CDM-600 AND CDM-600L SATELLITE MODEMS
The CDM-600 and CDM-600L are open network satellite modems, which are fully compliant with IESS-308, -309, -310, -314, and -315 from 64 kbps through T2 and E2. They are available in the following three data rate ranges:
- Low-Rate variable: 2.4 kbps to 5.0 Mbps
- Mid-Rate variable: 2.4 kbps to 10.0 Mbps
- High-Rate variable: 2.4 kbps to 20.0 Mbps
In addition, both modems operate in closed network from 2.4 kbps to 10 Mbps. The modems include T1, E1, T2, and E2 G.703 interfaces, in addition to EIA-422, V.35, EIA-232, 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. The modem offers exceptional flexibility and performance in a 1RU enclosure.
CDM-600L REAR PANEL
FEATURES
FEATURE ENHANCEMENTSEnhancing the modem's performance 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. | TURBO PRODUCT CODINGThe modems offer all traditional FEC methods and incorporate an optional Turbo Product Codec (TPC). TPC is a FEC technique that delivers significant performance improvement when compared to Viterbi with concatenated Reed-Solomon. TPC simultaneously offers increased coding gain, lower decoding delay, and significant bandwidth savings. Two TPC codecs are offered as hardware options:
EDMAC OPERATIONA special feature 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 (Embedded Distantend 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. 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 (Eb/No 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.
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.
| Manufacturer | Comtech EF Data |
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| System Specifications | ||||||||||||||||
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| Frequency Range | 950 to 1750 MHz in 100 Hz steps | |||||||||||||||
| Input/Output Impedance | 50 Ohms Tx and 75 Ohms Rx | |||||||||||||||
| IF Connectors | Tx Type N, female, Rx Type F, female | |||||||||||||||
| Data Rate (See Manual) | 2.4 kbps to 20 Mbps in 1 bps steps within symbol rate range | |||||||||||||||
| Symbol Rate | 4.8 ksps to 10 Msps | |||||||||||||||
| Turbo Product Coding | 4.8 kbps to 5 Mbps (Low Rate Option) 4.8 kbps to 20 Mbps (High Rate Option) | |||||||||||||||
| Scrambling | Intelsat IESS-308, -309, -310 or proprietary | |||||||||||||||
| FEC Options (Viterbi) | BPSK, QPSK and OQPSK 1/2 QPSK, OQPSK and 16QAM w/RS 3/4 and 7/8 | |||||||||||||||
| FEC Options (Sequential) | BPSK 1/2, O/QPSK 3/4, and 7/8 | |||||||||||||||
| Pragmatic TCM | 8PSK 2/3 | |||||||||||||||
| Turbo Product Coding | BPSK 21/44, 5/16 QPSK/OQPSK 3/4 | |||||||||||||||
| (TPC) - Low Rate | 8PSK 3/4, 16QAM 3/4 | |||||||||||||||
| Turbo Product Coding | BPSK 21/44, 5/16 QPSK/OQPSK 1/2, 3/4, 7/8, 0.95 | |||||||||||||||
| (TPC) - High Rate | 8PSK 3/4, 7/8, 0.95 | |||||||||||||||
| (Enhanced) | 16QAM 3/4, 7/8, 0.95 | |||||||||||||||
| Reed-Solomon | Intelsat compliant, and proprietary modes available | |||||||||||||||
| Uncoded | BPSK, QPSK and 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 Interface Specifications | ||||||||||||||||
| 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) | |||||||||||||||
| Drop And Insert | G.703 (T1 or E1) | |||||||||||||||
| Frame formats supported | D4 or ESF for T1, CCS or CAS for E1 | |||||||||||||||
| N x 64 kbps Data Rates | N = 1 to 6, 8, 10, 12, 15, 16, 20, 24 or 30 | |||||||||||||||
| ESC Interfaces (IDR) | 96 kbps overhead | |||||||||||||||
| IDR (Voice Orderwire) | 2 ADPCM (input: 4-wire VF), or 64 kbps data | |||||||||||||||
| IDR (Data Orderwire) | 8 kbps (EIA-422 interface) | |||||||||||||||
