INTRODUCTION
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
20 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.
FEATURES
• CDM-600: 50 to 90 or 100 to 180 MHz IF range CDM-600L: 950 to
2000 MHz IF range
• Fast acquisition demodulator (± 32 kHz acquisition range, 64
kbps, Rate 1/2 QPSK: 1 sec average)
• BPSK, QPSK, OQPSK, 8-PSK, 16-QAM modulation types
• Patented 8-QAM for LDPC
• Data rate range from 2.4 kbps to 20 Mbps
• Forward Error Correction choices include Turbo Product Coding
(IESS-315 compliant), Viterbi, Sequential, Reed-Solomon, LDPC and
TCM
• Intermediate Data Rate (IDR)
• Intelsat Business Services
• D&I++
• ESC++
• Automatic Uplink Power Control (AUPC)
• Embedded Distant-end Monitor and Control (EDMAC)
• Asymmetric Loop Timing
• CDM-600: 50 or 75 Ω, front panel selectable CDM-600L: Transmit 50
Ω, Receive 50 or 75 Ω, female Type N connector
• Open network compatible and backwards compatible with the
CDM-500/CDM-550, and CDM-550T
• Interoperable with SDM-300A, SDM-300L3 (CDM-600L only)
• 1:1 and 1:10 redundancy switch available APPLICATIONS
• Cellular Backhaul
• G.703 Trunking
TYPICAL USERS
• Satellite Service Providers
• Telecom Service Providers
• Broadcasters
• Offshore
• Enterprise
FEATURE ENHANCEMENTS
Enhancing 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 CODING
The 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:
• 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
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
(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. 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.