same segment of

transponder bandwidth.

Available as an option to the CDM-Qx, this added

dimension can result in a significant improvement in

satellite transponder utilization. When combined with

our advanced forward error correction and modulation

techniques, DoubleTalk Carrier-in-Carrier can deliver

unprecedented operating expense savings

FEATURES

• Optional DoubleTalk Carrier-in-Carrier allowing

Tx and Rx in the same transponder segment

• 50 to 90 and 100 to 180 MHz frequency range

• 128 kbps to 20 Mbps plus limited capability down to

32 kbps

• BPSK, QPSK, 8-PSK, 16-QAM operation

• Flexible configuration

• 1 or 2 modems

• Up to 4 modulators

• Up to 4 demodulators

• Any combination, four slots available

• Optional: Built In Redundancy

• 1:1 modem

• Up to 1:3 modulator

• Up to 1:3 demodulator

• RS-422, V.35, Sync RS-232, G.703 (E1/T1) Interfaces

• RS-232, RS-485 and TCP/IP for M&C remote control

• Viterbi 1/2, 3/4, and 7/8 (QPSK)

• Concatenated Reed Solomon, 2/3 8-PSK, 3/4 16QAM

• Optional: Turbo Product Coding, IESS-315 Compliant

• Asymmetric Loop Timing

• Common frequency reference for all modules

• Optional: High Stability Reference

• Optional: Redundant Power Supply

• Individual modulator output power control

• Interoperable with many Comtech EF Data satellite

modems: CDM-550T, 570, 570L, 600, 600L,

SDM-8000, 300A, and 300L3

TURBO PRODUCT CODING

The CDM-Qx offers optional 2

generation Turbo

Product Codec (TPC). TPC simultaneously delivers

increased coding gain, lower decoding delay, and

significant bandwidth savings. The TPC provides:

• BPSK 21/44 and 5/16

• QPSK / OQPSK 21/44, 3/4, 7/8 and 17/18

• 8-PSK 2/3, 3/4, 7/8, and 17/18

• 16-QAM 3/4 and 7/8

REMOTE CONTROL

The operator may configure and monitor the modem

from the front panel, or through the remote M&C port.

M&C is via RS-232, RS-485 (2/4 wire) or TCP/IP.

1 2 3 4

Indice de contenidos

Pagina 1 - Carrier-in-Carrier™

ModemsCDM-Qx Multi-Channel Modem with DoubleTalk™ Carrier-in-Carrier™ INTRODUCTION The CDM-Qx is the first 70/140 MHz modular multi-channel satellite

Pagina 2 - MODEM INTERFACES

Optimizing Satellite CommunicationsCDM-Qx Multi-Channel Modem with DoubleTalk™ Carrier-in-Carrier™ DOUBLETALK CARRIER-IN-CARRIER EXAMPLE Normal carri

Pagina 3

www.comtechefdata.com SYSTEM SPECIFICATIONS Input/Output Impedance 75Ω (Optional 50Ω) IF Connectors BNC female Data Rate (See Manual) 128 kbps to

Pagina 4

CDM-Qx Multi-Channel Modem with DoubleTalk™ Carrier-in-Carrier™ 2114 West 7th Street, Tempe, Arizona 85281 USA Voice 1 480 333 2200 Fax 1 480 333

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