Modems
CDM-600 & CDM-600L Open
Network Satellite Modems
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 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.
FEATURES
• CDM-600: 50 to 90 or 100 to 180 MHz IF range
CDM-600L: 950 to 1950 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
• Data rate range from 2.4 kbps to 5 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 75Ω, front panel selectable
CDM-600L: Transmit 50Ω, Receive 50 or 75Ω,
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
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
A 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 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 (E
b
/N
o
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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