Comtech VIPERSAT CDM-600 and CDM-600L Digital Satellite Modem

The CDM-600 provides a cost-effective solution for today’s higher data rate satellite circuits, and will replace many older modems currently reaching the end of their life cycle. The CDM-600 is an Open Network modem, fully compliant with Intelsat IESS-308, 309, 310, 314, and 315 with data rates from 2.4 kbps to 20 Mbps. 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)
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. Full Drop and Insert functionality is available as an option. 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. .

The CDM-600 offers all traditional FEC methods and incorporates an optional Turbo Product Codec (TPC). TPC is a recent development in FEC techniques 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. 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 (from 5/16 through 7/8 and 0.95) with all modulation types from BPSK to 16-QAM. Comtech EF Data’s TPC solution is compliant with Intelsat IESS-315.

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

The CDM-600 Modem uses 70 MHz IF, while the CDM-600L uses L-band IF.

The CDM-600 and CDM-600L modems must be fitted with the CIM-25 module in order to be used in a Vipersat solution.

Satcom-Services and Comtech Vipersat Networks Inc. reserves the right to make changes to specifications of products described in these pages at any time without notice and without obligation to notify any person of such changes.


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