Comtech EF Data CDM-600/600L - Manual (Page 29)

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Chapter 1. INTRODUCTION
1.1 Overview
The CDM-600/600L Open Network Satellite Modem is intended for both Intelsat and closed
network applications. Apart from the IF frequency band, the two modems are essentially
identical: The CDM-600L (Figure 1-1) operates on the L-Band frequency, while the CDM-600 is
the 70/140 MHz IF version of the same modem.
Figure 1-1. CDM-600/600L Open Network Satellite Modem (CDM-600L shown)
1.1.1 Standard Features
The CDM-600/600L provides a wealth of standard features which go far beyond the basic requirements
of the Intelsat specifications:
• Low rate variable data rates – 2.4 kbps to 5.0 Mbps
• Mid-rate variable data rates – 2.4 kbps to 10.0 Mbps
• High-rate variable data rates – 2.4 kbps to 20.0 Mbps
• Selectable 50Ω / 75Ω IF port impedance (CDM-600)
• Asymmetric Loop Timing
• Modulation Types – BPSK, QPSK, and OQPSK
• Embedded Distant-end Monitor and Control (EDMAC) (see Note)
• Automatic Uplink Power Control (AUPC)
• Firmware – Flash Upgrading
• 1:1 and 1:10 redundancy switch compatibility