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CDM-625 Advanced Satellite Modem

Satellite Modems

Overview

The CDM-625 Advanced Satellite Modem builds on our legacy of providing

the most efficient satellite modems. It was our first modem to combine

advanced Forward Error Correction (FEC) such as VersaFEC



and Low

Density Parity Check (LDPC) codes with the revolutionary DoubleTalk



Carrier-in-Carrier



bandwidth compression, allowing for maximum savings

under all conditions. This combination of advanced technologies enables

multi-dimensional optimization, allowing satellite communications users to:

• Minimize operating expenses (OPEX)

• Maximize throughput without using additional transponder resources

• Maximize availability (margin) without using additional transponder

resources

• Minimize capital expenses (CAPEX) by allowing a smaller BUC/HPA

and/or antenna

• Or, a combination to meet specific business needs

Typical Users

• Mobile Network Operators

• Telecom Operators

• Satellite Service Providers

• Government & Military

• Enterprise

• Offshore

Common Applications

• Mobile Backhaul

• G.703 Trunking

• IP Trunking

• Offshore & Maritime Communications

• Enterprise

• Communications on-the-Move

• Satellite News Gathering

Features

• DoubleTalk Carrier-in-Carrier bandwidth compression

• Carrier-in-Carrier Automatic Power Control

• Adaptive Coding and Modulation (ACM)

• Packet Processor with header compression, payload

compression, advanced Quality of Service (QoS) and

Managed Switch Mode

• 4-port managed Ethernet switch with VLAN and QoS

• Jumbo frame support

• Dual Band Capability: 70/140 MHz and L-Band in same unit,

extended L-Band receive

• Data Rate: 18 kbps to 25 Mbps

• Symbol Rate: 18 ksps to 12.5 Msps

• Modulation: BPSK, QPSK/OQPSK, 8PSK/8-QAM, 16-QAM

• FEC: Viterbi, Sequential, Concatenated Reed Solomon, TCM,

Turbo Product Code (TPC) (IESS-315 Compliant), LDPC Code

and VersaFEC (low-latency LDPC)

• Widest Range of data interfaces: EIA-422/530, V.35, G.703 T1,

G.703 E1, G.703 T2, G.703 E2, Quad G.703 E1, ASI, LVDS,

HSSI, 4-port 10/100Base-T Ethernet

• IEEE 1588v2 Precision Time Protocol

• Sub Mux to multiplex IP/Ethernet traffic with serial or G.703

traffic

• Drop & insert for T1/E1

• Enhanced D&I++ for single T1/E1 & quad E1

• Management: 10/100Base-T Ethernet with SNMP, Distant

End SNMP Proxy, HTTP, Telnet and EIA-232/EIA-485

• Carrier ID using MetaCarrier

Technology

• Embedded Distant-end Monitor and Control (EDMAC)

• Automatic Uplink Power Control (AUPC)

• Engineering Service Channel (ESC/ESC++)

• Standard high-stability internal reference

(± 6 x 10

-8

)

• 5-tap Adaptive Equalizer

• L-Band TX: 10 MHz reference for BUC, FSK communications

and optional BUC power supply

• L-Band: Advanced FSK for LPOD M&C

• L-Band RX: 10 MHz reference and LNB power supply

• Open network modes

• 1:1 and 1:10 redundancy switches available

Doubletalk Carrier-In-Carrier

DoubleTalk Carrier-in-Carrier, based on patented “Adaptive Cancellation” technology, allows transmit and receive carriers of a duplex

link to share the same transponder space. DoubleTalk Carrier-in-Carrier is complementary to all advances in modem technology,

including advanced FEC and modulation techniques. As these technologies approach theoretical limits of power and bandwidth

efficiencies, DoubleTalk Carrier-in-Carrier utilizing advanced signal processing techniques provides a new dimension in bandwidth

efficiency.

www.comtechefdata.com

1 2 3 4 5

Sommario

Pagina 1 - Features

CDM-625 Advanced Satellite Modem Satellite Modems Overview The CDM-625 Advanced Satellite Modem builds on our legacy of providing the most effi

Pagina 2 - Figure 2

Figure 1 shows the typical full-duplex satellite link, where the two carriers are adjacent to each other. Figure 2 shows the typical DoubleTalk Car

Pagina 3

Packet Processor The Packet Processor enables efficient IP networking and transport over satellite by adding routing capability with very low overhead

Pagina 4 - Specifications

Specifications Data Rate 18 kbps to 25 Mbps, in 1 bps steps (modulation, FEC & data interface dependant) Symbol Rate 18 ksps to 12.5 Msps Opera

Pagina 5 - Accessories

Demodulator Input Power Range, Desired Carrier 50-180 MHz: -105 + 10 log (symbol rate) to -70 + 10 log (symbol rate) dBm 950-2150 MHz: -130 + 10 log

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