Comtech EF Data CDM-600 User Manual download pdf (Page 2)

Specifications

Frequency Range

CDM-600: 50 to 90 or 100 to 180 MHz,

CDM-600L: 950 to 2000 MHz,

100 Hz frequency resolution

Input/Output Impedance

CDM-600: 50 or 75 Ω (front panel

selectable)

CDM-600L: transmit 50 Ω, receive

50 or 75 Ω, female Type N connector

Data Interfaces

EIA-422/-530, V.35, Sync EIA-232,

G.703 balanced or unbalanced, Low

Voltage Differential Signal (LVDS), HSSI

(using CIC-20 HSSI/LVDS interface

converter)

Data Rate Range

(1 bps programmable, and fully independent TX and RX rates)

Rate

Range

1/2 BPSK

2.4 kbps to 5.0 Mbps

1/2 QPSK/OQPSK

4.8 kbps to 10.0 Mbps

3/4 QPSK/OQPSK

7.2 kbps to 15.0 Mbps

7/8 QPSK/OQPSK

8.4 kbps to 17.5 Mbps

2/3 8-PSK

4.8 kbps to 20.0 Mbps

Uncoded

4.8 kbps to 20.0 Mbps

Turbo Product Coding Rates

Rate

Range

High-Rate

21/44 BPSK

4.8 kbps to 3.2 Mbps

4.77 Mbps

5/16 BPSK

4.8 kbps to 2.048 Mbps

3.12 Mbps

1/2 QPSK/OQPSK

4.8 kbps to 9.54 Mbps

Turbo Card

3/4 QPSK/OQPSK

7.2 kbps to 5.0 Mbps

15 Mbps

3/4 8-PSK

10.8 kbps to 5.0 Mbps

20 Mbps

3/4 16-QAM

14.4 kbps to 5.0 Mbps

20 Mbps

7/8 QPSK/OQPSK

8.4 kbps to 17.5 Mbps

Turbo Card

7/8 8-PSK

12.6 kbps to 20.0 Mbps

Turbo Card

7/8 16-QAM 16.8 kbps to 20.0 Mbps Turbo Card

0.95 QPSK/OQPSK

9.1 kbps to 18.888 Mbps

Turbo Card

0.95 8-PSK

13.6 kbps to 20 Mbps

Turbo Card

Low Density Parity Check (LDPC) Rates

1/2 BPSK

4.8 kbps to 5.0 Mbps

1/2 QPSK/OQPSK

4.8 kbps to 10.0 Mbps

2/3 QPSK/OQPSK

6.4 kbps to 13.3 Mbps

2/3 8-PSK, 8-QAM

9.6 kbps to 19.0 Mbps

3/4 QPSK/OQPSK

7.2 kbps to 15.0 Mbps

3/4 8-PSK, 8-QAM

10.8 kbps to 20.0 Mbps

3/4 16-QAM

14.4 kbps to 20.0 Mbps

Scrambling

Mode dependent - ITU V.35 (Intelsat IESS-

308), or externally synchronized (Intelsat

IESS-309/-310/-314 or proprietary

FEC Options

Viterbi

Rate 1/2 BPSK, QPSK/OQPSK

Rate 3/4 and 7/8 QPSK/OQPSK and 16-QAM

w/RS

Pragmatic TCM

8-PSK 2/3

Low-Rate TPC 21/44, 5/16 BPSK, and

3/4 8PSK, 3/4 16-QAM

High-Rate TPC 21/44, 5/16 BPSK,

1/2, 3/4, 7/8, 0.95 QPSK/OQPSK,

3/4, 7/8, 0.95 8-PSK, and 3/4, 7/8 16-QAM

LDPC 1/2 BPSK, 2/3, 3/4 QPSK/OQPSK,

2/3, 3/4 8-PSK, 2/3, 3/4 8-QAM, and

3/4 16-QAM

Reed-Solomon

Intelsat compliant and proprietary modes

available

Uncoded

BPSK, QPSK/OQPSK

M&C Interface

EIA-232, EIA-485 (2- or 4-wire)

Form C Relays

TX, RX traffic alarms and unit faults

Backward alarms for IDR and IBS

Data Interfaces

Electrical Interface

G.703 (T1, E1, T2, E2), RS-422, V.35, LVDS or

Synchronous RS-232

(refer to manual for further information)

Frame Formats

Supported

D4 or ESF for T1, CCS for E1

(Also CAS E1 for open network)

Available nx64 kbps

Data Rates

1 to 6, 8, 10, 12, 15, 16, 20, 24 or 30 for open

network, 1 to 24 for D&I++ enhanced proprietary

Electrical Interface

G.703 (T1, E1, T2, E2), RS-422, V.35, LVDS or

Synchronous RS-232

(refer to manual for further information)

EDMAC Operation

Special features of the modems are their 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. 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. An RF transceiver (C-Band and Ku-

Band) or Block Up Converter at the distant end of a satellite link may be controlled and monitored from the front panel of the modem

using a low data rate FSK signal on the RX IF cable via 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.

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 that offers the same bandwidth efficiency of 8-PSK but with improved BER performance and tracking in noisy

environments. The patented (U.S. patent 7,254,188) 8-QAM modulation was developed by Comtech EF Data in order to take full

advantage of the increased coding gain provided by LDPC, while allowing for acquisition and tracking at much lower Eb/No

compared to 8-PSK.

Drop and Insert (D&I++)

Full drop and insert functionality is available as an option. The modems offer 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

1/576th 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 modems. 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. AUPC also operates in this mode.

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Satellite Modems 1

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Comtech EF Data CDM-600 User Manual Page 2

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