| IDR (Backward Alarms) | Form C contacts, hardware or software mapped | |||||||||||||||
| IBS | 1/15 x data date overhead | |||||||||||||||
| IBS (ASYNC Data Orderwire) | 1/2000 x data rate | |||||||||||||||
| IBS (Backward Alarm) | Form, C contacts | |||||||||||||||
| Receive Buffer | 64 to 262144 bits, in 16 bit increments | |||||||||||||||
| Receive Clock Options | Rx Satellite, Tx Terrestrial, EXT REF, Insert | |||||||||||||||
| Clock Tracking | ±100 ppm minimum | |||||||||||||||
| External Reference Input | BNC connector, 2.4 kHz to 20 MHz | |||||||||||||||
| 10MHz Reference Specifications | ||||||||||||||||
| Stability | 0.02 ppm standard, 1.0 ppm optional (not with BUCs) | |||||||||||||||
| Power Level | BUC: 0 dBm ± 3dB via Tx center conductor LNB -3 dBm ± 3dB via Rx center conductor | |||||||||||||||
| Modulator Specifications | ||||||||||||||||
| Output Spectrum/filtering | Meets IESS-308/309 power spectral mask | |||||||||||||||
| Frequency Stability | ± 0.02 ppm (standard) or ±1 ppm (optional), 0 to 50°C | |||||||||||||||
| Output Power | 0 to -30 dBm, 0.1 dB steps | |||||||||||||||
| Accuracy | ±1.5 dB over frequency and temperature | |||||||||||||||
| BUC FSK Communications | Via Tx center conductor with FSK BUCs | |||||||||||||||
| ODU / BUC Voltage | 24 VDC, 4 amps, 100W | |||||||||||||||
| ODU / BUC Voltage (Optional) | 48 VDC, 3 amps 150W | |||||||||||||||
| Environmental and Physical Specifications | ||||||||||||||||
| Temperature | Operating: 0 to 50°C (32 to 122°F) Storage: -25 to 85°C (-13 to 185°F) | |||||||||||||||
| Power Supply | 100 to 240 volts AC, 50/60 Hz | |||||||||||||||
| Power Consumption | 35 W typical (40 W maximum) | |||||||||||||||
| Physical Dimensions (1RU) | 1.75H x 19.0W x 19 D inch, 4.4H x 48W x 48D mm, approx. | |||||||||||||||
| Weight | 15 lbs (7.0 kg), approx | |||||||||||||||
| Agency Approvals | CE: EN55022 Class B (Emissions), EN50082-1 Part 1 (Immunity), EN60950 (Safety). FCC: Part 15 Class B | |||||||||||||||
| Demodulator Specifications | ||||||||||||||||
| Input Power, Minimum | -130 dBm + 10 Log (Symbol Rate) | |||||||||||||||
| AGC | 50 dB above minimum | |||||||||||||||
| Max Composite Level | +30 dBc, up to -5 dBm | |||||||||||||||
| Acquisition Range | ±500 KHz, programmable in 1 kHz steps | |||||||||||||||
| Acquisition Time | Example: 200 ms average at 64 kbps Rate1/2 QPSK, and ± 32 kHz acquisition range | |||||||||||||||
| LNB Voltage | +13, +18 VDC and 24 VDC at 500 mA max | |||||||||||||||
| EXAMPLE BER PERFORMANCE | MET WITH TWO ADJACENT CARRIERS 7 dB HIGHER GUARANTEED Eb/No, in dB (Typical values in parentheses) | |||||||||||||||
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| Sequential | (Consult CDM-600L Manual for comprehensive details) | |||||||||||||||
| Viterbi and concatenated Reed-Solomon 220/200 or 200/180 | ||||||||||||||||
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| 8-PSK TCM/RS (IESS-310) | (Consult CDM-600L Manual for comprehensive details) | |||||||||||||||
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| (Please consult the CDM-600 Manual for a comprehensive listing of the performance of all FEC types, Code Rates, and Modulation types) | ||||||||||||||||
Comtech CDM-600 & CDM-600L Open Network Satellite Modems Datasheet
CDM-600 Open Network Satellite Modem Installation and Operation Manual
FAST Authorization Code Entry for Enabling Software Options
Higher-Order Modulation and Turbo Coding Options for the CDM-600 Satellite Modem
Interference, Modems and Satellite Links
Modems and Corresonding Redundancy Switches
Modems and Corresonding Redundancy Switches
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