CDM-600 Satellite Modem Revision 7
Introduction MN/CDM600.IOM
1–3
1.1.2 Software – Flash Upgrading
The internal software is both powerful and flexible, permitting storage and retrieval of up
to 10 different modem configurations. The modem uses ‘flash memory’ technology
internally, and new firmware can be uploaded to the unit from an external PC. This
simplifies software upgrading, and updates can now be sent via the Internet, e-mail, or on
disk. The upgrade can be performed without opening the unit, by simply connecting the
modem to the serial port of a computer. Refer to Chapter 13 Flash Upgrading for
additional information.
1.1.3 Verification
The unit includes many test modes and loopbacks for rapid verification of the correct
functioning of the unit. Of particular note is the IF loopback, which permits the user to
perform a quick diagnostic test without having to disturb external cabling. During the
loopback, all of the receive configuration parameters are temporarily changed to match
those of the transmit side, and an internal RF switch connects the modulator output to the
demodulator input. When normal operation is again selected, all of the previous values
are restored.
1.1.4 Data Interfaces
The CDM-600 includes, as standard, a universal data interface that eliminates the need to
exchange interface cards for different applications. The interfaces offered include:
• EIA-422 (EIA530) DCE (at rates up to 10 Mbps)
• X.21 DTE and DCE (at rates up to 10 Mbps)
• V.35 DCE (at rates up to 10 Mbps)
• Synchronous EIA-232 DCE (at rates up to 300 kbps)
• G.703 E1, balanced and unbalanced
• G.703 T1, balanced
• G.703 E2, balanced and unbalanced
• G.703 T2, balanced
• Serial LVDS (at rates up to 20 Mbps)
• Dual Audio, 600Ω (produces a single 64 kbps IBS data stream)
• HSSI (optional with CIC-20 interface converter)