Comtech EF Data CDM-600 Manual do Utilizador descarregar pdf

2114 West 7th St. Tempe, AZ 85281 USA

Tel. (480) 333-2200 Fax (480) 333-2540

www.comtechefdata.com

Comtech EF Data reserves the right to change specifications of products described in this document at any time without notice and without obligation to notify any person of such changes.

Information in this document may differ from that published in other Comtech EF Data documents. Refer to the website or contact Customer Service for the latest released product information.

CDM-600

Open Network Satellite Modem

2.4 kbps to 20 Mbps

MODEMS

CDM-600

INTRODUCTION

The CDM-600 is an Open Network modem, fully compliant with

Intelsat IESS-308, 309, 310, 314, and 315. It is available in

three data rate ranges - Low-rate variable (2.4 kbps to

5.0 Mbps), Mid-Rate variable (2.4 kbps to 10 Mbps) and High-

Rate variable (2.4 kbps to 20.0 Mbps). The modem includes

T1, E1, T2, and E2 G.703 interfaces, in addition to EIA422,

V.35, EIA232, and serial LVDS. HSSI is provided by adding

the CIC-20 interface converter.

The architecture is firmware- and FPGA-based, and the

internal Flash memory allows easy updating via the serial port.

FEATURES

• Forward Error Correction choices include Turbo Product

Coding (IESS-315 compliant), Viterbi, Sequential, Reed-

Solomon, TCM, and LDPC

• Open Network compatible and backwards compatible with

the CDM-500/CDM-550 and CDM-550T

• Intelsat Intermediate Data Rate (IDR)

• Intelsat Business Services (IBS)

• D&I++

• ESC++

• Data rate range from 2.4 kbps to 20 Mbps

• Software-selectable 50/75Ω IF port impedance

• Automatic Uplink Power Control (AUPC)

• BPSK, QPSK, OQPSK, 8-PSK, 8-QAM, and 16-QAM

modulation types

• Asymmetric Loop Timing

• 1:1 and 1:10 redundancy switches available

FEATURE ENHANCEMENTS

Enhancing the CDM-600’s performance and adding features is

quickly accomplished on site, using FAST access codes

purchased from Comtech EF Data. To enable these features,

simply enter the code at the front panel.

TURBO PRODUCT CODING

The CDM-600 offers all traditional FEC methods and

incorporates an optional Turbo Product Codec (TPC). TPC

simultaneously offers increased coding gain, lower decoding

delay, and significant bandwidth savings.

Two TPC codecs are offered as hardware options:

• The Low Rate TPC codec operates up to 5 Mbps with

limited code rates.

• The High Rate TPC codec operates up to 20 Mbps, and

offers a full range of code rates (5/16 through 7/8 and 0.95)

with all modulation types from BPSK to 16-QAM.

LOW DENSITY PARITY CHECK (LDPC) CODING

AND 8-QAM MODULATION

A third codec is available as a hardware option. The

TPC/LDPC Codec combines all TPC functions of the High Rate

TPC option, plus the following new features:

• Improved performance of LDPC codes at 1/2, 2/3, and 3/4

rates to further improve coding gain and bandwidth

efficiency.

• 8-QAM modulation which offers the same bandwidth

efficiency of 8-PSK but with improved BER performance and

tracking in noisy environments.

DROP AND INSERT

Full Drop and Insert functionality is available as an option. The

CDM-600 offers two variants of Drop and Insert (D&I). The first

is an Intelsat Open Network-compliant mode, using the IBS

framing (6.7%). The second is CEFD’s Proprietary Enhanced

mode, called D&I++. This “n” x 64 kbps mode offers any value

of “n” up to 24, and permits the simultaneous use of EDMAC,

AUPC (see below) and an ESC circuit at 1/576

of the user

data rate. This is achieved with the addition of only 2.2%

overhead.

ESC++

A high rate overhead channel is now standard in the new

enhanced version of the CDM-600. This provides a separate

RS-232 channel allowing up to 4.8 kbaud at 64 kbps and up to

38.4 kbaud at 512 kbps. In this mode, AUPC also operates.

EDMAC OPERATION

A special feature of the CDM-600 is its ability to monitor

and control the distant end of a satellite link using a

Comtech EF Data proprietary overhead channel. This framed

mode is called EDMAC (Embedded Distant-end Monitor and

Control). User data is framed and extra bits are added to pass

control, status, and Automatic Uplink Power Control

information. This process is completely transparent to the

user. Comtech EF Data’s RF transceivers (C-band and Ku-

band) may be controlled from the front panel of the modem

using a low data rate FSK signal on the Rx IF cable. An RF

Transceiver at the distant end of a satellite link may also be

controlled and monitored through the EDMAC channel.

REMOTE CONTROL

The operator may configure and monitor the modem from the

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

configurations may be stored in the modem. An event log

stores alarm and status information in non-volatile RAM, while

the Link Statistics log stores link performance (E

and

AUPC performance) for QoS reporting purposes. SatMac, a

Windows-based monitor and control program, is available for

configuring the local and distant end modems, transceivers,

and redundancy switches.

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