Comtech EF Data CDM-500 Uživatelský manuál stáhnout pdf (Strana 1)

Modems

CDM-625 Advanced Satellite Modem

with DoubleTalk

Carrier-in-Carrier

INTRODUCTION

CDM-625 Advanced Satellite Modem builds on Comtech EF

Data’s legacy of providing the most efficient satellite modems.

It is the first modem to combine advanced 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

The advanced technologies and features of CDM-625 are

covered by a number of US Patents including 7,254,188,

7,353,444, 7,415,659 and other pending patents.

KEY FEATURES

• DoubleTalk Carrier-in-Carrier bandwidth compression

• Adaptive Coding and Modulation (ACM)

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

• Data Rate: 18 kbps to 25 Mbps

• Symbol Rate:18 ksps to 12.5 Msps

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

• Forward Error Correction (FEC): Viterbi, Sequential,

Concatenated Reed Solomon, TCM, Turbo Product Code

(TPC) (IESS-315 Compliant), Low Density Parity Check

(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 10/100 BaseT Ethernet

• 4-port Managed Ethernet Switch with VLAN and QoS

• 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: 10/100 BaseT Ethernet with SNMP, Distant

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

• 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 Rx: 10 MHz reference and LNB power supply

• Open Network Modes

• CDM-600/L emulation mode

• 1:1 and 1:10 Redundancy Switches Available

• Backwards compatible with CDM-500/CDM-550, CDM-550T,

CDM-570/L and CDM-600/L

• Interoperable with many Comtech EF Data satellite modems:

CDM-Qx/L, SDM-8000, 300A, and 300L3

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.

Figure 1 shows the typical full duplex satellite link, where the

two carriers are adjacent to each other. Figure 2 shows the

typical DoubleTalk Carrier-in-Carrier operation, where the two

carriers are overlapping, thus sharing the same spectrum.

When observed on a spectrum analyzer, only the Composite is

visible. Carrier 1 and Carrier 2 are shown in Figure 2 for

reference only.

Carrier-in-Carrier

is a Registered Trademark of Comtech EF Data

DoubleTalk

is a Registered Trademark of Applied Signal Technology, Inc.

VersaFEC

™

is a Trademark of Comtech AHA Corp.

Composi te

Carrier 2

Carrier 1

Carrier 1 Carrier 2

Figure 1. Traditional Full Duplex Link

Figure 2. Duplex Link with DoubleTalk Carrier-in-Carrier

1 2 3 4

Shrnutí obsahu

Strany 1 - Carrier-in-Carrier

Modems CDM-625 Advanced Satellite Modem with DoubleTalk® Carrier-in-Carrier® INTRODUCTION CDM-625 Advanced Satellite Modem builds on Comtech EF D

Strany 2

CDM-625 Advanced Satellite Modem with DoubleTalk Carrier-in-Carrier Modems Advanced Communication Solutions DoubleTalk Carrier-in-Carrier is compleme

Strany 3 - MODULATOR

www.comtechefdata.comSYSTEM SPECIFICATIONS Data Rate 18 kbps to 25 Mbps, in 1 bps steps (Modulation, FEC & Data Interface dependant) Symbol Ra

Strany 4

2114 West 7th Street, Tempe, Arizona 85281 USA Voice 1 480 333 2200 Fax 1 480 333 2540 Email [email protected] Comtech EF Data reserves the

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